Effects of instructions in probability learning.

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Abstract
"Instructions in two .70-.30 noncontingent probability experiments were varied for six groups. Groups 1 to 6 were told to consider the tasks as (a) conversation, (b) event prediction, (c) event prediction--with additional task information, (d) event prediction--avoiding a trial-by-trial basis of responding, (e) a problem involving responding for blocks of 20 trials, and (f) a problem involving the discrimination of the two events. Group 1 responded at an approximate 50% A-sub(1) level, Groups 2 and 3 approximately matched, and groups 4, 5, and 6 exceeded 85% A-sub(1) responding. Analysis of negative recency effects for Groups 1-4 suggested that Groups 1 and 4 were not responding to the sequential nature of the task, whereas Groups 2 and 3 were." (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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