Test-retest, split-half, and parallel-form reliability estimates were obtained for the Vividness of Visual Imagery Questionnaire and the Gordon Test of Visual Imagery Control. Although the Vividness of Imagery questionnaire was internally consistent, its reliability over time and form was unsatisfactory. In contrast, the Gordon scale lacked internal consistency but was reliable over time and form.
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Kelvie et al. (1974) studied this question.
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