Based on content externalism, the question of whether self-knowledge is authoritative or not has launched a real controversy in the philosophy of mind. Boghossian proposed slow switching argument in defense of incompatibility of the two views. This argument has been criticized by some philosophers through different approaches. Vahid is one of them. He claimed that Boghossian's argument appeals to some controversial assumptions without which it cannot achieve its conclusion. In this article, I criticize Vahid's response to slow (...) switching argument and show that self-knowledge in Vahid's response differs in having authority and therefore in function from that of Boghossian. (shrink)

Recent discussions of externalism about mental content have been dominated by the question whether it undermines the intuitively plausible idea that we have knowledge of the contents of our thoughts. In this article I focus on one main line of reasoning (the so-called 'slow switching argument') for the thesis that externalism and self-knowledge are incompatible. After criticizing a number of influential responses to the argument, I set out to explain why it fails. It will be claimed that the (...) argument trades on an ambiguity, and that only by incorporating certain controversial assumptions does it stand a chance of establishing its conclusion. Finally, drawing on an analogy with Benacerraf's challenge to Platonism, I shall offer some reasons as to why the slow switching argument fails to reveal the real source of tension between externalism and privileged self-knowledge. (shrink)

The present paper has three aims. The first and foremost aim is to introduce into philosophy of mind and related areas (philosophy of language, etc) a discussion of Slow Earth, an analogue to the classic Twin Earth scenario that features a difference from aboriginal Earth that hinges on time instead of the distribution of natural kinds. The second aim is to use Slow Earth to call into question the central lessons often alleged to flow from consideration of Twin (...) Earth, lessons having to do with relations of minds to spatially definable boundaries of bodies such as skin or skull. The third aim is to suggest a puzzle for adherents of cognitive content externalism having to do with the metaphysical requirements on slow-switching, a hypothetical process whereby changes in the relations between subjects and their environments are followed by gradual changes in cognitive contents. (shrink)

Semantic externalism holds that the content of at least some of our thoughts is partly constituted by external factors. Accordingly, it leads to the unintuitive consequence that we must then often be mistaken in what we are thinking, and any kind of claim of privileged access must be given up. Those who deny that semantic externalists can retain any account of self-knowledge are ‘incompatibilists’, while those who defend the compatibility of self-knowledge with semantic externalism are ‘compatibilists’. This paper examines the (...) claim of compatibilism, focusing on Burge’s “Slow Switching Argument” and Boghossian’s “Objection of Relevant Alternatives”. I argue that compatibilism is false, and that semantic externalism is incompatible with self-knowledge. (shrink)

One of the main arguments intended to show that content externalism undermines the privileged access thesis is the ‘slow switching argument’, originally proposed by Boghossian. In this argument, it is supposed that a subject is unknowingly switched back and forth between Earth and Twin Earth: then it is claimed that, given externalism, when the subject is on Earth thinking that water is wet, he cannot know the content of his thought a priori, for he cannot, by mere reflection, (...) rule out the relevant alternative hypothesis that he is on Twin Earth thinking that twater is wet. One of the controversies surrounding this argument stems from the fact that it is not clear which epistemological principle underlies it. Here, I examine two suggestions made in the literature as to what that underlying principle might be. I argue that neither of these suggested principles is plausible, and thus that the slow switching argument never gets off the ground. (shrink)

I here argue against the viability of Peter Ludlow’s modified version of Paul Boghossian’s argument for the incompatibility of semantic externalism and authoritative self-knowledge. Ludlow contends that slow switching is not merely actual but is, moreover, prevalent; it can occur whenever we shift between localized linguistic communities. It is therefore quite possible, he maintains, that we undergo unwitting shifts in our mental content on a regular basis. However, there is good reason to accept as plausible that despite their (...) prevalence we are in fact able to readily adapt to such switches, as well as to the shifts in mental content that accompany them. The prevalence of slow switching between linguistic communities does not then necessarily entail incompatibility after all. (shrink)

Shortcuts to goals are rewarded by faster attainment and punished by more frequent failure, so selection of the various kinds – heuristics, cached sequences (habits or macros), gut instincts – depends on reward history just like other kinds of choice. The speeds of shortcuts lie on continua along with speeds of deliberation, and these continua have no obvious separation points.

Our understanding of dual-process models of cognition may benefit from a consideration of language processing, as language comprehension involves fast and slow processes analogous to those used for reasoning. More specifically, De Neys's criticisms of the exclusivity assumption and the fast-to-slow switch mechanism are consistent with findings from the literature on the construction and revision of linguistic interpretations.

