PubMed · 5654888
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M A Vianello, S H Evans. 1968. Note on pitch discrimination learning.. https://doi.org/10.2466/pms.1968.26.2.576
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People often falsely recognize nonstudied lures that are semantically similar to previously studied words. Behavioral research suggests that such false recognition is based on high semantic overlap between studied items and lures that yield a feeling of familiarity, whereas true recognition is more often associated with the recollection of details. Despite this behavioral evidence for differences between true and false recognition, research measuring brain activity (PET, fMRI, ERP) has not clearly differentiated corresponding differences in brain activity. A median split was used to separate subjects into Good and Poor performers based on their discrimination of studied targets from similar lures. Only Good performers showed late (1000--1500 msec), right frontal event-related brain potentials (ERPs) that were more positive for targets and lures compared with new items. The right frontal differences are interpreted as reflecting postretrieval evaluation processes that were more likely to be engaged by Good than Poor performers. Both Good and Poor performers showed a parietal ERP old/new effect (400--800 msec), but only Poor performers showed a parietal old/lure difference. These results are consistent with the view that the parietal and frontal ERP old/new effects reflect dissociable processes related to recollection.
A flat surface is more often judged to be convex after the touching of a concave surface than after the touching of a convex surface. This haptic after-effect increases with the time of contact with the curved surface till it saturates, and it decreases with the time-lapse between the touching of the first surface and the next one. In this paper, the haptic after-effect of two successively touched spherically curved surfaces is investigated. It is found that both surfaces contribute to the after-effect, but the after-effect is not additive. The time course of the after-effect of two successive surfaces can be described by a first-order integrator with a single time constant of about 7 s and an amplitude equal to the difference between the saturation levels of the after-effects of the two surfaces when measured in isolation. The new saturation level is therefore equal to that of the after-effect of the most recently touched surface.
The Wisconsin Cart Sorting Test (WCST) is a well-established measure of executive function. Practical and financial constraints have increased the need for abbreviated neuropsychological procedures. A number of abbreviated versions of the WCST have been introduced and cogent arguments can be made for one over another in certain situations. However, the single deck, 64-card WCST (WCST-64) is the most logical and practical short form. Psychological Assessment Resources (PAR) has recently published a new manual with comprehensive norms for the WCST-64. This paper reviews the new product, discusses the comparability of the WCST-64 and the standard version, and suggests directions for future research.