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Rodgers W A, Mayhew J E, Frisby J P, 1975, "A simple apparatus for measuring visual illusions of orientation" Perception 4(4) 475 – 476
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A simple apparatus for measuring visual illusions of orientation

William A Rodgers, John E Mayhew, John P Frisby

Received 21 July 1975

Abstract. Simple apparatus for measuring a wide range of visual illusions of orientation and suitable both for teaching and research is not easy to produce. This is particularly regrettable at the present time as far as teaching is concerned, in view of the vigorous research literature relating to such illusions. We describe here a device which can be manufactured economically on a large scale by a modestly equipped workshop, and which can be used to study both simultaneous and successive orientation illusions in a systematic fashion (allowing, for example, psychophysical functions to be plotted relating size of illusion to orientation of an inducing figure). The apparatus is small, robust, and portable, so that students can use it outside the laboratory, and its general-purpose nature enables students to carry out projects of their own design.

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