Detectability of relative motion as a function of exposure duration, angular separation, and background.

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Abstract
Used a signal detection design to measure detection thresholds for the motion of 1 spot of light relative to a stationary spot. Ss were 30 college students. Angular separations from 7.5 sec to 2., exposure durations from .5 to 4 sec, and inward and outward motion were used with and without a textured background. An increase in angular separation lowered thresholds measured in minutes of arc/sec. Increases in exposure duration lowered motion thresholds, but raised the total angular distance moved during exposure. Textured background had no effect. Results are related to previous findings and to following another automobile at night. (26 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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