Theories of superior collicular and hippocampal function have remarkable similarities. Both structures have been repeatedly implicated in spatial and attentional behaviour and in inhibitory control of locomotion. Moreover, they share certain electrophysiological properties in their single unit responses and in the synchronous appearance and disappearance of slow wave activity. Both are phylogenetically old and the colliculus projects strongly to brainstem nuclei instrumental in the generation of theta rhythm in the hippocampal EECOn the other hand, close inspection of behavioural (...) and electrophysiological data reveals disparities. In particular, hippocampal processing mainly concerns stimulus ambiguity, contextual significance, and spatial relations or other subtle, higher order characteristics. This requires the use of largely preprocessed sensory information and mediation of poststimulus investigation. Although collicular activity must also be integrated with that of “higher” centres, its primary role in attention is more “peripheral” and specific in controlling orienting/localisation via eye and body movements toward egocentrically labelled spatial positions. In addition, the colliculus may exert a nonspecific influence in alerting higher centres to the imminence of information potentially worthy of focal attention. Nevertheless, it is noteworthy that collicular and hippocampal lesions produce deficits on similar tasks, although the type of deficit is usually different in each case. Functional overlap between hippocampus and colliculus is virtually certain vis-à-vis stimulus sampling, for example in the acquisition of information via vibrissal movements and visual scanning. In addition, insofar as stimulus significance is a factor in collicular orienting mechanisms, the hippocampus — cingulate – cortex — colliculus pathway may play a significant role, modulating collicular responsiveness and thus ensuring an attentional strategy appropriate to current requirements. A tentative “reciprocal loop” model is proposed which bridges physiological and behavioural levels of analysis and which would account for the observed degree and nature of functional overlap between the superior colliculus and hippocampus. (shrink)

Non-invasive neuroimaging in humans permits direct investigation of the potential role for mesodiencephalic structures in consciousness. Activity in the superior colliculus can be correlated with the contents of consciousness, but it can be also identified for stimuli of which the subject is unaware; and consciousness of some types of visual stimuli may not require the superior colliculus. (Published Online May 1 2007).

The superficial superior colliculus appears to be a primitive visual analyzer whose function has been taken over by the visual cortex, most completely in man. The phenomenon of blindsight shows that, although intact, the superior colliculus cannot by itself provide conscious perception in human patients. Is it possible that, in anencephalic children, it recovers the role it had in lower mammals? (Published Online May 1 2007).

Recordings of neuronal activity in the monkey superior colliculus (SC) suggest that the two apparently independent effects of a visual distractor on both temporal (latency) and spatial (metrics) saccade parameters may be the result of lateral interactions between subpopulations of saccade-related neurons located at different sites on the motor map of the superior colliculus. One subpopulation is activated during the planing and initiation of a saccade; the other is activated by the appearance of a distractor. The (...) inhibitory or facilitative nature of this interaction depends on the distance between the distractor and the target and is consistent with the complex pattern of intrinsic and commissural collicular connections. (shrink)

Consistent with the target article, recent evidence indicates that the superior colliculus (SC) is somehow involved in target selection. However, it is not yet known whether this function is inherent to the SC or inherited from its inputs, how the selection process occurs for different movements, or how target selection by the SC is related to covert selection (i.e., attention). (Published Online May 1 2007).

Blindsight is the term commonly used to describe visually guided behaviour elicited by a stimulus falling within the scotoma (blind area) caused by a lesion of the striate cortex. Such is normally held to be unconscious and to be mediated by subcortical pathways involving the superior colliculus. Blindsight is of considerable theoretical importance since it suggests that destriate man is more like destriate monkey than had been previously believed and also because it supports the classical notion of two (...) visual systems. It is also of potential clinical importance, since it has been claimed recently that systematic practice in blindsight can lead to the recovery of normal visual function in patients with cortical lesions. From a review of the literature it is concluded that all of the phenomena of blindsight can be attributed either to light scatter into unimpaired parts of the visual field or to residual vision resulting from spared striate cortex. The possible contribution f other factors is also considered. It is concluded that blindsight studies have generally failed to control for such nonblindsight interpretations partly because of poor methodology and partly because of difficulties in defining the term. (shrink)

