Size estimation was studied in 14 hospital aides and the following four groups of 14 male schizophrenics: acute good premorbid paranoid, acute poor premorbid nonparanoid, chronic good premorbid paranoid, and chronic poor premorbid nonparanoid. Unlike previous studies: (1) Ss were at optical infinity from the stimuli to eliminate possible micropsia or macropsia, and (2) stimuli were viewed with an artificial pupil. Contrary to previous findings, no significant differences occurred among the groups in level of size estimation. As in previous studies, the thematic content of the stimuli influenced size-estimation levels but this variable did not interact with subject classification.
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