Abstract

16 naive and 16 experienced Ss completed a ganzfeld ESP (GESP) free -response test session using pictorial targets. 16PF scores and questionnaire data on mood, expectancy, and motivation were available for the Ss, who were requested to classify the bias of their responses. The overall scoring rate was significantly above chance, with experienced Ss showing an independently significant deviation. After transcripts were divided into 2 halves with an equal number of responses in both, only the transcript material from the 2nd halves of the sessions showed psi-hitting at a significant level. This effect was independently significant only for naive Ss. Data do not support predictions concerning auditory imagery and extraversion. Although response-bias effects (insignificant) were present and more low-bias responses occurred later rather than earlier in the session, techniques were too crude to explore R. G. Stanford's (1978) model of GESP optimization. Scoring on responses labeled "clear" and "not clear" differed significantly, but the direction of the effect was opposite for the naive and experienced Ss. (20 ref)