An electronic apparatus for testing fatigue by the visual flicker method.

1 December 1942

journal article
research article
Published by American Psychological Association (APA) in Journal of Experimental Psychology

Vol. 31 (6) , 538-543
https://doi.org/10.1037/h0056019

Abstract

A gas-triode controls the flash rate and duration of a neon flicker lamp. Frequency is standardized with a small oscilloscope tube. The apparatus is noiseless, and gives a rapid detn. of the critical fusion frequency since the rate changes instantly. Preliminary expts. show high reliability (r=.99); [sigma]m for 10 tests is 0.1 cycle. The test-retest correlation with a 24 hr. interval is r=.91; the intercorrelation between r. and 1. eye is .95.

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