Philologus, founded in 1846, is one of the oldest and most respected periodicals in the field of Classics. It publishes articles on Greek and Latin literature, historiography, philosophy, history of religion, linguistics, reception, and the history of scholarship. The journal aims to contribute to our understanding of Greco-Roman culture and its lasting influence on European civilization. The journal Philologus, conceived as a forum for discussion among different methodological approaches to the study of ancient texts and their reception, publishes original scholarly (...) contributions with a strong international focus. Publications languages are: German, English, Italian, French. As of 2014 the publication of supplementary volumes will be resumed. The series Philologus. Supplemente / Philologus. Supplementary Volumes will publish monographs and edited volumes pertaining to all aspects of the study of ancient literature and its reception, with a special focus on topics concerning literary theory, philosophy and the history of scholarship from an interdisciplinary perspective. (shrink)

In a text written during his stay in Paris, Leibniz, to deny ontological reality to relations, employs an argument well known to the medieval thinkers and which later would be revived by Francis H. Bradley. If one assumes that relations are real and that a relation links any property to a subject – so runs the argument – then one falls prey to an infinite regress. Leibniz seems to be well aware of the consequences that this argument has for his (...) own metaphysical views, where the relation of inherence (‘inesse’) plays such a central role. Thus, he attempts first to interpret the relation of inherence as something ‘metaphoric’, originating from our ‘spatial way’ of looking at the surrounding world; and then he tries to reduce it to the part-whole relation which clearly he considers weaker, from the ontological point of view, than that of ‘being in’. (shrink)

In a text written during his stay in Paris, Leibniz, to deny ontological reality to relations, employs an argument well known to the medieval thinkers and which later would be revived by Francis H. Bradley. If one assumes that relations are real and that a relation links any property to a subject – so runs the argument – then one falls prey to an infinite regress. Leibniz seems to be well aware of the consequences that this argument has for his (...) own metaphysical views, where the relation of inherence plays such a central role. Thus, he attempts first to interpret the relation of inherence as something ‘metaphoric’, originating from our ‘spatial way’ of looking at the surrounding world; and then he tries to reduce it to the part-whole relation which clearly he considers weaker, from the ontological point of view, than that of ‘being in’. (shrink)

Objective Apeiron was founded in 1966 and has developed into one of the oldest and most distinguished journals dedicated to the study of ancient philosophy, ancient science, and, in particular, of problems that concern both fields. Apeiron is committed to publishing high-quality research papers in these areas of ancient Greco-Roman intellectual history; it also welcomes submission of articles dealing with the reception of ancient philosophical and scientific ideas in the later western tradition. The journal appears quarterly. Articles are peer-reviewed on (...) a double-blind basis. Topics ancient philosophy ancient science reception of ancient philosophical and scientific ideas in the later western tradition Article formats Original Articles. (shrink)

The “top-down” and “bottom-up” approaches have been thought to exhaust the possibilities for doing cognitive neuroscience. We argue that neither approach is likely to succeed in providing a theory that enables us to understand how cognition is achieved in biological creatures like ourselves. We consider a promising third way of doing cognitive neuroscience, what might be called the “neural dynamic systems” approach, that construes cognitive neuroscience as an autonomous explanatory endeavor, aiming to characterize in its own terms the states and (...) processes responsible for brain-based cognition. We sketch the basic motivation for the approach, describe a particular version of the approach, so-called ‘Dynamic Causal Modeling’ (DCM), and consider a concrete example of DCM. This third way, we argue, has the potential to avoid the problems that afflict the other two approaches. (shrink)

Recent studies on neural pathways in a broad spectrum of vertebrates suggest that, in addition to migration and an increase in the number of certain select neurons, a significant aspect of neural evolution is a “parcellation” (segregation-isolation) process that involves the loss of selected connections by the new aggregates. A similar process occurs during ontogenetic development. These findings suggest that in many neuronal systems axons do not invade unknown territories during evolutionary or ontogenetic development but follow in their ancestors' paths (...) to their ancestral targets; if the connection is later lost, it reflects the specialization of the circuitry.The pattern of interspecific variability suggests (1) that overlap of circuits is a more common feature in primitive (generalized) than in specialized brain organizations and (2) that most projections, such as the retinal, thalamotelencephalic, corticotectal, and tectal efferent ones, were bilateral in the primitive condition. Specialization of these systems in some vertebrate groups has involved the selective loss of connections, resulting in greater isolation of functions. The parcellation process may also play an important role in cell diversification.The parcellation process as described here is thought to be one of several underlying mechanisms of evolutionary and ontogenetic differentiation. (shrink)

