Forced revision during transcription was brought about by having the text change suddenly at a preset distance ahead of the current motor output. The adaptiveness of the motor system to change was studied as a function of this trigger distance. Two out of five typists tested were able to assimilate the change with minimum disruption of typing fluency. The timescale of revision by these two appears to be within earlier estimates of the time course of motor programming in normal conditions. It shows some sensitivity to syntax, being larger if the change was triggered within the word rather than in the previous word.
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