Two types of intralist similarity were investigated in 4-choice verbal discrimination learning of nonsense syllables and forms. Similarity among the four items of a display retarded learning a small amount or not at all. However, similarity of items among displays greatly retarded learning in all situations as compared to a control of minimal similarity. Presentation of displays of stimuli by the anticipation method, by the study-test method, or by presentation of the "correct" stimulus alone during the study phase of study-test method, influenced speed of learning also, listed in order of increasing speeds of learning.
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