Factor structure and test-retest reliability of the Polish version of the Clarity of Auditory Imagery Scale

Abstract

AbstractVividness of imagery usually refers to the degree of similarity between mental images and corresponding percepts of real objects. One of the recently developed questionnaires, proposed to measure the vividness of auditory imagery, is the Clarity of Auditory Imagery Scale (CAIS). The main goal of the present study was to assess the factor structure, internal consistency, and test–retest reliability of the Polish version of the CAIS. The study was conducted on musicians (N = 39) and non-musicians (N = 40) to establish differences between the two groups in the vividness (or more specifically, clarity) of their auditory images. A combination of the minimum average partial (MAP) test and parallel analysis (PA) was used as a method of establishing the number of factors and provided evidence that the CAIS is one factor questionnaire. Test–retest reliability was measured by the intraclass correlation coefficient (ICC) between the mean scores obtained in two measurements made over a one-week interval. The test–retest (ICC) obtained between two measurements equaled .85. The ICC value showed satisfactory stability of the measurement of the vividness of auditory images, at least for short time intervals. The internal consistency of the scale was also satisfactory (Cronbach’s α = .87). Summarizing, the psychometric properties of the Polish version of the CAIS indicate that the scale is a reliable measure of the vividness of auditory imagery. Vividness of auditory imagery measured by the CAIS was not influenced by sex or musical expertise factors.