A comparison of stimulus set size on tact training for children with autism spectrum disorder.

Previous studies on skill acquisition have taught targets in stimulus sets composed of different numbers of stimuli. Although the rationale for selection of a stimulus set size is not clear, the number of target stimuli trained within a set is a treatment decision for which there is limited empirical support. The current investigation compared the efficiency of tact training in 4 stimulus set sizes, each of which included 12 stimuli grouped into (a) 4 sets of 3 stimuli, (b) 3 sets of 4 stimuli, (c) 2 sets of 6 stimuli, and (d) 1 set of 12 stimuli. Results of all 4 participants with autism spectrum disorder show tact training with larger (i.e., 6 and 12) stimulus set sizes was more efficient than training with smaller (i.e., 3 and 4) stimulus set sizes.

Comparison of task interspersal ratios on efficiency of learning and problem behavior for children with autism spectrum disorder.

The current study extends the literature on task interspersal (TI) by comparing the effects of four different TI ratios on the efficiency of skill acquisition and on levels of problem behavior in children with autism spectrum disorder and related disorders. The four ratios of TI were 3:1, 1:1, 1:3, and 0:1 mastered-to-acquisition tasks. An adapted alternating treatments design was implemented to compare the cumulative number of stimuli mastered, mean training time to mastery, rate of acquisition, and the level of problem behavior. The results showed that the 0:1 condition was the most efficient intervention procedure for all four participants. In addition, TI did not lead to a greater reduction in levels of problem behavior.