Participants were required to switch among randomly ordered tasks, and instructional cues were used to indicate which task to execute. In Experiments 1 and 2, the participants indicated their readiness for the task switch before they received the target stimulus; thus, each trial was associated with two primary dependent measures: (1) readiness time and (2) target reaction time. Slow readiness responses and instructions emphasizing high readiness were paradoxically accompanied by slow target reaction time. Moreover, the effect of task (...) switching on readiness time was an order of magnitude smaller then the (objectively estimated) duration required for task preparation (Experiment 3). The results strongly suggest that participants have little conscious awareness of their preparedness and challenge commonly accepted assumptions concerning the role of consciousness in cognitive control. (shrink)

A midbrain neural basis for the perceptualoscillations of binocular rivalry is suggestedon the basis of fMRI studies of rivalry andinferences from the properties of rivalry thatcannot be explained from the known propertiesof primary visual cortical (V1) neurons. Therivalry switch is proposed to activatehomologous areas of each cerebral hemispherealternately, by means of a bistable oscillatorcircuit that straddles the midline of theventral tegmentum. This bistable oscillatoroperates at the same slow rate that ischaracteristic of perceptual rivalryalternations. Whilst attempting to divert thepresent preoccupation (...) with cortical mechanismsfor rivalry, the new proposal integrates manycortical areas, in keeping with recent evidencethat binocular rivalry involves widespreadareas of the hemispheres. By linking rivalry tointerhemispheric switching mechanisms in thisway, the new proposal for the switch makes theprediction that binocular rivalry will besubject to high level influences such as moodand motivation. These predictions are beingfulfilled, with rivalry playing an increasingrole in the diagnosis and understanding if mooddisorders, schizophrenia and other psychiatricconditions. (shrink)

Human reasoning is often conceived as an interplay between a more intuitive and deliberate thought process. In the last 50 years, influential fast-and-slow dual-process models that capitalize on this distinction have been used to account for numerous phenomena – from logical reasoning biases, over prosocial behavior, to moral decision making. The present paper clarifies that despite the popularity, critical assumptions are poorly conceived. My critique focuses on two interconnected foundational issues: the exclusivity and switch feature. The exclusivity feature refers (...) to the tendency to conceive intuition and deliberation as generating unique responses such that one type of response is assumed to be beyond the capability of the fast-intuitive processing mode. I review the empirical evidence in key fields and show that there is no solid ground for such exclusivity. The switch feature concerns the mechanism by which a reasoner can decide to shift between more intuitive and deliberate processing. I present an overview of leading switch accounts and show that they are conceptually problematic – precisely because they presuppose exclusivity. I build on these insights to sketch the groundwork for a more viable dual-process architecture and illustrate how it can set a new research agenda to advance the field in the coming years. (shrink)

This article reports an interesting link between the psychophysical property of intentional control of perceptual switching and the underlying neural activities. First, we revealed that the timing of perceptual switching for a dynamical dot quartet can be controlled by the observers' intention, without eye movement. However, there is a clear limitation to this control, such that each animation frame of the stimulus must be presented for a sufficiently long time length; in other words, the frequency of the stimulus (...) alternation must be sufficiently slow for the control. The typical stimulus onset asynchrony for a 50% level of success was about 275 ms for an average of 10 observers. On the basis of psychophysical property, we designed three experiments for investigating the neural process with a magnetoencephalography. They revealed that: (1) a peak component occurring about 300 ms after a reversal was stronger when the direction of perceived motion was switched intentionally than when it was not switched, and (2) neural components about 30–40 ms and 240–250 ms after the reversal of the stimulus animation were stronger when perception was altered intentionally than when it was switched unintentionally. The 300 ms component is consistent with a previous study about passive perceptual switching (Struber and Herrmann [2002]: Cogn Brain Res 14:370–382), but the intentional effect was seemed to be a different component from the well-known P300 component. (shrink)

