Development of a new Clarity of Auditory Imagery Scale.

In the psychological study of auditory imagery, instruments for measuring vividness or clarity have existed for some time. The present article argues that existing scales are ambiguous, in that clarity and vividness of auditory imagery are addressed simultaneously, and that empirical validations of those scales suffer from inadequate methods. The aim of the present study was to develop a new psychometric scale, the Clarity of Auditory Imagery Scale, measuring individual differences in clarity of auditory imagery. Drawing on previous literature, 16 items were generated, forming an initial item pool that was presented to 212 respondents. The hypothesized single dimensionality inherent in the data was confirmed using Velicer's (1976) minimum average partial test and parallel analysis. Also, data were factor analyzed, extracting a stable one-factor solution including all 16 items. The internal consistency of the final scale was satisfactory (coefficient alpha = .88). Other properties of the questionnaire, such as test-retest reliability, remain to be established.