Beta motion thresholds.

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Abstract
3 men and 2 women (normal Ss) were tested for beta motion thresholds with variations of interval and duration times from 5 to 100 msec. Ss were given preliminary training in beta motion perception for the purpose of avoiding naive judgments resulting from inability to distinguish true beta motion from other types of apparent motion. The apparatus consisted of the RCD4 Apparent Motion Unit, a specially built unit featuring 2 vertically mounted lights with various speeds of duration and interval time with discrete graduations as fine as 1 msec. The results show compliance with Korte's 4th law below 65-msec. values; interval time decreases as duration time increases. Above 65 msec. the values do not comply with Korte's law. As duration time is increased the function approaches an asymptote, indicating a failure of Korte's 4th law. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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