Representation-mediated Inhibitory Learning in the Conditioned-suppression Procedure

In three experiments, rats in group I (for intermixed) were given non-reinforced exposure to two compound stimuli, AX and BX, where A and B represent different auditory cues, and X represents a visual cue. AX and BX were presented in alternation. Group B (blocked) received similar exposure except that subjects experienced a block of AX trials and then a block of BX trials. Subsequent shock reinforcement of A was found to endow B with inhibitory strength in group I, as assessed by retardation (Experiments 1 and 2) and summation tests (Experiment 3). This outcome confirms and extends the results reported by Espinet, Iraola, Bennett, and Mackintosh (1995) and constitutes a further example of mediated learning in which the associative strength of a stimulus is found to be modified as a consequence of training given to some other event with which that stimulus is associated.     

Facial expressions: An objective method in the quantitative evaluation of emotional change

A method is presented for obtaining a seriesofsilhouettes that were analyzed as profiles of the human face. When depressed psychiatric patients smiled before and after electroshock therapy, a greater facial displacement was recorded after treatment. Controls did not show any trend in this regard.     

Suicide by Industry and Occupation: A Structural-Change Approach

ABSTRACT: Data on suicide rates for males age 20 to 64 by occupation and industry for 1950 are examined. Two hypotheses are tested: The first, a static hypothesis relating variations in suicide with the size of the group from which choice of significant others is made, was not supported. The second, in which variations in suicide are related to changes in the size of the group from which significant others are selected, is supported. The authors conclude that their structural change approach to suicide is compatible with both sociological and psychological approaches to suicide.     

The use of small filament lamps as visual stimuli

The purpose of this note is to draw attention to the fact that the time needed for small filament lamps to reach full brightness is dependent upon the time for which they have been previously switched off. This dependence is a possible source of error in biassed choice reaction sequences, and a circuit is given which avoids the difficulty.