Abstract
The P-F Study was given to three groups of incarcerated delinquents categorized as to parole evaluation status. The hypothesis tested was that those Ss who were being evaluated for parole would give significantly fewer extrapunitive (E) responses than matched Ss who were not being evaluated for parole. Statistical analyses of the data supported the hypothesis.
It was suggested that the probability of external reinforcement may be a basic determinant of responses to the P-F Study and perhaps to projective tests generally.