A Group Test of Perceptual Acuity

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Abstract
A continuing need in psychological appraisal is for instruments free of educational, linguistic, or experiential bias. The perception of form and geometric properties of figures (e.g., length, width, and area) is a universal phenomenon and hence an inviting domain for study. A group test of accuracy of visual perception was developed, utilizing 25 illusions (e.g., those of Baldwin, Delbouf, Mueller-Lyer, Poggendorff, Ponzo, and Sander) and 5 non-illusions, presented by means of lantern slides. In college ( N = 205) and grade school ( N = 732) samples, acceptable internal reliability was demonstrated, and in the grade school sample an age-developmental gradient ( r = .25) was discernible. The 30-item Perceptual Acuity Test is brief (testing time 20 min.), easy to administer, and favorably received by most respondents.

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