D. Papakostopoulos, ed. / Psychophysiologv Society abstracts 195 SLOW BRAIN POTENTIALS RELATED TO MOVEMENT AND VISUAL FEEDBACK IN A RESPONSE TIMING TASK E.J.P. DAMEN and C.H.M. BRUNIA Deparmwnt of Psychology, Physiological Psycholou Section, Tilhurg Unwersiry, The Neiherlands In a response timing task in which each keypress was followed by visual feedback with a delay of 4.5 set, Lacey and Lacey (1973) found no cortical slow potential shift at C, during the response-feedback interval. In the present experiment righthanded subjects (N = 40) had to press a button no sooner than 20 set since the last button press, and no later than 22 set (DRL 20” LH2”). After each response subjects were informed about the correctness of their timing by a LED display. Feedback delay was varied between groups, i.e. 2 set (Group I, N = 20) or 4 set (Group II, N = 20) after the response. Subjects performed one series with the left index finger and another with the right index finger. The order of the series was counterbal- anced across subjects. EEG was recorded from lateral precentral-, postcentral-, and parietal positions. EEG was averaged only over trials in which the vertical EOG did not exceed 60 pV. The preliminary results indicate that Bereitschaftspotential, which was most pronounced over the contralateral pre- and postcentral positions, preceded the button press. Irrespective of the response side there was an increasing slow negative wave over the right hemisphere positions during the response-feedback interval. However when the right index finger was used there was an additional negative potential over the left hemisphere, almost as large as the contralateral negative shift. Effects of feedback delay have not been evaluated yet. Reference Lacey, J.I. and Lacey, B.C. (1973). Experimental association and dissociation of phasic brady- cardia and vertex-negative waves: A psychophysiological study of attention and response intention. In: McCallum, W.C. and Knott, J.R. (Eds.). Event Related Slow Potentials of the Brain: Their Relations to Behaviour. Elsevier. Amsterdam, 281-285.

Slow brain potentials related to movement and visual feedback in a response timing task

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D. Papakostopoulos, ed. / Psychophysiologv Society abstracts 195

SLOW BRAIN POTENTIALS RELATED TO MOVEMENT AND VISUAL FEEDBACK IN A RESPONSE TIMING TASK

E.J.P. DAMEN and C.H.M. BRUNIA

Deparmwnt of Psychology, Physiological Psycholou Section, Tilhurg Unwersiry, The Neiherlands

In a response timing task in which each keypress was followed by visual feedback with a delay of 4.5 set, Lacey and Lacey (1973) found no cortical slow potential shift at C, during the response-feedback interval.

In the present experiment righthanded subjects (N = 40) had to press a button no sooner than 20 set since the last button press, and no later than 22 set (DRL 20” LH2”). After each response subjects were informed about the correctness of their timing by a LED display. Feedback delay was varied between groups, i.e. 2 set (Group I, N = 20) or 4 set (Group II, N = 20) after the response. Subjects performed one series with the left index finger and another with the right index finger. The order of the series was counterbal-

anced across subjects. EEG was recorded from lateral precentral-, postcentral-, and parietal positions. EEG was averaged only over trials in which the vertical EOG did not exceed 60 pV.

The preliminary results indicate that Bereitschaftspotential, which was most pronounced over the contralateral pre- and postcentral positions, preceded the button press. Irrespective of the response side there was an increasing slow negative wave over the right hemisphere positions during the response-feedback interval. However when the right index finger was used there was an additional negative potential over the left hemisphere, almost as large as the contralateral negative shift. Effects of feedback delay have not been evaluated yet.

Reference

Lacey, J.I. and Lacey, B.C. (1973). Experimental association and dissociation of phasic brady-

cardia and vertex-negative waves: A psychophysiological study of attention and response

intention. In: McCallum, W.C. and Knott, J.R. (Eds.). Event Related Slow Potentials of the

Brain: Their Relations to Behaviour. Elsevier. Amsterdam, 281-285.