Subcortical substrates for behavioural integration include the fore/midbrain nuclei of the basal ganglia and the hindbrain medial reticular formation. The midbrain superior colliculus requires basal ganglia disinhibition in order to generate orienting movements. The colliculus should therefore be seen as one of many competitors vying for control of the body's effector systems with the basal ganglia acting as the key arbiter. (Published Online May 1 2007).

It has been shown that visual awareness in the blind hemifield of hemianopic cats that have undergone unilateral ablations of visual cortex can be restored by sectioning the commissure of the superior colliculus or by destroying a portion of the substantia nigra contralateral to the cortical lesion (the Sprague effect). We propose that the visual awareness that is recovered is due to synchronized oscillatory activities in the superior colliculus ipsilateral to the cortical lesion. These oscillatory activities (...) are normally partially suppressed by the inhibitory, GABAergic contralateral nigrotectal projection, and the destruction of the substantia nigra, or the sectioning of the collicular commissure, disinhibits the collicular neurons, causing an increase in the extent of oscillatory activity and/or synchronization between activities at different sites. This increase in the oscillatory and synchronized character is sufficient for the activities to give rise to visual awareness. We argue that in rodents and lower vertebrates, normal visual awareness is partly due to synchronized oscillatory activities in the optic tectum and partly due to similar activities in visual cortex. It is only in carnivores and primates that visual awareness is wholly due to cortical activities. Based on von Baerian recapitulation theory, we propose that, even in humans, there is a period in early infancy when visual awareness is partially due to activities in the superior colliculus, but that this awareness gradually disappears as the nigrotectal projection matures. (shrink)

Recent studies showing that pontine burst cells carry a monocular code for rapid eye movements raise questions about the organisation of signals at more central levels. Evidence that the superior colliculus may also be involved in the coding of movements in depth is reviewed. Recent work showing that the global effect is a property of refixations in 3-D space is another indication that the oculomotor systems for direction and depth are centrally coupled.

Barsalou has recently argued against the strategy of identifying amodal neural representations by using their cross-modal responses (i.e., their responses to stimuli from different modalities). I agree that there are indeed modal structures that satisfy this “cross-modal response” criterion (CM), such as distributed and conjunctive modal representations. However, I argue that we can distinguish between modal and amodal structures by looking into differences in their cross-modal responses. A component of a distributed cell assembly can be considered unimodal because its responses (...) to stimuli from a given modality are stable, whereas its responses to stimuli from any other modality are not (i.e., these are lost within a short time, plausibly as a result of cell assembly dynamics). In turn, conjunctive modal representations, such as superior colliculus cells in charge of sensory integration, are multimodal because they have a stable response to stimuli from different modalities. Finally, some prefrontal cells constitute amodal representations because they exhibit what has been called ‘adaptive coding’. This implies that their responses to stimuli from any given modality can be lost when the context and task conditions are modified. We cannot assign them a modality because they have no stable relation with any input type. (shrink)

Findlay & Walker's target article proposes a model of saccade generation related to the underlying neuroscience. A problem with such models is the number of brain areas showing oculomotor function. Traditionally, therefore, models have been partial, usually concentrating either on cortex (Liu et al. 1997; Pierrot Deseilligny et al. 1995) or on the superior colliculus and brainstem circuits (Moschovakis 1994; Van Gisbergen et al. 1993). Findlay & Walker's model attempts to integrate both levels within a functional framework. To (...) some extent it falls between two stools. For example, some functions that the authors ascribe to subcortical regions may actually occur at the cortical level. (shrink)

The Findlay & Walker target article emphasizes the role of the target-nonspecific “fixate” system while downplaying the role of the target-specific “move” system in determining saccade latency. We agree that disengagement of the fixate system is responsible for the target-nonspecific latency reduction associated with the gap effect. However, high target predictability and extensive training at a target location can also result in latency reductions, the culmination of this being express saccades. The target-specificity associated with the latter forms of latency reduction (...) implicate a mechanism involving the move system. Recently discovered neurophysiological correlates underlying these behavioural phenomena reside in the superior colliculus. (shrink)

The posterior parietal cortex and frontal eye field contain maps of visual salience on which the decision to choose a saccade may be based. However, an averaging express saccade is not represented by a victorious unimodal representation in the superior colliculus. Normalization as described by Findlay & Walker is not necessary for the generation of saccades.

