Younger and older adults' perception of the Wundt-Hering illusion as a function of display illumination and reflectance contrast

Reflectance contrast (i.e., black as compared to grey figures on white ground) and display illumination were manipulated to vary the brightness contrast of Wundt-Hering figures. 16 college students and 16 older adults were presented with high, medium, and low reflectance contrast figures. For half the participants, display illumination was manipulated by covering the figures with a .5 yellow neutral density filter. Magnitude of the illusion increased significantly with increased reflectance contrast for college students, and college students were significantly more susceptible to the high contrast figures than were older adults. Display illumination had no effect on the performance of either group.     

Auditory attention switching in hyperactive children

The ability to rapidly reorient attention in the auditory modality was studied in hyperactive children. Hyperactive and nonhyperactive subjects matched on age, sex, and IQ listened to dichotically presented lists for prespecified targets. Reorientation was studied by comparing performance on trials requiring subjects to reorient their attention during a list to performance on trials requiring no switching of attention. The results indicate that although nonhyperactive children were temporarily disrupted by the switch, they eventually reoriented to the cued ear. In contrast, once hyperactive children were disrupted by the switch, they did not reorient to the cued ear. As the pattern in performance comparing hyperactive and nonhyperactive subjects resembles the pattern previously found in comparing younger and older subjects, these results are consistent with the hypothesis that the auditory reorientation skills of hyperactive children are developmentally immature.     

Psychological Aspects of Disaster: Issues for the 1990s

In 1987 a series of disasters shocked the UK. For many it was the start oftheir involvement with the traumatic effects of disaster management. In response, the British Psychological Society established a working party to consider issues which might need to be addressed. Six areas were identified for consideration: prevention, planning, training, assessment and provision of services, inter-agency and professional co-operation, and the role of government. In spite of a large and growing literature on trauma and disaster management, satisfactory responses to the needs of those involved are still lacking. Lessons learned from the fire at Bradford were not effectively applied to subsequent disasters, in spite of the valiant efforts of those involved to pass on the results of their experience. This paper addresses some of those critical lessons, and suggests areas that require considered action for disaster planning in the 1990s.     

Integration of intention and outcome in moral judgment

This experiment studied how the intention of an actor affected moral judgment. Subjects received information about the intention of an actor, and about the value of the outcome of his action to a used as stimuli, and both gave similar results. The main data followed the parallelism prediction, evidence for the operation of some simple integration model. Auxiliary data provided a critical test that eliminated the adding rule and supported the averaging rule. These results suggest that previous work on the cognitive algebra of human judgment may generalize to the moral realm. These results also illustrate how information integration theory can provide a significant advance upon phenomenonological approaches to moral judgment such as have been used by Heider and Piaget.     

Pauses and syntax in American sign language

Research on spoken languages has shown that the durations of silent pauses in a sentence are strongly related to the syntactic structure of the sentence. A similar analysis of the pauses (holds) in a passage in American Sign Language reveals that sequences of signs are also interspersed with holds of different lengths: long holds appear to indicate the ends of sentences; shorter holds, the break between two conjoined sentences; and the shortest holds, breaks between internal constituents. Thus, pausal analysis is a guide to parsing sentences in ASL.     

Differential reinforcement of vocal duration

The effects of differential reinforcement of vocal duration were examined in a series of experiments in which each of 28 subjects (Ss) emitted a vowel whenever a light was flashed. In the first phase of each experiment, a penny was dispensed after each of 20 responses. In the second and subsequent phases, only those responses whose durations exceeded a criterion were reinforced; when 10 successive reinforcements were presented, one phase was terminated and the next begun. The criterion for reinforcement in each phase was determined by a different schedule in each of six experiments; it ranged from 80 to 120 per cent of the mean duration of the 10 terminal responses in the prior phase. Differential reinforcement effected a large and systematic change in the duration of vocal responses as long as the responses selected for reinforcement had a sufficiently high probability of occurrence. This requirement was formulated as the difference between the criterion duration and the mean duration of the terminal responses in the prior phase, divided by their standard deviation. This statistic, named the shaping index, was correlated with the number of responses emitted before each phase was terminated. It was found to be large whenever the shaping process failed. Many Ss failed to tact the reinforcement contingency despite marked changes in their vocal behavior and extensive probing by a questionnaire, administered at the end of each session.     

Divine timelessness and personhood

International Journal for Philosophy of Religion -