In this paper, I challenge a widely presupposed principle in the epistemology of inference. The principle, (Validity Requirement), is this: S’s (purportedly deductive) reasoning, R, from warranted premise-beliefs provides (conditional) warrant for S’s belief in its conclusion only if R is valid. I argue against (Validity Requirement) from two prominent assumptions in the philosophy of mind: that the cognitive competencies that constitute reasoning are fallible, and that the attitudes operative in reasoning are anti-individualistically individuated. Indeed, my discussion will amount to (...) a defence of anti-individualism against a novel ‘slow-switch’ argument against it. This argument contra anti-individualism has it that given anti-individualism and certain auxiliary assumptions, A, a switched reasoner may, in certain slow-switch circumstances, C, reason invalidly by equivocating concepts. More specifically: -/- (Valid 0): Peter is in circumstances C, and auxiliary assumptions, A, hold.(Valid 1): If Peter is in circumstances C, and auxiliary assumptions A hold, then (if the attitudes operative in Peter’s reasoning R are anti-individualistically individuated, then R is not valid). (Valid 2): Peter’s reasoning, R, generates warrant for the conclusion-belief. (Valid 3): Peter’s reasoning, R, generates warrant for the conclusion-belief only if the reasoning, R, is valid. (Valid 4): So, the attitudes operative in Peter’s reasoning R are not anti-individualistically individuated. -/- The argument involves weaker premises than those of familiar slow-switch arguments against anti-individualism. In particular, it requires only that the reasoning be de facto valid. This assumption is much weaker than the requirement that the validity of the reasoning be ‘transparent’ to the reasoner. Indeed, (Valid 3) is simply an instance of (Validity Requirement). However, I argue that anti-individualism and (Valid 0)–(Valid 2) should be upheld at the expense of (Valid 3). In consequence, (Validity Requirement) stands in need of restriction. Thus, I argue for a surprising result in the epistemology of inference from widely accepted assumptions in the philosophy of mind. (shrink)

In the last twenty-five years, several authors have raised problems to the thesis that privileged self-knowledge is compatible with content externalism. In particular, the 'slow-switching' argument, which was originally put forth by Paul Boghossian (1989), aims to show that there is no satisfactory account of how we can have privileged knowledge about our own thoughts given content externalism. Though many philosophers have found ways to block the argument, no one has worried to address a major worry that Boghossian (...) had when he presented the argument, which is to understand under which conditions privileged self-knowledge is possible given content externalism. In this paper, I offer a diagnosis of why the slow-switching argument fails and I show how the diagnosis enables us to provide a partial response to Boghossian's worry. (shrink)

[Michael Tye] Externalism about thought contents has received enormous attention in the philosophical literature over the past fifteen years or so, and it is now the established view. There has been very little discussion, however, of whether memory contents are themselves susceptible to an externalist treatment. In this paper, I argue that anyone who is sympathetic to Twin Earth thought experiments for externalism with respect to certain thoughts should endorse externalism with respect to certain memories. /// [Jane Heal] Tye claims (...) that an externalist should say that memory content invoking natural kind concepts floats free of the setting where the memory is laid down and is at later times determined by the context in which the memory is revived. His argument assumes the existence of 'slow switching' of the meaning of natural kind terms when a person is transported from Earth to Twin Earth. But proper understanding of natural kind terms suggests that slow switching is likely never to be completed. Hence the situation of a person unknowingly transported to Twin Earth is not that his memories switch content but rather that he gets two natural kinds confused. (shrink)

[Michael Tye] Externalism about thought contents has received enormous attention in the philosophical literature over the past fifteen years or so, and it is now the established view. There has been very little discussion, however, of whether memory contents are themselves susceptible to an externalist treatment. In this paper, I argue that anyone who is sympathetic to Twin Earth thought experiments for externalism with respect to certain thoughts should endorse externalism with respect to certain memories. /// [Jane Heal] Tye claims (...) that an externalist should say that memory content invoking natural kind concepts floats free of the setting where the memory is laid down and is at later times determined by the context in which the memory is revived. His argument assumes the existence of 'slow switching' of the meaning of natural kind terms when a person is transported from Earth to Twin Earth. But proper understanding of natural kind terms suggests that slow switching (contrary to what is often presupposed) is likely never to be completed. Hence the situation of a person unknowingly transported to Twin Earth is not that his memories switch content but rather that he gets two natural kinds confused. (shrink)

Sven Bernecker’s contribution to the ongoing revival in the philosophy of memory offers a consistent vision and analysis of propositional remembering, and covers a range of topics in analytic metaphysics and epistemology. Bernecker defends a methodological externalism, by which memory ‘must be analyzed from a third-person point of view’ (34): so even though conceptual analysis remains the primary method, the ‘linguistic intuitions’ that guide it ‘are not a priori but empirical working hypotheses’ (31). Given the central role of such intuitions (...) in Bernecker’s treatment of many briefly described thought experiments throughout the book, it is strange that he does not defend their use more explicitly in this early section on method, instead leaving it to a later footnote (147, n. 11) to say that ‘trying to defend the use of intuitions in the philosophy of memory would . . . take us too far afield’. Bernecker’s subtitle signals a restricted target audience: this is a book for those analytic philosophers who will enjoy long exegeses on Twin Earth, slow switching or quasi-memory. Psychological results on memory are cited, but only piecemeal, and interactive dialogue with scientific theory is not Bernecker’s aim. (shrink)

