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Described a timer circuit which produces pulse durations ranging from .1-20,000 msec. The timer has high reliability, is inexpensive, and simple to construct.
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Presents data on visual discrimination of 2-pulse-interval differences.
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Discusses the rationale for a constant source of both luminance and illuminance to check photometer calibration. The inexpensive construction of such a reference source is described, and some performance data are given.
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Measured short-term memory for 16 monochromatic hues after 6 delays by means of an iterative, momentary stimulus-matching technique. Observers were 4 25-43 yr old males including the 1st author.
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