Accession Number : AD0648447

Title :   SAME-DIFFERENT JUDGMENTS AND THE PSYCHOLOGICAL REFRACTORY PERIOD.

Descriptive Note : Technical rept.,

Corporate Author : MCGILL UNIV MONTREAL (QUEBEC) DEPT OF PSYCHOLOGY

Personal Author(s) : Corballis,Michael C. ; Lieberman,William ; Bindra,Dalbir

Report Date : FEB 1967

Pagination or Media Count : 30

Abstract : Four sets of paired visual stimuli (OO, XX, XO, or OX) were judged by 48 Ss to be either 'same' or 'different.' Decision latencies of the same and different judgment were studied as a function of the interstimulus interval (ISI). In Experiments I and II, in which stimulus durations were 70 msec., decision latencies showed marked increases when the ISI was reduced to 100 msec., but in Experiments III and IV, in which the stimulus durations were only 40 msec., comparable increases did not occur until the ISI was reduced to 50 msec. These increases were more marked for 'same' than for 'different' judgments, although overall decision latencies were generally shorter for 'same' judgments. The effects of varying ISI's and stimulus durations are interpreted in terms of masking; the possibility of central intermittency as a cause of increased latencies in other experiments is left open. (Author)

Descriptors :   (*DECISION MAKING, PERFORMANCE(HUMAN)), REACTION(PSYCHOLOGY), REFLEXES, STIMULATION(PHYSIOLOGY), MOTOR REACTIONS, CANADA

Subject Categories : Psychology

Distribution Statement : APPROVED FOR PUBLIC RELEASE