MOTIVATING AUTISTIC CHILDREN THROUGH STIMULUS VARIATION

This study evaluated the differential effectiveness of two methods of presenting discrimination tasks when teaching autistic children. In a constant task condition, the common method of presenting a single task throughout a session was used. In a varied task condition, the same task was interspersed with a variety of other tasks from the children's clinic curricula. Results showed declining trends in correct responding during the constant task condition, with substantially improved and stable responding during the varied task condition. In addition, naive observers judged the children to be more enthusiastic, interested, happier, and better behaved during the varied task sessions. These results suggest that “boredom” may be a particularly important variable to control in the treatment of autistic children, and that particular care may be necessary when defining criteria for task acquisition. The results are discussed in relation to the literature on increased responsivity to stimulus novelty and variation.     

INTERTRIAL INTERVAL DURATION AND LEARNING IN AUTISTIC CHILDREN

This study investigated the influence of intertrial interval duration on the performance of autistic children during teaching situations. The children were taught under the same conditions existing in their regular programs, except that the length of time between trials was systematically manipulated. With both multiple baseline and repeated reversal designs, two lengths of intertrial interval were employed: short intervals with the S^D for any given trial presented approximately one second following the reinforcer for the previous trial versus long intervals with the S^D presented four or more seconds following the reinforcer for the previous trial. The results showed that: (1) the short intertrial intervals always produced higher levels of correct responding than the long intervals; and (2) there were improving trends in performance and rapid acquisition with the short intertrial intervals, in contrast to minimal or no change with the long intervals. The results are discussed in terms of utilizing information about child and task characteristics in terms of selecting optimal intervals. The data suggest that manipulations made between trials have a large influence on autistic children's learning.     

Note on computation of bi-serial correlations in item evaluation

By the use of an algebraic variant of the ordinary formula for bi-serial correlation, tables, and graphic devices, a time-saving systematic procedure for the computation of bi-serial correlation co-efficients is outlined for application to the evaluation of items of a test. A table of z for arguments ofp=.000 top=.999 is given.     

INCREASING THE INDEPENDENT RESPONDING OF AUTISTIC CHILDREN WITH UNPREDICTABLE SUPERVISION

We investigated the role of predictable versus unpredictable supervision on the independent task responding of three autistic children. In a predictable supervision condition, the therapist was present in the setting for a regular period of time and then was absent for the remainder of the session. In an unpredictable supervision condition, the therapist's presence was scheduled on a random, intermittent, and unpredictable basis throughout the session. The multiple baseline analysis showed that the unpredictable supervision produced much higher levels of on-task responding during the therapist's absence for all three children. Analysis of work completed during the therapist's absence also favored the unpredictable supervision condition. The results are discussed in relation to the literature on generalization and educational practice.     

Learned helplessness versus reactance: The effects of sex-role stereotypy

Both learned helplessness and reactance theories hypothesize that the effects of noncontingent reinforcement on later performance are related to the amount of experience with noncontingent reinforcement and to the subjects' expectations of control. In addition, learned helplessness theorists have suggested that performance may depend upon the causes to which subjects ascribe failure. The present study investigated these hypotheses by defining expectation of control as the degree of sex-role stereotypy and by assessing causal attributions. Forty men and 40 women were given either zero, three, four, five, or six discrimination problems for which they received noncontingent reinforcement; they were subsequently tested on anagrams and math problems. Causal attributions were rated after each set of tasks. The data suggested the following. (1) In general, under conditions of noncontingency, high masculinity subjects performed better on anagrams and low masculinity subjects performed worse on anagrams than subjects in the control conditions; stereotypic femininity was not related to performance. (2) Ratings of attributions for failing the discrimination problems were generally unrelated to performance, although there was weak support for the facilitating effects of effort attributions. (3) Subsequent to anagram and math performance, women rated external attributions higher following success and internal attributions higher following failure than did men. The implications for learned helplessness and reactance theories are discussed.The authors would like to thank Stephen Haynes and Jack McKillip for their helpful comments on earlier versions of this paper.