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This study explored the effects of availability to S of 2 types of stimulus instances, correctly and incorrectly sorted, on performance in a 4-choice concept-learning task. Errors to problem solution were reduced by the availability of 1 instance in each of the 4 response categories. Additional instances beyond 1 had no appreciable effect. Performance when only incorrectly sorted instances were exposed was unaffected by availability. There was no significant interaction between number and type of available instances.

270 Ss between ages 10 and 18 yr. participated in a study exploring the effects of 3 levels of availability of correctly and incorrectly sorted instances in a 4-choice concept-learning task. Errors were reduced with availability of 1 and 2 past instances and increase in age. Performance was unaffected by availability of only incorrect instances. Significant interaction between type and number of instances was found. Sex significantly interacted with number and type of instances available, demonstrating superior performance of females.

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