Abstract

According to Hierarchical editor, or HED model, choice reaction time depends on structure of motor program, position of uncertain response, and length of movement sequence. The present study investigated the assignment processing of hand and finger parameters under the condition in which subjects performed one of two memorized finger sequence. The position of uncertain response affected on response initiating time(T1).

However Rosenbaum, Inhoff, and Gordon(1984) claimed that the number of feature to be edited does not affect on choosing time, but in the present study, T1 was shorter when hand parameter had been set and finger parameter had been uncertain than when hand and finger parameter had been uncertain. But T1 was not shorter when finger parameter had been set and hand parameter had been uncertain that when hand and finger parameter had been uncertain. This result is consistent with Rosenbaum et al. (1984)’s result.

These results suggest that hand parameter is independently edited with finger parameter and is determined before finger parameter is. In other words, hand parameter decision is occurred on higher element than finger parameter decision. On the one hand, to-be-edited feature did not affect on interresponse time. This result derived from the fact to-be-edited feature did not change the number of element for subprogram.