Evaluation of unconstrained sorting data

Two statistics are offered for evaluating unconstrained sorting performance in a specific task when categories are E-defined. One statistic is based upon empirically estimated sampling distributions and can be used for determining sorting performance significantly deviant from chance for any number of S-defined categories; the second statistic can be used to evaluate consistencies between S- and E-defined categories, regardless of the number of categories used by S. The present procedure provides a statistical basis for evaluation of performance where no adequate evaluation procedures are now available.     

Arousal and the Bakan vigilance task: The effects of noise intensity and the presence of others

The joint effects of social setting and loud noise on task performance are examined. In a modified version of the Bakan vigilance task subjects were required to detect a sequence of two identical even digits and to report the two digits preceding the signal. Two types of acoustic environment were compared: loud noise at 90 dBC and quiet noise at 60 dBC. Two types of social setting were employed: “pair” where two subjects worked in the same room on similar tasks, and “single” where a subject performed the task alone. The effects of noise and the presence of another did not interact. Loud noise increased the speed of responses to signals early in the task. This effect is attributed to noise-induced arousal. There was a higher incidence of recall errors in pre-signal digits when subjects were in pairs. This effect is attributed to distraction. This research was part of a series of studies sponsored by the Social Science Research Council (Grant HR 5563 awarded to Dr. A.J. Chapman and Dr. D.M. Jones).     

Avoidant control difficulty and aversive incentive appraisals: Additional evidence of an energization effect

There is evidence that certain physiological and subjective indices of stress are relatively great when control over aversive outcomes is moderately difficult and relatively reduced when control over such outcomes is either easy or impossible. A possible explanation is suggested by Brehm's recent theory of motivation, which asserts that energy mobilization and the perceived unpleasantness of an aversive event will (a) increase with the difficulty of avoidant behavior so long as avoidance is believed to be possible and worthwhile, and (b) be low when avoidant behavior is impossible, not worthwhile, or simply unavailable. This article reports two experiments that examined appraisals of an aversive incentive under conditions where avoidance was expected to be easy, difficult, and impossible. The first demonstrated the complete nonmonotonic pattern of appraisals predicted by the energization theory, something that has proved elusive in previous investigations. The second study demonstrated this as well and, in addition, showed a correspondence between subjects' incentive appraisals and their cardiovascular responses immediately before and during an avoidance task period. Implications and alternative interpretations are discussed.This research was supported in part by a Faculty Research Award from the University of Alabama at Birmingham.     

Empowering people with physical disabilities through advocacy skills training

Members of an advocacy organization for people with physical disabilities were trained to identify and report issues at group meetings. In addition, two consecutive chairpersons were trained to conduct action-oriented meetings. Measures of group members' activities outside meetings and related outcomes on identified issues were also collected. Results indicated increases in the number of disability-related issues reported by trained members and consistent improvements in chairperson performance following training. Retrospective interviews and permanent records showed that advocacy activities, as well as the outcomes of members' actions, increased after training. These findings and their implications for the empowerment of people with disabilities are discussed.     

Evaluation of a shaping procedure with the changing-criterion design

This study used the changing-criterion design to document the effectiveness of a behavioral training package to alter the topography of a complex behavior. In this case, bed-making was established for a severely debilitated adult mental patient who was chronically institutionalized. Experimental control was demonstrated by a step-wise progression in performance to the final target behavior. The changing-criterion design provides an effective record of the shaping process and is sufficiently flexible for other single-subject design elements to be included.     

The effects of cued UCS rehearsal on the retention of differential 'fear' conditioning: an experimental analogue of the 'worry' process

This study describes a human electrodermal conditioning experiment in which subjects were asked to mentally rehearse the UCS in a period following initial fear conditioning and prior to a test period involving nonreinforced presentations of the CS. Subjects who were asked to rehearse the UCS retained a differential fear CR during subsequent unreinforced presentations of the CS, but control subjects who were asked to rehearse either a nonaversive event or an aversive event unrelated to the UCS failed to retain the differential CR they had acquired during conditioning. These results suggest that rehearsal of the UCS during periods when CS and UCS are absent can aid the persistence of a fear CR in the absence of further pairings of the CS and UCS. It is argued that these effects can be explained in terms of the effect of UCS rehearsal on the strength and evaluation of the UCS representation. It is also suggested that cued UCS rehearsal might provide a useful procedure for understanding clinical incubation effects and for understanding how the 'worry' process contributes to the maintenance and incubation of fear.