DISSOCIATION OF STORAGE AND REHEARSAL IN VERBAL WORKING MEMORY:

Abstract— Current cognitive models of verbal working memory include two components a phonological store and a rehearsal mechanism that refreshes the contents of this store We present research using positron emission tomography (PET) to provide further evidence for this functional division In Experiment I, subjects performed a variant of Sternberg's (1966) item recognition task Experiment 2 used a continuous memory task with control conditions designed to separate the brain regions underlying storage and rehearsal The results show that independent brain regions mediate storage and rehearsal In Experiment 3, a dual-task procedure supported the assumption that these memory tasks elicited a rehearsal strategy     

Can phronesis save the life of medical ethics?

There has been a growing interest in casuistry since the ground breaking work of Jonsen and Toulmin. Casuistry, in their view, offers the possibility of securing the moral agreement that policy makers desire but which has proved elusive to theory driven approaches to ethics. However, their account of casuistry is dependent upon the exercise of phronesis. As recent discussions of phronesis make clear, this requires attention not only to the particulars of the case, but also to the substantive goods at stake in the case. Without agreement on these goods attention to cases is unlikely to secure the productive consensus that Jonson and Toulmin seek.     

SEARCHING FOR MOOD DEPENDENT MEMORY

Though it has sometimes been shown that events encoded in a certain state of affect or mood are most retrievable in that state, neither the circumstances under which mood dependent memory (MDM) occurs nor the mechanisms that enable its emergence are as yet well understood. The purpose of the research reviewed here is to clarify these circumstances and mechanisms. To this end, the research focuses on four factors that appear to play pivotal roles in the occurrence of MDM. These factors are (a) the nature of the target events or the manner in which they are encoded (ie, are events generated through internal mental processes such as reasoning, imagination, or thought more apt to be forgotten following a shift in sources?), (b) the nature of the retrieval task (is it possible to demonstrate mood dependence using implicit rather than explicit measures of memory?), (c) efficacy of mood modification (do strong, stable, and authentic affective states promote the appearance of MDM?), and (d) whether alterations in affect are one-dimensional or two-dimensional (does a shift along both the pleasure and the arousal dimensions of mood impair memory more than does a shift along the pleasure dimension alone?) Exploring these four factors in detail may make it possible to resolve much of the controversy that now surrounds MDM, and to acquire fresh insights into its cognitive and affective foundations.     

Gross overactivity: A study by direct observation

A group of children who were rated as grossly overactive by a clinician was compared with a matched control group on various measurements of their behavior in a clinical interview situation and in a psychological test situation. An observational schedule was developed to discern those behaviors related to the concept of overactivity. These behaviors were operationally defined to enable reliable replication. The experimental group showed an excess in quantity of mechanically recorded movement as well as an increase in a cluster of behaviors including distractibility and disinhibition. Situational effects on those symptoms were noted. The symptoms were best observed in a semistructured clinical interview situation.This project was carried out while S. L. Luk was a research worker at the Institute of Psychiatry, London, supported by the University of Hong Kong. The authors express sincere thanks to Dr. S. Sandberg for her help in the reliability study, to Dr. J. Bacon-Soong for his statistical advice, and to Miss Ivy Wong for secretarial help.The coding scheme is available from the author.     

The Influence of Public Self-Consciousness and the Audience's Characteristics on Withdrawal from Embarrassing Situations

ABSTRACT Two studies examined the impact of public self-consciousness (PSC) and the audience's characteristics on withdrawal from embarrassing situations In Study 1 subjects verbally responded to a series of hypothetical events of an embarrassing nature before audiences described as either strangers or friends Subjects high in PSC expressed similar tendencies to withdraw no matter who the audience was, whereas low PSC subjects reported that they were less likely to withdraw when the audience was composed of friends as compared to strangers Study 2 had high and low PSC subjects perform an embarrassing act in front of either a friend or two types of strangers–those they either would or would not interact with in the future Low PSC subjects withdrew sooner from an audience of strangers they would have to interact with than from either an audience of friends or strangers they would never see again Again, high PSC subjects responded similarly to the three audiences They tended to withdraw quickly no matter who the audience was Discussion focuses on the role situational and dispositional factors play in withdrawal from embarrassing situations     

