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October 2021

Disposition towards hallucination and subjective versus objective vividness of imagery in normal subjects

Author(s): Bocker, K. B. E., deHaan, E. H. F.

Journal/Book: Pers Indiv Differ. 1999; 27: the Boulevard Langford Lane, Kidlington, Oxford Ox5 1GB, England. Pergamon-Elsevier Science Ltd. 707-714.

Abstract: In the present study we investigated the relation between subjective and objective indices of vividness of imagery and disposition towards hallucination in 74 college students. Self-reported imagery vividness was measured with the visual and auditory subscales of the Betts QMI Vividness of Imagery Scale. The objective task concerned the difference between a perceptual and an imagery condition of judgment of visual similarity of named objects. In addition, subjects completed a hallucination questionnaire (the Launay-Slade Hallucination Scale). After assigning subjects to a high and a low scoring group on the basis of scores on the hallucination scale, analysis of variance revealed a significant interaction between group and the two vividness of imagery measures. Subjects reporting hallucinatory experiences tended to show higher imagery vividness ratings on the Betts Scale than nonhallucinating subjects. In contrast, the reverse relation was found on the experimental imagery task. Implications of these findings for the validity of self-report imagery vividness measures are discussed. Directions for future research are outlined.

Note: Article Aleman A, Univ Utrecht, Dept Psychon, Psychol Lab, Heidelberglaan 2, NL-3584 CS Utrecht, NETHERLANDS


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