title: Preliminary evidence for diurnal fluctuations in visual imagery.
abstract: In a repeated measures design, the Vividness of Visual Imagery Questionnaire (VVIQ; Marks, 1973) was administrated to 10 participants each half hour in a single day between 8:00 and 20:00. The questionnaire was also administrated on four consecutive days following the original administration at 8:00, 14:00 and 20:00. These results were then fitted to a model with the superposition of two cosinusoidal functions. An analysis of the results suggested the coexistence of ultradian and circadian cycles in the determination of the vividness of visual imagery.
authors.affiliation: II Department of Psychiatry, Medical University of Warsaw, Warszawva, Poland. kokoszka@psych.waw.pl
authors.forename: A
authors.initials: A
authors.lastname: Kokoszka
authors.forename: J
authors.initials: J
authors.lastname: Domosławski
authors.forename: B
authors.initials: B
authors.lastname: Wallace
authors.forename: A
authors.initials: A
authors.lastname: Borzym
mesh_terms: D000204:Activity Cycles / Q000502:physiology*; D000328:Adult; D002940:Circadian Rhythm / Q000502:physiology*; D004538:Eidetic Imagery / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D011795:Surveys and Questionnaires