Visual memory and stimulus repetition effects

Recent investigations of memory for randomly configured patterns indicate that visual memory can involve distinct short-term and long-term components. The appearance of a visual recency effect that is confined to the last-presented item is believed to result from the active visualization of this item during the retention interval. Studies of the retention of familiar visual information have also suggested that the short-term effects observed are a result of active visualization. In a review of these studies, however, we argue that the effects obtained with familiar visual information are not necessarily a result of active visualization and, indeed, may not involve anything other than long-term visual memory. For example, Rabbitt and Vyas (1979) observed a visual recency effect in a serial choice reaction time task involving familiar information. That this recency effect was confined to the final item accords with the results obtained with unfamiliar visual information. However, this choice reaction time task did not require subjects to remember previous stimuli, so it is unlikely that they actively visualized them. With the case for a distinct short-term visual memory currently resting on the recency effect interpreted as reflecting a process of active visualization, this result is especially important. In the second part of the present paper, we report a series of experiments that provides an understanding of the visual recency effect in the serial choice reaction time task. We conclude from these studies that this effect is not due to visualization or to a visual trace either decaying or being overwritten by a succeeding stimulus.     

A new dynamic visual illusion: The bending hourglass

Attention, Perception, & Psychophysics - A white hourglass moving laterally across a black surface appears to bend in such a way that the narrow portion lags behind its true position, but only...     

CHANGING PERSPECTIVES IN COGNITIVE NEUROPSYCHOLOGY*

Neuropsychology, the study of behavioral and mental disorders resulting from brain damage, seeks to integrate observable mental and motor functions with knowledge of nervous system structure and function. The first part of this paper deals with the empirical and theoretical contributions that arise from the study of classical clinical syndromes, from cognitive psychology based on information processing, and from the computationally-based study of complex cognitive systems such as language. The second part of this paper deals with two areas of neuropsychological research, memory mechanisms and motor behavior, that exemplify some of the methodological and conceptual problems that arise in trying to bridge animal and human studies, or psychological and physiological levels of analysis. Suggestions are made for how greater progress can be made by considering fundamental processes, and, by focusing on levels of abstraction useful to both the psychologist and the biologist. The last part of the paper briefly discusses some of the major issues involved in an attempt to establish a neurobiologically-based theory of human behavioral and mental function.     

Intermodal perception of expressive behaviors by human infants

Four experiments demonstrate that infants of 5 and 7 months can detect information that is invariant across the acoustic and optic presentations of a single affective expression. Infants were presented simultaneously with two filmed facial expressions accompanied by a single vocal expression characteristic of one of the facial expressions. The infants increased their looking time to a facial expression when it was sound-specified, as compared to when that filmed expression was projected silently. Even when synchrony relations were disrupted, infants looked proportionately longer to the film that was sound-specified, indicating that some factor other than temporal synchrony guided the infants' looking behavior. When infants viewed the filmed facial expressions either in a normal orientation or upside-down, those infants viewing the facial expressions in the normal orientation looked appropriately, while those viewing the inverted films did not. These findings support the view that infants are sensitive to amodal, potentially meaningful invariant relations in expressive behaviors. These results are discussed in the context of J. J. Gibson's theory of affordances.     

Public and private self-awareness: When personal attitudes conflict with societal expectations

Different methods of inducing self-awareness have generally been assumed to be interchangeable. The present paper argues that the two most widely used manipulations of self-awareness—audiences and mirrors—differ in an important way: specifically, audiences increase focus on the public aspects of the self, whereas mirrors focus attention on the private aspects of the self. It is further argued that the standards that are used to regulate behavior depend upon which of these self-aspects is taken as the object of attention. Attention to the private self may result in behavior that reflects personal attitudes; attention to the public self may cause behavior to become more consistent with societal expectations. This reasoning was tested in two studies in which subjects served as “teachers” in an aggression paradigm. Each subject in Experiment 1 opposed the use of punishment in learing, but felt that other people favored it. Compared to the control condition, the presence of a mirror led to decreased levels of shock, and the presence of an evaluative audience led to increased levels of shock. Experiment 2 made use of subjects who favored the use of punishment but felt that others were against its use. Compared to the control group, the presence of a mirror led to increased levels of shock whereas the presence of an evaluative audience led to decreased levels of shock. Taken together, these findings indicate that self-awareness manipulations need to be chosen according to the aspect of self that is to be the object of self-attention. Discussion centers on the implications of the public-private distinction.     

Against definitions

Definitional accounts of language structure are explored in this paper. Several classes of arguments for definitions are reviewed; those which connect to: classical theories of reference, theories of informal validity, theories of sentence comprehension, and theories of concept learning. We suggest that, for each of these areas, accounts which rely upon definition are, in fact, not to be preferred on evidential grounds to plausible non-definitional alternatives. We also present a series of experimental observations bearing on one of these areas — that of sentence comprehension. We show that one widely cited class of examples of definitional structures — that of “causative verbs” — fails to affect subject judgements of those relations among the words of causative sentences which depend upon the putative definitional structures. Such subject judgements are independently demonstrated to be sensitive to structural relations of comparable type for other linguistically non-problematic types.     

Encoding processes and the recall of text

Two experiments investigated the proposition that the amount of cognitive effort expended to encode information will be directly related to recall of that information. While previous research has shown that amount of processing may affect recall, these studies have generally drawn on the notion of an elaborated memory representation to explain their results. In this study, the amount of processing required to correctly interpret anaphoric relations was varied while the elaboration of the memory trace was held constant. These experiments employed a self-paced reading paradigm in which subjects read a series of short paragraphs and later were cued to recall the final sentence of each paragraph. It was found that recall was significantly improved when more processing was required to correctly interpret the anaphoric relationship expressed in the final sentence. These findings suggest that encoding processes can affect recall performance without elaboration of the memory representation.     

The relationship between sex-role orientation and vocational undecidedness: An exploratory study

The relationship between sex-role orientation and vocational choice has attracted empirical interest but many studies conducted have been inconclusive. Giankos and Subich (1986), however, produced a highly significant result (p < .001) which suggested that non-traditionally sex-typed subjects are more vocationally indecisive than traditionally sex-typed subjects. To attempt a replication of this finding, data were collected from 65 subjects, of whom 32 were unemployed and the remaining 33 were in full-time tertiary education. Although statistical analysis revealed no main effect on vocational indecision for either the sex-role identity or unemployed/student distinctions, the data suggested an interaction between these two factors. The level of statistical significance fell between .05 and .10. This trend, together with Gianakos and Subich's finding, suggest that vocational indecision may be associated with an interaction between sex-role orientation and socio-economic factors.