Sustained attention, a key cognitive skill that improves during childhood and adolescence, tends to be worse in some emotional and behavioural disorders. Sustained attention is typically studied in non-affective task contexts; here, we used a novel task to index performance in affective versus neutral contexts across adolescence (N = 465; ages 11–18). We asked whether: (i) performance would be worse in negative versus neutral task contexts; (ii) performance would improve with age; (iii) affective interference would be greater in younger adolescents; (...) (iv) adolescents at risk for depression and higher in anxiety would show overall worse performance; and (v) would show differential performance in negative contexts. Results indicated that participants performed more poorly in negative contexts and showed age-related performance improvements. Those at risk of depression performed more poorly than those at lower risk. However, there was no difference between groups as a result of affective context. For anxiety there was no difference in performance as a function of severity. However, those with higher anxiety showed less variance in their reaction times to negative stimuli than those with lower anxiety. One interpretation is that moderate levels of emotional arousal associated with anxiety make individuals less susceptible to the distracting effects of negative stimuli. (shrink)

Most cognitive psychology experiments evaluate models of human cognition using a relatively small, well-controlled set of stimuli. This approach stands in contrast to current work in neuroscience, perception, and computer vision, which have begun to focus on using large databases of natural images. We argue that natural images provide a powerful tool for characterizing the statistical environment in which people operate, for better evaluating psychological theories, and for bringing the insights of cognitive science closer to real applications. We discuss how (...) some of the challenges of using natural images as stimuli in experiments can be addressed through increased sample sizes, using representations from computer vision, and developing new experimental methods. Finally, we illustrate these points by summarizing recent work using large image databases to explore questions about human cognition in four different domains: modeling subjective randomness, defining a quantitative measure of representativeness, identifying prior knowledge used in word learning, and determining the structure of natural categories. (shrink)

Decades of psychological research have been aimed at modeling how people learn features and categories. The empirical validation of these theories is often based on artificial stimuli with simple representations. Recently, deep neural networks have reached or surpassed human accuracy on tasks such as identifying objects in natural images. These networks learn representations of real‐world stimuli that can potentially be leveraged to capture psychological representations. We find that state‐of‐the‐art object classification networks provide surprisingly accurate predictions of human similarity judgments for (...) natural images, but they fail to capture some of the structure represented by people. We show that a simple transformation that corrects these discrepancies can be obtained through convex optimization. We use the resulting representations to predict the difficulty of learning novel categories of natural images. Our results extend the scope of psychological experiments and computational modeling by enabling tractable use of large natural stimulus sets. (shrink)

In this book, T. L. Short places the notorious difficulties of Peirce's important writings in a more productive light, arguing that he wrote philosophy as a scientist, by framing conjectures intended to be refined or superseded in the inquiries they initiate. He argues also that Peirce held that the methods and metaphysics of modern science are amended as inquiry progresses, making metaphysics a branch of empirical knowledge. Additionally, Short shows that Peirce's scientific work expanded empiricism on empirical grounds, grounding his (...) phenomenology and subverting the fact/value dichotomy, and that he understood statistical explanations in nineteenth-century science as reintroducing the idea of final causation, now made empirical. Those innovations underlie Peirce's late ideas of a normative science and of philosophy as a branch of science. Short's rich and original study shows us how to read Peirce's writings and why they are worth reading. (shrink)

The tendency to test outcomes that are predicted by our current theory (the confirmation bias) is one of the best-known biases of human decision making. We prove that the confirmation bias is an optimal strategy for testing hypotheses when those hypotheses are deterministic, each making a single prediction about the next event in a sequence. Our proof applies for two normative standards commonly used for evaluating hypothesis testing: maximizing expected information gain and maximizing the probability of falsifying the current hypothesis. (...) This analysis rests on two assumptions: (a) that people predict the next event in a sequence in a way that is consistent with Bayesian inference; and (b) when testing hypotheses, people test the hypothesis to which they assign highest posterior probability. We present four behavioral experiments that support these assumptions, showing that a simple Bayesian model can capture people's predictions about numerical sequences (Experiments 1 and 2), and that we can alter the hypotheses that people choose to test by manipulating the prior probability of those hypotheses (Experiments 3 and 4). (shrink)

