Use of simple reaction time in motor programming studies: a reply to Klapp, Wyatt and Lingo.

Following a more explicit explanation of the 1960 memory-drum theory and the reasons for using the simple (rather than choice) RT method in testing predictions based on it, the eight experiments utilizing large-scale precued arm movements constrained as to directional accuracy are reviewed. In all cases, increasing complexity of the movement consistently increased response latency; control RT levels agreed with well-established typical values for auditory and visual stimuli. Following practice the complexity effect leveled off, retaining a significant latency differential. Results from experiments varying duration of a held movement position (with movement minimal and complexity invariant) are not relevant to these studies.