Abstract
ABSTRACTThis study was undertaken to determine those changes which take place in a number of psychophysiological measures as a function of time and repetition of experimental sessions.Eight male chronic schizophrenic patients served as subjects. They were seen twice weekly for a total of 12 30‐min sessions, during which continuous polygraph recordings and blood pressures at 3‐min intervals were obtained. Variables analyzed for this study were blood pressure, heart and respiration rates, skin conductance, finger pulse volume, and muscle tension. The data were treated by analysis of variance for between‐session (days) and within‐session (intervals) effects.The hypothesis of decreasing activation was sustained only for heart rate. No other variable showed systematic changes associated with successive test sessions.Auxiliary data suggests that the variables which reflect adaptation effects depend upon the laboratory, subject population, and frequency of measurement. It is concluded that except for the particular variable which shows a session‐to‐session adaptation effect, individual variability and measurement error remain as the major sources of test‐retest unreliability in the variables and population studied.
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