The effect of stimulus duration on over-selectivity: Evidence for the role of within-compound associations.

The phenomenon whereby behavior becomes controlled by one aspect of the environment at the expense of other aspects of the environment (stimulus overselectivity) is widespread across many intellectual and developmental disabilities. However, the theoretical mechanisms underpinning overselectivity are not understood. Given similarities between overselectivity and overshadowing, exploring overselectivity using associative learning paradigms might allow better theoretical understanding of the phenomenon. Three experiments explored overselectivity using a simultaneous discrimination task with typically developing participants undergoing a cognitively demanding task. Experiment 1 investigated whether stimulus duration effects found within the overshadowing literature also occurred in an overselectivity paradigm, and demonstrated that greater overselectivity was observed when stimuli were presented for short durations (2s and 5s) compared with longer durations (10s). Experiment 2 demonstrated that a posttraining revaluation procedure resulted in retrospective revaluation for stimuli presented at shorter durations (2s) and mediated extinction for stimuli presented at longer durations (10s). Such results replicate findings from the overshadowing literature that have been interpreted in terms of within-compound associations while also supporting assumptions made by an extended comparator hypothesis. Experiment 3 uses an additional control condition to further demonstrate that the retr...
Source: Journal of Experimental Psychology: Animal Behavior Processes - Category: Zoology Source Type: research