Abstract
A spectacle-mounted shuttering device, the Portable Liquid-crystal Apparatus for Tachistoscopy via visual Occlusion, based on light-scattering cholesteric liquid crystals, is introduced. Operating characteristics of the device are discussed with respect to the design objectives of comfort, switching speed, light transmission, light extinction, safety, and reliability. A number of practical research, clinical, and industrial applications of the spectacles as tachistoscope, stroboscope, and stereoscopic viewing apparatus are summarized.
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The device described here was developed at the TNO Institute for Perception in Soesterberg, The Netherlands. The author gratefully acknowledges the collaborative efforts of S. Burrij, Y. Hartmann, R. Ohmann, R. van der Horst, and P. Bakker of TNO; the suggestions of D. Reits of the University of Amsterdam Institute of Ophthalmology; and the very valuable information supplied by F. C. Saunders of the UK Royal Signals and Radar Establishment.
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Milgram, P. A spectacle-mounted liquid-crystal tachistoscope. Behavior Research Methods, Instruments, & Computers 19, 449–456 (1987). https://doi.org/10.3758/BF03205613
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DOI: https://doi.org/10.3758/BF03205613