COMPLETION EFFECTS AND ATTENTION IN HALLUCINATORY AND NONHALLUCINATORY PATIENTS AND NORMAL SUBJECTS


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Abstract

This investigation sought to determine the relation between completion effects, as one variety of non-object-bound phenomena, and hallucinations, as another, through the study of recently hallucinated patients in the acute phase of illness, and control groups of nonhallucinatory patients and normal subjects; attention, as a possible underlying process in non-object-bound phenomena, was also studied.Preliminary data indicate that hallucinatory individuals in the acute phase of illness show significant differences in perceptual and attentional behaviors, marked by greater tendency to completion effects, greater degree of attention error, and the notable lack of correlation between visual acuity and visual completion effects.Completion effects and attention did not appear to be related, at least within the range of attentional performance of the sample. Theoretical implications are discussed.

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