A broad range of behavior is associated with crossmodal perception in the arts. Philosophical explanations of crossmodal perception often make reference to neuroscientific discussions of multisensory integration in selective attention. This research demonstrates that superior colliculus plays a regulative role in attention, integrating unique modality specific visual, auditory, and somatosensory spatial maps into a common spatial framework for action, and that motor skill, emotional salience, and semantic salience contribute to the integration of auditory, visual, and somatosensory information in (...) ordinary perceptual contexts. I present a model for multisensory integration in our engagement with artworks derived from a diagnostic recognition framework for object recognition and a biased competition model for selective attention. The proposed model attributes a role to superior colliculus in a broader fronto-parietal attentional network that integrates sensory information, primes perceptual systems to the expectation of stimulus features salient to particular sensorimotor or cognitive tasks at particular locations, and inhibits the perception of task irrelevant distracters. I argue that this model demonstrates that crossmodal effects are the rule not the exception in perception and discuss ways in which it explains a range of crossmodal effects in our engagement with pictures, dance, and musical performances. (shrink)

This paper outlines the functional capacities of a novel scheme for cognitive representation and computation, and it explores the possible implementation of this scheme in the massively parallel organization of the empirical brain. The suggestion is that the brain represents reality by means of positions in suitably constitutes phase spaces; and the brain performs computations on these representations by means of coordinate transformations from one phase space to another. This scheme may be implemented in the brain in two distinct forms: (...) (1) as a phase-space sandwich, which may explain certain laminar structures, such as cerebral cortex and the superior colliculus; and (2) as a neural matrix, which may explain other structures, such as the beautifully orthogonal architecture of the cerebellum. (shrink)

Suppose that A and B are two kinds of goods such that more of each is better than less. A is strongly superior to B if any amount of A is better than any amount of B. It is weakly superior to B if some amount of A is better than any amount of B. There are many examples of these relations in the literature, sometimes under the labels “higher goods” and “discontinuity.” The chapter gives a precise and (...) generalized statement of Strong and Weak Superiority and discusses different ways in which these relations can be relevant to the aggregation of welfare. It also proves a number of general results. One of the results gives rise to a dilemma: It can be used as an argument against the existence of value superiority or, alternatively, as an argument against the view that superiority entails a radical difference in value. (shrink)

In this thoroughly researched but accessibly written book, the respected scholar-monk Bhikkhu Anālayo explores-and sharply criticizes-four examples of what he terms "superiority conceit" in Buddhism: the androcentric idea that women are not suitable for monastic roles and less capable of becoming advanced bodhisattvas the Mahayana notion that those who don't aspire to become bodhisattvas are inferior practitioners the Theravada belief that theirs is the truest, most original expression of the Buddha's teaching the Secular Buddhist opinion that Buddhism is best practiced (...) divorced of ritual and dogma Armed with his rigorous examination of the canonical records, Ven. Anālayo challenges the scriptural basis for these conceits and points out that adhering to such notions of superiority is not, after all, conducive to practice. "It is by diminishing ego, letting go of arrogance, and abandoning conceit that one becomes a better Buddhist," he reminds us, "no matter what tradition one may follow.". (shrink)

In this article, I consider the standard interpretation of the superiority theory of humor attributed to Plato, Aristotle, and Hobbes, according to which the theory allegedly places feelings of superiority at the center of humor and comic amusement. The view that feelings of superiority are at the heart of all comic amusement is wildly implausible. Therefore textual evidence for the interpretation of Plato, Aristotle, or Hobbes as offering the superiority theory as an essentialist theory of humor is worth careful consideration. (...) Through textual analysis I argue that not one of these three philosophers defends an essentialist theory of comic amusement. I also discuss the way various theories of humor relate to one another and the proper place of a superiority theory in humor theory in light of my analysis. (shrink)