In this book, T. L. Short corrects widespread misconceptions of Peirce's theory of signs and demonstrates its relevance to contemporary analytic philosophy of language, mind and science. Peirce's theory of mind, naturalistic but nonreductive, bears on debates of Fodor and Millikan, among others. His theory of inquiry avoids foundationalism and subjectivism, while his account of reference anticipated views of Kripke and Putnam. Peirce's realism falls between 'internal' and 'metaphysical' realism and is more satisfactory than either. His pragmatism is not verificationism; (...) rather, it identifies meaning with potential growth of knowledge. Short distinguishes Peirce's mature theory of signs from his better-known but paradoxical early theory. He develops the mature theory systematically on the basis of Peirce's phenomenological categories and concept of final causation. The latter is distinguished from recent and similar views, such as Brandon's, and is shown to be grounded in forms of explanation adopted in modern science. (shrink)

How does the visual system recognize images of a novel object after a single observation despite possible variations in the viewpoint of that object relative to the observer? One possibility is comparing the image with a prototype for invariance over a relevant transformation set. However, invariance over rotations has proven difficult to analyze, because it applies to some objects but not others. We propose that the invariant transformations of an object are learned by incorporating prior expectations with real-world evidence. We (...) test this proposal by developing an ideal learner model for learning invariance that predicts better learning of orientation dependence when prior expectations about orientation are weak. This prediction was supported in two behavioral experiments, where participants learned the orientation dependence of novel images using feedback from solving arithmetic problems. (shrink)

This series will include monographs and collections of studies devoted to the investigation and exploration of knowledge, information, and data-processing systems of all kinds, no matter whether human, (other) animal, or machine. Its scope is intended to span the full range of interests from classical problems in the philosophy of mind and philosophical psychology through issues in cognitive psychology and sociobiology (concerning the mental capabilities of other species) to ideas related to artificial intelligence and computer science. While primary emphasis will (...) be placed upon theoretical, conceptual, and epistemological aspects of these problems and domains, empirical, experimental, and methodological studies will also appear from time to time. While most philosophers and psychologists tend to believe that the rise of cognitive psychology has occurred concomitant with the decline of operant psychology, Terry L. Smith contends that nothing could be further from the truth. He maintains that operant psychology has discovered (and continues to discover) reasonably well-confirmed causal principles of intentional behavior, which go beyond what cognitive psychology can provide, while cognitive psychology, in tum, has the potential to supply analyses (and explanations) that account for them. Smith thus advances a surprising but nonetheless illuminating perspective for appreciating the place of operant conditioning within the discipline of psychology in this rich and fascinating work. J. H. F. (shrink)

My purpose in what follows is not so much to defend the basic principle of utilitarianism as to indicate the form of it which seems most promising as a basic moral and political position. I shall take the principle of utility as offering a criterion for two different sorts of evaluation: first, the merits of acts of government, social policies, and social institutions, and secondly, the ultimate moral evaluation of the actions of individuals. I do not take it as implying (...) that the individual should live his life on the basis of constant evaluations of this sort. For there are different levels of decision making each with its appropriate criteria. For example, we each inevitably make many of our decisions from the point of view of our own personal self-fulfilment and this cannot regularly take a directly utilitarian form, nor should the utilitarian want it to do so. His claim is at most that we should sometimes review our life from the point of view of a kind of impersonal moral truth of a universalistic utilitarian character. (shrink)

