Psychophysical method, degree of heterophoria, and type of heterophoria (esophoria and hyperphoria) were studied as variables affecting the perception of beta motion in 25 male Ss and 25 female Ss. Esophoria was more disruptive of motion perception than hyperphoria, for all Ss, with the stimuli presented in a horizontal plane. The method of constant stimuli produced greater mean durations of perceived motion in the male Ss than the method of serial exploration but was non-significant for females. Degree of heterophoria did not significantly affect mean durations of perceived motion for either group, leading to the conclusion that beta motion is a highly stable phenomenon
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