Early feminist or pro-woman works often combine the claim that the rational souls of men and women are the same with an argument for the superiority of women. This article considers two such works, Lucrezia Marinella's The Nobility and Excellence of Women and the Defects and Vices of Men (Venice, 1601 [1999]) and Marguerite Buffet's In Praise of Illustrious Learned Women, both Ancient and Modern (Paris, 1668), in order to show the continuities and distinctive features of feminist arguments for superiority, (...) to emphasize the differences in the conceptions of reason and physiology that distinguish them, and to demonstrate that claims of superiority persisted even as those defending women's worth began to adopt egalitarian positions. (shrink)

Suppose one sets up a sequence of less and less valuable objects such that each object in the sequence is only marginally worse than its immediate predecessor. Could one in this way arrive at something that is dramatically inferior to the point of departure? It has been claimed that if there is a radical value difference between the objects at each end of the sequence, then at some point there must be a corresponding radical difference between the adjacent elements. The (...) underlying picture seems to be that a radical gap cannot be scaled by a series of steps, if none of the steps itself is radical. We show that this picture is incorrect on a stronger interpretation of value superiority, but correct on a weaker one. Thus, the conclusion we reach is that, in some sense at least, abrupt breaks in such decreasing sequences cannot be avoided, but that such unavoidable breaks are less drastic than has been suggested. In an appendix written by John Broome and Wlodek Rabinowicz, the distinction between two kinds of value superiority is extended from objects to their attributes. (shrink)

Suppose one sets up a sequence of less and less valuable objects such that each object in the sequence is only marginally worse than its immediate predecessor. Could one in this way arrive at something that is dramatically inferior to the point of departure? It has been claimed that if there is a radical value difference between the objects at each end of the sequence, then at some point there must be a corresponding radical difference between the adjacent elements. The (...) underlying picture seems to be that a radical gap cannot be scaled by a series of steps, if none of the steps itself is radical. We show that this picture is incorrect on a stronger interpretation of value superiority, but correct on a weaker one. Thus, the conclusion we reach is that, in some sense at least, abrupt breaks in such decreasing sequences cannot be avoided, but that such unavoidable breaks are less drastic than has been suggested. In an appendix written by John Broome and Wlodek Rabinowicz, the distinction between two kinds of value superiority is extended from objects to their attributes. (shrink)

James Griffin has considered a form of superiority in value that is weaker than lexical priority as a possible remedy to the Repugnant Conclusion. In this article, I demonstrate that, in a context where value is additive, this weaker form collapses into the stronger form of superiority. And in a context where value is non-additive, weak superiority does not amount to a radical value difference at all. These results are applied on one of Larry Temkin's cases against transitivity. I demonstrate (...) that Temkin appeals to two conflicting notions of aggregation. I then spell out the consequences of these results for different interpretations of Griffin's suggestion regarding population ethics. None of them comes out very successful, but perhaps they nevertheless retain some interest. (shrink)

