Abstract
Psychological experiments in mental rotation and pattern recognition often require the presentation of stimuli in a variety of different orientations. Traditionally these stimuli have been presented with a tachistoscope; however, there are several advantages to using a system that presents such stimuli on a microcomputer. Unfortunately, in a typical experiment of this type, stimuli are presented after several different rotations, reflections, and translations, making the computerized representation of all the different permutations time- and memory-consuming. This paper describes a method of representation, utilizing a modified polar coordinate system, which allows for the efficient storage and transformation of such stimuli.
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Thanks to Geoff White, Barry Dingwall, Russell Phillips, and the anonymous reviewers for their assistance.
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Bilkey, D.K. A procedure for the computerized representation and presentation of rotated and reflected stimuli. Behavior Research Methods, Instruments, & Computers 19, 419–421 (1987). https://doi.org/10.3758/BF03205610
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DOI: https://doi.org/10.3758/BF03205610