Visual identification following inferotemporal ablation in the monkey

Nine monkeys took part in two experiments on visual learning and the effect of inferotemporal ablation. The first experiment contrasted lesion effects in two tasks given to separate groups of animals: serial visual reversal learning set with only two visual stimuli in use throughout the experiment, and discrimination learning set with a new pair of visual stimuli for each discrimination problem. Following inferotemporal ablation, the within-reversal learning rate recovered to the normal pre-operative level, while within-problem learning in discrimination learning set remained substantially impaired. This result suggests that inferotemporal ablation does not directly impair visual associative learning, but rather produces a defect in visual identification such that only a small set of familiar stimuli can be correctly identified and associated with reward. The second experiment replicated an earlier experiment in showing that monkeys with inferotemporal ablation could learn at a normal rate to choose between stimuli according to their spatial orientation. A relation between the two types of unimpaired visual learning in the operated animals was suggested and analogies with clinical syndromes were discussed. The experimental results were interpreted within a distributed-trace model of learning, and this interpretation was illustrated and supported by a computer simulation presented in the Appendix.     

Reliability and validity of the Multiple Affect Adjective Check List - Revised

A recent factor analysis of the Multiple Affect Adjective Check List (MAACL) changed the Anxiety, Depression, and Hostility scales from bipolar to unipolar scales and added two new scales: Positive Affect and Sensation Seeking. Internal reliability of the MAACL-R scales, computed for normal and patient samples, was adequate for state and trait forms except for Sensation Seeking. Test-retest reliability in college students was higher for the trait form with retest intervals of from 2 to 8 weeks than for the state form with retest intervals of from 2 to 5 days. The pattern of correlations among self-, peer, and counselor ratings and the MAACL-R scales for normal and patient samples indicates improved discriminant validity and equally good convergent validity as the old scales. The use of standard scores that are indexed to the number of items checked reduced scale intercorrelations by controlling the acquiescence set.The financial support of the Weldon Springs Endowment Fund, University of Missouri at Kansas City, toward the completion of this research project is gratefully acknowledged.     

Family coercion and valid consent

Coercion is commonly said to invalidate consent, and that is always true if the source of the coercion is the physician. However, if it is a family member who coerces the patient to consent, the resultant consent may be quite valid and treatment should proceed.     

Studies on latent influence by the spectrometer method I: The impact of psychologization in the case of conversion by a minority or a majority

The effects of psychologization on the conversion phenomenon were studied for cases where influence was exerted either by a minority or by a majority. In a 2×2×3 ANOVA design (minority source versus majority source, personality versus aesthetics, phases) 48 subjects are faced with a confederate who represents either 18.2 per cent or 81.8 per cent of a population and consistently responds green when an objectively blue slide is shown. Colour perception is said to be associated with either aesthetic or personality factors. The prediction is in this last case that psychologization of the majority induces conversion of the subjects, while psychologization of the minority stands in the way of this latent influence. Influence is measured by four response levels for each trial of the three phases (pre-influence, post-influence in the presence or in the absence of the influence source). Manifest influence is measured in terms of the Subjects' Judgements and by the way in which they adjust their stimulus colour perception, as determined with the help of a spectrometer. The latent influence is reflected by the subjects' judgements about the colour of the afterimage upon presentation of the stimulus, as measured on a nine-point scale and with the help of spectral adjustments of this afterimage. The subjects having been influenced without being aware of their conversion shows up in the shifts toward green or the complementary colour of green. Results indicate a cross-over for the effect of indirect influence. Under the personality condition, psychologization has the anticipated effect. The majority is the only one to produce a conversion. The attenuating effect of minority influence again manrfests itserf (Mugny and Papastamou, 1980). Under the aesthetic condition, non-psychologization also induces latent and perceptive shifts, but they go in the opposite direction and coincide closely with other results (Moscovici and Personnaz, 1980; Personnaz, 1981). In this condition, only the minority exerts an influence on all three levels.