Discussion centered on three sets of factors that may influence the variability observed in "concept identification" (concept formation and discrimination learning) studies: stimulus characteristics, incentives employed, and subject characteristics. Stimulus characteristics are described in terms of the number of dimensions…

A STUDY, IN PROGRESS, IS ATTEMPTING TO DETERMINE THE INTERACTION OF VARIOUS REWARD CONDITIONS AND VARIOUS TYPES OF PRESCHOOL EXPERIENCE WITH DISCRIMINATION LEARNING. THE SUBJECTS ARE 240 4- AND 5-YEAR-OLD CHILDREN WITH THREE TYPES OF PRESCHOOL EXPERIENCE--1 TO 3 MONTHS OF HEAD START, 10 TO 12 MONTHS OF HEAD START, AND NO ATTENDANCE IN A PRESCHOOL…