This study investigated the acquisition of repeated shifts of simple discriminations (RSSD) in three infants. Animated images were presented on a touch sensitive screen. The procedure started off with a two-choice simple discrimination training (SD) with shifts in the stimulus function until all stimuli had functioned once as S+ and once as S-. Afterwards, all the three stimuli were presented in the same trial completing a RSSD cycle. Two of the infants learned the RSSD with the two-choice procedure and one infant learned the SD with two stimuli. The replacement of the stimulus sets throughout the training, characterized as a multiple exemplar training, seems to have contributed to the infants' engagement in the task as well as to the acquisition of the discriminations.
symbolic repertoire; simple discrimination; conditional discrimination; infants