Reliabilism is invoked by a standard causal response to the slow switching argument for incompatibilism about mental content externalism and privileged access. Though the response in question is negative, in that it only establishes that, given such an epistemology, externalism does not rule privileged access out, the appeal to reliabilism involves an assumption about the reliability of introspection, an assumption that in turn grounds a simple argument for the positive conclusion that reliabilism itself implies privileged access. This paper (...) offers a two-part defense of that conclusion: the reliabilist account of privileged access is defended both againstarguments in favor of the rival content inheritance strategy and against an argument turning on empirical considerations concerning the individuation of the belief-producing process of introspection. (shrink)

Some worry that semantic externalism is incompatible with knowing by introspection what content your thoughts have. In this paper, I examine one primary argument for this incompatibilist worry, the slow-switch argument. Following Goldberg , I construe the argument as attacking the conjunction of externalism and “skeptic immune” knowledge of content, where such knowledge would persist in a skeptical context. Goldberg, following Burge :649–663, 1988), attempts to reclaim such knowledge for the externalist; however, I contend that all Burge-style accounts vindicate (...) that a subject can introspectively know that she is thinking that “water is wet.” They do not yet show how a subject can introspectively know what she is thinking—which is the distinctive type of knowing at issue in the slow-switch argument. Nonetheless, I subsequently amend the Burge-style view to illustrate how an externalist can introspectively “know-what” content her thought has, and know it in a skeptic immune manner, despite what the slow-switch argument may suggest. For one, I emphasize that “knowing what” can be ontologically non-committal . For another, following Boer and Lycan , I stress that “knowing what” is purpose-relative–and for at least some purposes, it seems possible for the externalist to “know what” content her thought has, even if skeptical hypotheses about XYZ are relevant. (shrink)

The first explicit argument for the incompatibility of externalism in the philosophy of mind and a priori self-knowledge is Boghossian’s discrimination argument. In this essay, I oppose the third premise of this argument, trying to show by means of a thought experiment that possessing the “twater thought” is not an alternative, a fortiori not a relevant alternative, to having the “water thought.” I then examine a modified version of Boghossian’s argument. The attempt is made to substantiate the claim that the (...) standard incompatibilist support for its second premise is untenable. Furthermore, a third Boghossian-style argument is rejected on the ground that either its second premise cannot be warranted in the way suggested by incompatibilists or its third premise is mistaken because having the “twater thought” instead of the “water thought” is not relevant. Finally, it is argued that the discrimination argument cannot be saved by invoking closure. The upshot of my discussion is that a compatibilist can dismiss Boghossian-style arguments for incompatibilism without having to deal with fundamental issues concerning self-knowledge and the nature of slow switching. (shrink)

This article presents a defense of “presentist externalism,” that is, the claim that memory contents are fixed by the environment and by the time at which a recollection takes place rather than by those at which the original mental state occurred. Its case is an instance of an argument to the best explanation. The author argues, firstly, that “presentist externalism” is the only version of content externalism that can stand up to both Boghossian’s memory and fallacy arguments. In slow (...) switching cases, inferences containing memory thoughts as premises are unsound or unsafe, but valid. The author contends, secondly, that the externalist must recognize the existence of wide mismemories besides wide forgetting and that only the presentist externalist can account for their existence. The author maintains, finally, that if the validity of an inference requires that all its premises and conclusion be evaluated in the same context, that in which the inference is made, then it is the present context that fixes the content and the concepts of memory rather than the past. (shrink)

According to Burge, it is not possible to commit brute errors in the process of critical reasoning. This thesis lies at the heart of Burge’s influential theory of self-knowledge. By appealing to a version of the slow-switching argument, this paper contends that Burge’s view is not compatible with his commitment to externalism about mental content. In particular, it is argued that accepting externalism opens up the possibility of brute errors in the process of critical reasoning.

