Abstract
Three disadvantages of the usual projection tachistoscope are discussed. Because of low mechanical precision, stimulus alignment is difficult. Because of rather low focal distances of the projection lenses, the stimuli provide visual angles that are often larger than desired, and the photographic shutters are noisy, are relatively inert, and have a limited service life. A new construction is described that avoids these disadvantages with a modified configuration of commercial elements: stable and precise mounting of the single channels, a double-lens projection system, and a noiseless, fast mechanical shutter based on a limited-rotation motor.
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The development of the instrument described here was financially supported by Grant Gl 121/1 of the Deutsche Forschungsgemeinschaft. I am indebted to Hugo Kehrer and Gerhard Schnerr, the chiefs of the mechanical and electronics workshop of the Psychological Institute at Tübingen. They designed and manufactured the mechanical mounting of the instrument and the electronic driver for the shutter. The help of Sally Bellows in answering questions concerning English usage is gratefully acknowledged.
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Glaser, W.R. Technical improvements to the projection tachistoscope. Behavior Research Methods, Instruments, & Computers 20, 491–494 (1988). https://doi.org/10.3758/BF03202702
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DOI: https://doi.org/10.3758/BF03202702