Two five-week test-retest reliability studies of a measure of the unit of perception of ongoing behavior were conducted. In the first, 25 females and 23 males segmented a 7-minute action sequence under fine-unit or gross-unit instructional sets. Number of units marked at first viewing correlated .87 with number of units at retest. Correlations…

Competence in action perception seems to be achieved very early in life. Because research has indicated that competent perceivers of action must be able to discriminate breakpoints in behavior, then recognition memory for breakpoints should be superior to that for nonbreakpoints at all ages where competence in action perception exists. Two studies…