Paul Boghossian's‘Memory Argument’allegedly shows, using the familiar slow‐switching scenario, that externalism and authoritative self‐knowledge are incompatible. The aim of this paper is to undermine the argument by examining two distinct externalist responses. I demonstrate that the Memory Argument equivocates on the notion of forgetting.

While slowness of movement is an obligatory characteristic of Parkinson’s disease (PD), there are conditions in which patients move uncharacteristically fast, attributed to deficient motor inhibition. Here we investigate deficient inhibition in an optimal sensory-motor integration framework, using a game in which subjects used a paddle to catch a virtual ball. Display of the ball was extinguished as soon as the catching movement started, segregating the task into a sensing and acting phase. We analyzed the behavior of 9 PD patients (...) (ON medication) and 10 age-matched controls (HC). The switching times (between sensing and acting phase) were compared to the predicted optimal switching time, based on the individual estimates of sensory and motor uncertainties. The comparison showed that deviation from predicted optimal switching times were similar between groups. However, PD patients showed a weaker correlation between variability in switching time and sensory-motor uncertainty, indicating a reduced propensity to generate exploratory behavior for optimizing goal-directed movements. Analysis of the movement kinematics revealed that PD patients, compared to controls, used a lower peak velocity of the paddle and intercepted the ball with greater velocity. Adjusting the trial duration to the time for the paddle to stop moving, we found that PD patients spent a smaller proportion of the trial duration for observing the ball. Altogether, the results do not show the premature movement initiation and truncated sensory processing that we predicted to ensue from deficient inhibition in PD. (shrink)

Responding to bivalent stimuli slows subsequent performance. In prospective memory research, prospective memory targets can be considered as bivalent stimuli because they typically involve features relevant for both the prospective memory task and the ongoing task. The purpose of this study was to investigate how responding to a prospective memory target slows subsequent performance. In two experiments, we embedded the prospective memory task in a task-switching paradigm and we manipulated the degree of task-set overlap between the prospective memory task (...) and the ongoing task. The results showed consistent after-effects of responding to prospective memory targets. The specific trajectory of the slowing depended on the amount of task-set overlap. These results demonstrate that responding to prospective memory targets results in after-effects, a so far neglected cost on ongoing task performance. (shrink)

Acquiring perceptual expertise is slow and effortful. However, untrained novices can accurately make difficult classification decisions by reformulating the task as similarity judgment. Given a query image and a set of reference images, individuals are asked to select the best matching reference. When references are suitably chosen, the procedure yields an implicit classification of the query image. To optimize reference selection, we develop and evaluate a predictive model of similarity-based choice. The model builds on existing psychological literature and accommodates (...) stochastic, dynamic shifts of attention among visual feature dimensions. We perform a series of human experiments with two stimulus types and nine classification tasks to validate the model and to demonstrate the model's potential to boost performance. Our system achieves high accuracy for participants who are naive as to the classification task, even when the classification task switches from trial to trial. (shrink)

Correspondence should be addressed to David A. Leopold [email protected] the viewing of certain patterns, widely known as ambiguous or puzzle figures, perception lapses into a sequence of spontaneous alternations, switching every few seconds between two or more visual interpretations of the stimulus. Although their nature and origin remain topics of debate, these stochastic switches are generally thought to be the automatic and inevitable consequence of viewing a pattern without a unique solution. We report here that in humans such perceptual (...) alternations can be slowed, and even brought to a standstill, if the visual stimulus is periodically removed from view. We also show, with a visual illusion, that this stabilizing effect hinges on perceptual disappearance rather than on actual removal of the stimulus. These findings indicate that uninterrupted subjective perception of an ambiguous pattern is required for the initiation of the brain-state changes underlying multistable vision.Visual perception involves coordination between sensory sampling of the world and active interpretation of the sensory data. Human perception of objects and scenes is normally stable and robust, but it falters when one is presented with patterns that are inherently ambiguous or contradictory. Under such conditions, vision lapses into a chain of continually alternating percepts, whereby a viable visual interpretation dominates for a few seconds and is then replaced by a rival interpretation. This multistable vision, or 'multistability', is thought to result from destabilization of fundamental visual mechanisms, and has offered valuable insights into how sensory patterns are actively organized and interpreted in the brain1, 2. Despite a great deal of recent research and interest in multistable perception, however, its neurophysiological underpinnings remain poorly understood. Physiological studies have suggested that disambiguation of ambiguous patterns. (shrink)

This chapter contains sections titled: References.

