Short-range vs long-range motion: not a valid distinction.

In our previous article (Cavanagh and Mather, 1989), we claimed that the reported differences between short-range and long-range motion phenomena are a direct consequence of the stimuli used in the two paradigms and are not evidence for the existence of two qualitatively different motion processes. In his comments, Petersik (1991) argues that although the distinctions between shortand long-range motion are fuzzier than originally claimed, the two motion processes remain a legitimate classification.

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