Response suppression on DRL by rats with septal damage

The effectiveness of the differential reinforcement for low rates of responding (DRL) contingency in suppressing response rates of septal rats was investigated by using a Multi-DRL-yoked-VI (variable interval) schedule of reinforcement. The yoking procedure equated the interreinforcement times on the two schedules. Each schedule was in effect for half of each session, and the change in schedule was signaled by the presence or absence of a cue light. Schedule order and DRL delay requirement were varied. For both normal and septal rats, the response rates were higher in the VI component than the DRL component; this effect demonstrates that the responding of septals as well as normals is suppressed by the differential reinforcement of a particular class of IRTs. A sharp difference in the level of responding occurred at the point of transition from one component of the multiple schedule to the other, which provides evidence of a discrimination between the two schedules for both normals and septals. The conclusion is that the responding of septals is suppressed by the DRL contingency and not controlled solely by the density and distribution of reinforcement.     

Reported mediators and individual differences in mental imagery

This study concerns the use of postlearning questionnaires to discover the strategies employed by subjects in memory tasks. Experiment 1 showed that the proportion of items for which subjects reported the use of imaginal mediators was an excellent predictor of their overall performance. Experiment 2 showed that this was true for concrete material, but not for abstract material. It is suggested that mediator reports provide an effective way of investigating individual differences in the use of mental imagery.     

Evaluation of two test-anxiety reduction treatments in a secondary prevention program

The study evaluated the effectiveness of both a new anxiety management training program and a cognitive modification procedure as part of a secondary prevention effort to identify and treat test anxiety early in the academic career of college students. Subjects were 40 college freshmen who had been identified as high test-anxious in an initial mail-out survey of the Test Anxiety scale. Subjects were randomly assigned to three experimental conditions: anxiety management training, a cognitive modification procedure, and a no-treatment control group. Results indicated that both the cognitive modification and anxiety management training treatments were effective in reducing test anxiety on a posttreatment administration of the Test Anxiety scale. Especially interesting, a significant difference in academic performance emerged between treatment and control groups three semesters after treatment, underscoring the preventive value of the program.     

Tactile localization of the direction and distance of sounds

In a previous paper, experiments were reported which demonstrated that human subjects can judge accurately the azimuthal direction of sounds using a tactile localization device. It was also demonstrated that a tactile analogue of selective auditory attention was possible with this system. Three additional experiments, reported here, indicate that subjects are also able to judge the distance of the sound source and can concurrently judge both the azimuthal direction and distance of a source. Comparisons were made between conditions where head movements were permitted lactive~ and conditions where the head was held still Ipassive, and between normal auditory judgments and tactile judgments. Active tactile performance was essentially similar to auditory performance. Active performance was superior to passive in both directional and distance judgment, but different components of the motor-sensory complex were found to contribute to active superiority in the two tasks. The implication of these experiments for the design of auditory prosthetic devices is discussed.     

Blaming Drunk Victims: Is It Just World or Sex Role Violation?

Richardson and Campbell (1980, 1982), in studying attributions of blame and responsibility for violent interactions, found that intoxicated victims were blamed more and held more responsible for their victimization than their sober counterparts. Two alternative explanations were proposed to account for this finding: the just world hypothesis and the effects of sex role violation. The present study was designed to test these explanations. One hundred twenty-nine males and 93 females read scenarios that varied the sex of the victim and the level of intoxication of the victim and the aggressor. Participants rated the responsibility of the aggressor, victim, and situation for the action and evaluated the aggressor and victim. Although strong support for neither of the hypotheses was demonstrated, more support was found for the effect of sex role violation than for the just world hypothesis.     

Olfactory Information Processing and Temporal Lobe Epilepsy

It has been suggested that olfactory information processing is impaired in patients with temporal lobe epilepsy. However, the existing evidence is not wholly in accordance with this notion. Patients with epileptogenic foci in the left temporal lobe, the right temporal lobe, or other brain regions were compared with normal control subjects in the identification and retention of common odors. All three patient groups were substantially and equally impaired in verbally labelling the odors in question. The patients with epilepsy associated with the left temporal lobe or with nontemporal regions showed no sign of any impairment on a test of immediate recognition memory for common odors. However, the patients with epilepsy associated with the right temporal lobe showed a specific disturbance in their retention of nameable odors. It is suggested that the latter patients were selectively impaired in their retrieval of the episodic memories which provide the context for the encoding of distinctive odors.     

Personality traits in women with Turner syndrome

Turner syndrome is caused by the total or partial absence of, or structural abnormalities in, one sex chromosome. A personality style characterized by traits related to low neuroticism and high extroversion has been reported for females with Turner syndrome, indicating possible genetic factors related to personality development. This study examines personality traits in 37 Swedish women with Turner syndrome using the Karolinska Scales of Personality Inventory. Compared to reference data, the subjects rated themselves as more sensation seeking, less detached, less verbally aggressive and less irritated. These results partially support previous findings. The subjects were divided into three karyotype groups: 45,X (n = 13), 45,X/46,XX or 45,X/45,XY (n = 13), and structural abnormalities (n = 11). Contrary to some previous findings, no differences in personality were found between the karyotype groups.     

Auditory frequency discrimination in adult developmental dyslexics

Developmental dyslexics reportedly discriminate auditory frequency poorly. A recent study found no such deficit. Unlike its predecessors, however, it employed multiple exposures per trial to the standard stimulus. To investigate whether this affects frequency discrimination in dyslexics, a traditional two-interval same-different paradigm (2I_1A_X) and a variant with six A-stimuli per trial (2I_6A_X) were used here. Frequency varied around 500 Hz; interstimulus interval (ISI) ranged between 0 and 1,000 msec. Under 2I_1A_X, dyslexics always had larger just noticeable differences (JNDs) than did controls. Dyslexic and control JNDs were equal at shorter ISIs under 2I_6A_X, but dyslexics became worse than controls at longer ISIs. Signal detection analysis suggests that both sensory variance and trace variance are larger in dyslexics than in controls.