Two experiments used eyetracking during reading to examine the processing of the matrix verb following object and subject relative clauses. The experiments show that the processing of the matrix verb following an object relative is indeed slowed compared to the processing of the same verb following a subject relative. However, this difficulty is entirely eliminated if additional material intervenes between the object gap and the matrix verb. An explanation in terms of spillover processing is ruled out, suggesting that it is (...) the gap-matrix verb sequence that is itself responsible for the difficulty. We consider two accounts of this difficulty, one emphasizing the potential difficulty of rapidly switching between the sentential subject's thematic or syntactic role in the embedded clause and its role in the matrix clause, and one emphasizing the potential difficulty of performing two demanding memory retrievals in rapid succession. The present experiments also closely replicate the previous findings from eyetracking that the noun phrase and the verb within an object relative are both loci of processing difficulty, but that the former induces substantially greater difficulty. (shrink)

During recovery from psychosis (diagnosed as schizophrenia) things must often be done slower than normally expected. The tempo of the socially shared reality is often experienced as being too fast for the recovering person. We will describe how this impairment stems from the pre-reflective mental structure underlying psychosis and how it can be transferred into an active skill supporting recovery, often including social retreat. In this paper, co-written by a psychiatrist and a person experienced in psychosis (= participatory health research), (...) we will draw on personal experiences, (participatory) qualitative research and first-hand accounts for our arguments. We will sketch out the process and three crucial building blocks of recovery: laid-back situations, switch-off skills, places to talk. We will then describe the acquired skill of slowing-down as an amalgam of the building blocks ‘switch-off skill’ and ‘laid-back situation’, since slowing-down answers the situation in a laid-back manner and enforces a slow behavioral pace on it. While this might be okay in private and in some situations shared with others (i.e. during serene situations), it may be tantalizing for others in many everyday situations resulting in stigma or exclusion (i.e. during work). Slowing-down therefore challenges the surrounding others and demonstrates the necessity to synchronize private and public tempos. This is most challenging while living in two realities at once, being the second and often a long-lasting stage of recovery (stage of double realities). (shrink)

The distribution of cultural variants in a population is shaped by both neutral evolutionary dynamics and by selection pressures. The temporal dynamics of social network connectivity, that is, the order in which individuals in a population interact with each other, has been largely unexplored. In this paper, we investigate how, in a fully connected social network, connectivity dynamics, alone and in interaction with different cognitive biases, affect the evolution of cultural variants. Using agent‐based computer simulations, we manipulate population connectivity dynamics (...) (early, mid, and late full‐population connectivity); content bias, or a preference for high‐quality variants; coordination bias, or whether agents tend to use self‐produced variants (egocentric bias), or to switch to variants observed in others (allocentric bias); and memory size, or the number of items that agents can store in their memory. We show that connectivity dynamics affect the time‐course of variant spread, with lower connectivity slowing down convergence of the population onto a single cultural variant. We also show that, compared to a neutral evolutionary model, content bias accelerates convergence and amplifies the effects of connectivity dynamics, while larger memory size and coordination bias, especially egocentric bias, slow down convergence. Furthermore, connectivity dynamics affect the frequency of high‐quality variants (adaptiveness), with late connectivity populations showing bursts of rapid change in adaptiveness followed by periods of relatively slower change, and early connectivity populations following a single‐peak evolutionary dynamic. We evaluate our simulations against existing data collected from previous experiments and show how our model reproduces the empirical patterns of convergence. (shrink)

3. From. evolutionary. psychology. to. evolutionary. economics. 3.1 Shaken foundations Marshall's move from psychology to economics can be described as a slow shift rather than a sudden switch: Psychology seemed to hold out good ...