This passage has caused much discussion and much variety of opinion, and it still remains doubtful whether the later commentators in their efforts at exact interpretation have been more successful than the earlier ones. The general sense is sufficiently clear. Medea is making an apology to the Chorus of sympathizing Corinthian ladies for her delay in appearing before them. So far all are agreed. The difficulties, real or unreal, arise when we begin to inquire what form the apology actually takes. (...) First of all there are doubts as to the meaning of το ς μ μᾂπο. in the Scholia. we have a gloss μῂ όρώμνο είνα. and the explanation το Xωρίςεσθα καì ᾂτν ποθεν μμάτων είνα. Many scholars have taken exception to this view on two grounds, as stated by Verrall ad loc, because ‘the sense of motion is not there, and there is no reference to any eyes in particular.’ He requires either authority or analogy for this. As far as the absence of motion is concerned, it is sufficient to refer to Thuc. 1, 7 αί δ παλααί ᾀπθαλσσης μλλον ῲκίσθησαν id I, 99ναμῄ ᾀπ οκου σ,γ. Il. B 292 μένεν ᾀπ ᾑς ᾀλòΧοο. Then there is the analogous expression αί γàρ δῂ μοᾀπ οὒατος ώδε γένοτο . As to the second objection, why is it necessary that the eyes of anyone in particular should be referred to ? There is no more ambiguity here than there is in Il Ψ 53 θâσσον ᾀπ θαλμν, where the meaning is ‘so as to be out of sight, not of me or you, but of everybody.’ In fact, it could not be maintained with any show of reason that ᾀπθαλμνand ᾀποὒατς could not mean ‘out of sight’ and ‘out of hearing’. (shrink)

Horace has told us that the author of a literary work, qui uariare cupit rem prodigialiter unam, falls into absurdities. Much more likely to meet this fate is the interpolator who has the same ambition. The above four lines are a case in point; for it is fairly certain that if this Hymn were presented to readers as it came from the hand of its author, the whole passage with its phenomenal bull and its four pacifist dogs which apparently had (...) agreed together not to bark and bite, ‘as is their nature to,’ would not be found in the text. Undoubtedly it is true, though it is by no means a marvel , that the bull which was somewhere else and the dogs which were following in his wake were not taken by the infant cattle-lifter who was satisfied, as he well might be, with a trifle of fifty cows. The veracity of the interpolater in this regard may, therefore, pass without question, and furthermore his knowledge of epic metre does not fail seriously till he reaches the fourth line, although ό δ ταρος is not really epic and λλων not λλων is required in the opening line, for he certainly did not mean, as he unwittingly says ‘other bulls,’ but ‘the others, the cows.’ After ο μνλειθεν it is quite out of the question that οĩ τε κύνες τε ταȗρος, two flagrant examples of the later article, should follow. (shrink)

These lines conclude the account of Hermes inventing the primitive method of producing fire by friction, and it is evident that the writer had in mind σ 308: περ δ ξλα κγχανα θ;καν, αα πλαι περκηλα, νον κεκεασμνα χαλκ, cf. also ε 240. Gemoll accordingly in his edition read αα λαβν, and for so doing was rebuked by Messrs. S. and A. in their best dogmatic manner: ‘Gemoll's αα cannot be accepted; ολα is sound, though the meaning is not certain.’ (...) In other words: ‘Whether ολα makes sense or nonsense, it is right.’ Finally, they say that ολα probably means ‘whole’, and this translation is, I think, confirmed by l. 137; but then it follows that the hymn-writer was flatly contradicting the κεκεασμνα in Homer's line, and knew no more about fire-lighting than these trenchant editors. Ignition fuel has a character of its own, and from this point of view Gemoll has the advantage. (shrink)

As is well known, many editors, following Valckenaer, reject the bracketed line altogether; but the omission leaves the opening clause with a very unsatisfactory ending. μπρέποντας αίθέρι, heavily stressed by its position, seems to form little less than an anticlimax, unless we assume that the stars could hardly be expected to shine in the sky. On the other hand, when line 7 is added, έμπρέποντας αίθέρ στέρας brings out clearly the fact that only certain conspicuous stars or constellations are meant—those (...) which serve as guides to the operations of agriculture and navigation, such as the Pleiades, Arcturus, and Orion, as we may see from Hesiod, Op. 609 onwards. (shrink)