Resumo: A educação, a superior em particular, tem sido uma questão central nas políticas do Estado em Angola. E como compromisso, o Estado angolano tem-na definida como bem-público, o que implica uma série de medidas relacionadas ao seu acesso, seus processos de gestão e também os mecanismos de financiamento. Como resultado das disputas ideológicas na esfera do Estado, e também a emergência da economia de mercado em Angola, a condição de bem-público da educação é capturada pelos agentes do mercado (...) que adentram a esfera da educação. A emergência dos empresários da educação, bem como as demandas do mercado de trabalho e as políticas de carreiras transformaram a educação numa questão que supera as agendas públicas dos governos. Neste texto, vamos relatar a realidade proporcionada pelas políticas da educação superior na esfera do Estado. Compreendemos que o Estado é colocado diante do desafio de salvaguardar a condição de bem público através da regulação do sector e seus processos, por outro lado, é impelido pelas dinâmicas dos grupos hegemónicos nas esferas políticas e económicas, a condescender com a privatização da educação. Palavras-chave: Educação Superior; Bem-Público; Ideologia; Mercado. Higher Education in Angola: education as public good and the market challenges Abstract: Education, higher education in particular, has been at the core of the Angolan State policies. As a state commitment, education is defined as public good, which implies a set of measures related to its access, management processes, and financing mechanisms. Due to the ideological disputes within the state, as well as the emergence of the market, the ideal of education as public good is captured by the market agents who entered the education sphere. The emerge of the education entrepreneurship, also the labor market demands, and job career policies turned education into an issue beyond the government agenda. In this text, we relate the reality set up by the government education policies. It is our understanding that the state faces the challenge of safeguarding the public-good by regulating the sector, on the other hand, is impelled by the hegemonic groups to consent the privatization of education. Key-Words: Higher Education; Commoonweal; Public Good; Ideology; Market. L´ Enseignement supérieur angolais : l'éducation en tant que bien public face aux défis du marché Résumé : L'éducation, l'enseignement supérieur en particulier, a longtemps été au cœur des politiques de l'État angolais. En tant qu'engagement, l'État angolais définit l´éducation comme un bien public, ce qui implique la mise en place d´un ensemble de mesures liées à son accès, à ses processus de gestion ainsi qu´à ses mécanismes de financement. En raison des conflits idéologiques au sein de l'État ainsi que de l'émergence de l´économie de marché en Angola, l'idéal de l'éducation en tant que bien public est pris en compte par les agents du marché qui investissent dans le domaine. L'émergence de l'entrepreneuriat dans l'éducation, ainsi que les exigences du marché du travail et les politiques de carrière professionnelle ont fait de l'éducation une question qui va au-delà de l'agenda du gouvernement. Dans ce texte, nous présenterons la réalité proporcionnée par les politiques éducatives gouvernementales puisque, nous comprenons que l'État est confronté au défi de sauvegarder le bien public en réglementant le secteur d´une part et de l'autre, il est poussé par les groupes hégémoniques appartenant à la sphère politique et économique à consentir à la privatisation de l'éducation. Mots-clés: Enseignement Supérieur; Bien Public; Idéologie; Marché. Data de registro: 29/05/2023 Data de aceite: 26/10/2023. (shrink)

The meshed control theory assumes that cognitive control and automatic processes work together in the natural attention of experts for superior performance. However, the methods adopted by previous studies limit their capacity to provide in-depth information on the neuromotor processes. This experiment tested the theory with an alternative approach. Twelve skilled golfers were recruited to perform a putting task under three conditions: (1) normal condition, with no focus instruction (NC), (2) external focus of attention condition (EC), and (3) internal (...) focus of attention condition (IC). Four blocks of 10 putts each were performed under each condition. The putting success rate and accuracy were measured and electroencephalographies (EEGs) were recorded. The behavioral results showed that the NC produced a higher putting success rate and accuracy than the EC and IC. The EEG data showed that the skilled golfers’ attentional processes in the NC initially resembled those in the EC and then moved toward those in the IC just before putting. This indicates a switch from more automatic processes to cognitive control processes while preparing to putt. The findings offer support for the meshed control theory and indicate the dynamic nature of neuromotor processes for the superior performance of athletes in challenging situations. (shrink)

La pandemia producida por el COVID-19 llevó a las instituciones educativas a suspender todo tipo de actividad presencial. La educación superior pasó a desarrollarse en contextos digitales, lo que supuso un rediseño en cuanto a los recursos, instrumentos, modos, estrategias de actuación y medidas a implementar en el proceso de enseñanza-aprendizaje. En este estudio se analiza, desde una mirada cualitativa, las visiones del estudiantado sobre la docencia universitaria en contextos de pandemia. Los resultados evidencian la perspectiva diferencial del alumnado,-entusiasta, (...) crítica, condescendiente y nostálgica- sobre la educacion superior, en atención a su experiencia universitaria, vivida en contextos de profunda excepcionalidad. (shrink)

A quick look at what is happening in the corporate world makes it clear that the stakeholder idea is alive, well, and flourishing; and the question now is not “if ” but “how” stakeholder theory will meet the challenges of its success. Does stakeholder theory’s “arrival” mean continued dynamism, refinement, and relevance, or stasis? How will superior stakeholder theory continue to develop? In light of these and related questions, the authors of these essays conducted an ongoing dialogue on the (...) current state and future of stakeholder thinking. Beginning with a review of research and theory that has developed since the major stakeholder theorizing efforts of the 1990s, the authors individually offer their perspectives on the key issues relevant today to stakeholder thinking, and to suggest possible approaches that might lead toward and enable the continuing development of superior stakeholder theory. (shrink)