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Abstract
Jones’ (1972) theory relative to the superdiagonal form of a correlation matrix of repeated trials for a psychomotor task was evaluated for three tasks: pursuit rotor, stabilometer, and Rhythmic Analysis System. Results indicated no support for Jones’ statement that most complex psychomotor skills show increasing superdiagonal form. In fact only limited support was found for any type superdiagonal form. However, 8 to 10 trials did appear to be necessary for agreement between the dependent variables for both the pursuit rotor and stabilometer. In addition, a plateau in the acquisition curve for these two tasks on the time-dependent variable appeared after 8 to 10 trials.