READINESS POTENTIALS RELATED TO SELF-INITIATED MOVEMENT AND TO MOVEMENT PRECEDED BY TIME-ESTIMATION - A COMPARISON

Two procedures for eliciting premovement potentials were compared: (1) the estimation of a 3 s interval elapsed after a warning auditory sig nal, and (2) classical ''self-pacing''. Eleven healthy right-handed su bjects participated in the experiment, EEG records from scalp electrod es placed at C-z, C-3+ and C-4+ were analyzed. It has been shown that both procedures induced similar premovement potentials except that in the first procedure the early component of the potential was longer. T he time estimation itself induced a negative slow potential consisting of a rapid set-up and a subsequent plateau.