Objective: Caloric vestibular stimulation has traditionally been used as a tool for neurological diagnosis. More recently, however, it has been applied to a range of phenomena within the cognitive neurosciences. Here, we provide an overview of such studies and review our work using CVS to investigate the neural mechanisms of a visual phenomenon - binocular rivalry. We outline the interhemispheric switch model of rivalry supported by this work and its extension to a metarivalry model of interocular-grouping phenomena. In addition, studies (...) showing a slow rate of binocular rivalry in bipolar disorder are discussed, and the relationship between this finding and the interhemispheric switch model is described. We also review the effects of CVS in various clinical contexts, explain how the technique is performed and discuss methodological issues in its application. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Family, Friends, and Cancer:The Overwhelming Effects of Brain Cancer on a Child’s LifeLynne ScheumannOur son was diagnosed with a medulloblastoma at the old age of 13. The “lucky” part for him was his brain was almost fully developed at this age as opposed to most “medullo” patients. While this was a benefit to him it was also one of the hardest things for him.He went into surgery a highly (...) intelligent, active, and left handed boy and came out unable to move his left side, could barely speak, and very much aware of what he just lost. We, as a family, were totally unprepared for how globally this would [End Page 23] affect the rest of his life. As we spent time in the hospital I would look at the children with other types of cancer and see them walking and talking and doing their schoolwork and God forgive me I would be jealous. The fact that the cancer was in his brain, the part of his body that makes him who he is changed everything forever.He lost all of his friends because 13–year–old boys communicate best through physical activity and that was not an option for him. He still has the same personality and sense of humor, but he will not be the architect or engineer he once dreamed of being. Math, that was once so easy for him was now like a foreign language, never to be mastered again. He was able to graduate from High School and takes classes at our local Junior College in Computer Assisted Drafting, but he can only manage one or two classes a semester due to the fatigue he still suffers from.What I most worry about and wish I had been forewarned about is his long–term quality of life. Physically he has come such a long way from how he was after the resection. It was a very slow process in which the first year of rehab was slowed by the fact that one of the chemo agents causes peripheral neuropathy. He developed contractures in his ankles and needed serial casting and ankle–foot orthotics (AFO) not just on the left leg, but now the right. He was able to switch his handedness fairly easily and his left hand will always be of limited usefulness because of ataxia. I would get angry at him that he gave up on his left side so quickly until it was finally explained to me years later that the ataxia would never get better.As far as his walking ability goes he has come a long way. At first he was unable to walk and once he started rehab he went back to learning to crawl and progressed to a walker. The first time I saw him walk with the walker brought tears to my eyes. It was so much more of an event for me than when he took his first steps as a toddler. This was so much more hard fought. He never complained, just always did what was asked of him. It had to have been such hard work and also somewhat embarrassing, as he needed help to literally do everything for months. He progressed to a cane and about two years ago decided not to use that or his AFO’s. He now wears high top boots that substitute for the AFO’s but don’t make him appear disabled. Recently he decided there are times when he would be safer if he had his cane and purchased one that looks more like a hiking stick than a cane. I think he has come to terms with the fact that physically he is as good as he is going to get and works hard to maintain what he did regain. He has a trainer and goes to the gym on a regular basis with no prompting from us. I do not know if he realizes that as he ages things will be harder for him than the average person. I think in some way he is aware of that because he did decided to use the cane if safety is an issue.His... (shrink)

A key question in understanding microtubule dynamics is how GTP hydrolysis leads to catastrophe, the switch from slow growth to rapid shrinkage. We first provide a review of the experimental and modeling literature, and then present a new model of microtubule dynamics. We demonstrate that vectorial, random, and coupled hydrolysis mechanisms are not consistent with the dependence of catastrophe on tubulin concentration and show that, although single-protofilament models can explain many features of dynamics, they do not describe catastrophe as (...) a multistep process. Finally, we present a new combined (coupled plus random hydrolysis) multiple-protofilament model that is a simple, analytically solvable generalization of a single-protofilament model. This model accounts for the observed lifetimes of growing microtubules, the delay to catastrophe following dilution and describes catastrophe as a multistep process. (shrink)

There are a lot of expressions of pessimism these days about whether we can save the environment — and thereby ourselves. Some of this pessimism is self-serving, but most of it is quite genuine. People look at the trends, and they despair — or else go into denial. And those who despair will almost invariably point to one factor above all others — the threat of overpopulation. No matter whether we recycle all our waste, switch entirely to non-polluting energy sources, (...) sponge the skies of CFCs and greenhouse emissions, turn the deserts into gardens, and save the rainforests and the poor whales, all these gains will be washed away, these people say, by a surging tide of hungry hominids. My topic today, therefore, is the population boom. I want to consider the following question: is it inevitable that humanity must overwhelm itself in hungry babies? And I shall argue that the answer is a firm no — that while it is possible, and maybe even probable, that this catastrophe will happen, it is not inevitable. First, let’s take a clear-eyed look at some worrisome numbers, so that no one can say we are ignoring the facts. The world population clock has recently clicked over the six billion mark. I myself remember when it passed three billion. That was back around the time when the Beatles were driving teenie-boppers into hysterics; not all that long ago, really. We are currently adding nearly 90 million new hungry mouths every year, roughly three Canadas. Try to imagine the consequences if 90 million immigrants showed up at our borders in one year. In fact, the rate of increase has slowed down a little bit since the sixties and early seventies. Demographic experts are desperately trying to project on the basis of current trends, but the best they can do is to guess that world population will level out around ten billions or so, roughly around 2050. Will we all breathe a sigh of relief at that point, convinced that we have dodged the bullet? The problem is, of course, that it is not clear that we can continue, much longer, to provide even for the present world population, let alone a few billions more, given our current, highly wasteful methods of land use and resource extraction.. (shrink)