The language dependence of accuracy

David Miller has demonstrated to the satisfaction of a variety of philosophers that the accuracy of false quantitative theories is language dependent (cf. Miller 1975). This demonstration renders the accuracy-based mode of comparison for such theories obsolete. The purpose of this essay is to supply an alternate basis for theory comparison which in this paper is deemed the knowledge-based mode of quantitative theory comparison. It is argued that the status of a quantitative theory as knowledge depends primarily on the soundness of the measurement procedure which produced the theory; such soundness is invariant, on my view, under Milleresque translations. This point is the basis for the linguistic invariance of knowledgelikeness. When the aim of science is not construed simply in terms of the truthlikeness or accuracy of theories, but in terms of the knowledge such theories embody, Miller's language dependence problem is overcome. One result of this analysis is that the possibility of objective scientific progress is restored, a possibility that Miller's analysis has prima facie defeated.I am grateful to Noretta Koertge for numerous comments and criticisms. Thanks are also due to David Miller for clarification of several points in his (1975). Veronica Barnes also made a number of pertinent observations.     

Additive and multiplicative models for gamma distributed random variables,and their application as psychometric models for response times

A class of models for gamma distributed random variables is presented. These models are shown to be more flexible than the classical linear models with respect to the structure that can be imposed on the expected value. In particular, both additive, multiplicative, and combined additive-multiplicative models can be formulated. As a special case, a class of psychometric models for reaction times is presented, together with their psychological interpretation. By means of a comparison with existing models, this class of models is shown to offer some possibilities that are not available in existing methods. Parameter estimation by means of maximum likelihood (ML) is shown to have some attractive properties, since the models belong to the exponential family. Then, the results of a simulation study of the bias in the ML estimates are presented. Finally, the application of these models is illustrated by an analysis of the data from a mental rotation experiment. This analysis is preceded by an evaluation of the appropriateness of the gamma distribution for these data.     

EQUATING INVERSE PROBABILITIES IN IMPLICIT PERSONALITY JUDGMENTS

Abstract— Meehl and Rosen (1955) observed that their colleagues tended to equate the sensitivity of a sign (its probability given a diagnostic category) with its predictive accuracy (the probability of the diagnostic category given the sign). Such equating of inverse probabilities implies ignoring base rates. Later, many researchers demonstrated such neglect in a number of experimental contexts involving hypothetical judgments; others have found some use of base rates—but only when base rates were supplied by the experimenter, in which case even irrelevant base rates influenced judgment. The present study tested for equating conditional probabilities in a context similar to the contexts involved in the initial observations—that is, subjects strove for accuracy rather than attempted to make good judgments about hypothetical problems, and the base rates were generated by the subjects themselves. Neglect of base rates was revealed by within-individual comparisons showing subjects equated inverse probabilities without equating the corresponding unconditional ones.     

The object-line inferiority effect in pigeons

Eight pigeons (Columba livia) were trained to discriminate between diagonal lines presented alone or embedded in a redundant L-shape right-angle form. The stimuli were white and were presented in an environment that was otherwise totally dark. Numerous experiments done with human observers have shown a strong superiority effect when the diagonal lines are embedded in redundant contexts. However, in Experiment 1 ofthe present study, the pigeons discriminated significantly better between the two diagonal lines when presented alone than when they were embedded in the right-angle context. In order to check on the possibility that these results were restricted to the semi-Ganzfeld condition of Experiment 1, a second experiment was done with black stimuli presented on a white background. Results of Experiment 2 also showed a strong distractor effect. The results of the present experiments confirmed the predictions of the Heinemann and Chase model of pattern recognition by pigeons.