Two stimuli of either small or capital letters were presented successively by tachistoscopic projectors. College students serving as subjects were requested to respond "yes" if the first stimulus (only one letter) was physically identical to or the same name of one of the letters in the second stimulus. The display size of the second stimulus was…

The effects of types of both memorized items and probes (digit, word, and dot pattern), using Sternberg's character-recognition procedure, were studied. Reaction time (RT) was a linear function of the set size of memorized items consistent with a serial search model. Response type (positive or negative) affected the encoding time (intercept of RT…