Studies based on the Rankine-Hugoniot relations have classified MHO shock waves as fast, switch-on, intermediate, switch-off, and slow. Any waves found in nature must also: possess steady-state structures and be stable in the presence of small-flow disturbances. In this monograph, Dr. Anderson examines these criteria in relation to plane shocks for which the collision frequency is large compared with cyclotron frequency. It contains a three-dimensional graphic representation of shock end states and presents an exact solution for the shock adiabatic (...) curve in a convenient form. An MIT Press Research Monograph. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:The Journal of Aesthetic Education 40.4 (2006) 21-38 MuseSearchJournalsThis JournalContents[Access article in PDF]Attractions to Violence and the Limits of EducationPaul DuncumThe effects of violent media fare upon young people are of great concern for educators and parents alike. Recently, some visual art educators have attempted to deal with the issue under the rubric of visual culture. 1 Adopting a critical position toward media violence, they have developed programs that (...) attempt to encourage in their students a view of citizenship that rejects an easy use of violence as the solution to resolving real life issues. In consideration of these attempts, this article examines media violence—not to comment upon the efforts of other art educators but to point to the exceptionally difficult, perhaps intractable, forces faced by any form of educational intervention.There can be no doubting that violence—defined as involving intentional physical harm—is highly popular in mass media entertainment and is increasingly gory. Tartar refers to Shakespeare's term "violent delights" 2 as an oxymoron, but delight in violence is exactly what many people appear to find. There appears to be no contradiction in Shakespeare's term—Shakespeare being no stranger to the idea—only a succinctly expressed observation of a particular taste that is both long-standing and nowadays evident in an increasingly visceral, violent mass media.This article addresses three questions: First, what is it about displays of violence that is so appealing? Where is the pleasure in watching bodies being blown apart? Where is the delight in watching barbarous torture, slaughter, and death? What is the lure, the attraction? Or, since one of my arguments will be that there are qualitatively different kinds of violence, is it more appropriate to ask what are the attractions of violence? Second, why are violent spectacles becoming more and more intense? Why are representations of violence becoming increasingly visceral? Third, what are we doing to ourselves by exposing ourselves to so much violent mass media? [End Page 21] What is the societal significance, the real world consequences, of being attracted to violent imagery?There are many kinds of violent spectacles. This article deals exclusively with violence in current mediated popular forms of entertainment, principally television, film, video, and computer games. It is not narrowly concerned with intentionally aestheticized images, for example, through the use of slow motion or when the soundtrack to images of mass slaughter switches from the mayhem on screen to the souring beauties of operatic singing. Such images are included here, but the article deals with an inclusive range of representations of violence typically found in some degree to be pleasurable by large sections of the public. Specifically, four kinds of violence are examined: comic, transgressive, retaliatory, and gratuitous.Of course, not everyone is attracted to violence, and most popular entertainment is not violent. 3 The best-selling video games are violent, 4 but violent films and videos are far outweighed by nonviolent fare, especially comedies. 5 Nevertheless, much media fare is violent. Studies conducted in the mid-to-late 1990s concluded that 60 percent of U.S. television programs contained violence, 40 percent of which was offered as humorous. 6 By the age of eighteen a child has seen around 200,000 violent acts on television, including 40,000 murders. 7 This includes 3 to 5 violent acts per hour on prime time and 20 to 25 per hour during Saturday morning cartoons.Sensory AttractionProfessional critics of film and video often talk about the aesthetic qualities of media violence—for example, of "balletic spectacle" and "orgiastic energy." 8 The New York Times film critic's review of Sam Peckinpah's 1969 film The Wild Bunch, a milestone in cinematic violence, wrote of the climatic massacre as a "blood ballet" and that the director "first highlights the horror of the mindless slaughter and then—and this is what really carries horror—makes it beautiful, almost abstract." 9 Virtually the same words were used recently by eminent U.S. film critic Roger Ebert with regard to Tarrantino's exceptionally... (shrink)