Neurophysiological correlates of mental arithmetic

Author(s): Lutzenberger, W., Birbaumer, N., Rickard, T. C., Bourne, L. E.

Journal/Book: Psychophysiology. 1996; 33: 1010 Vermont Ave NW, Suite 1100, Washington, DC 20005. Soc Psychophysiol Res. 522-529.

Abstract: Thirteen subjects were extensively trained on nine multiplication problems varying in difficulty. Practice was associated with a reaction time speed up and an attenuation of the problem size effect. The introduction of previously unpracticed problems led to a performance rebound to pretraining levels, indicating practice specificity. The event-related potentials were characterized by a late positive complex, followed by a positive slow wave. Offset latency of positive slow wave and preresponse amplitude at parietal electrodes showed practice specificity effects that systematically changed with practice and problem size, indicating an association with the load imposed on working memory. The peak of the late positive complex probably reflects task learning or adaptation effects because it was attenuated by practice predominantly at frontal electrodes, showed no practice specificity, and was not affected by problem size.

Note: Article P Pauli, Univ Tubingen, Inst Med Pscycol & Verhaltensneurobiol, Gartenstr 29, D-72074 Tubingen, Germany

Keyword(s): mental arithmetic; human calculator; event-related potentials; late positive complex; positive slow wave; practice; EVENT-RELATED POTENTIALS; FUNCTIONAL CATEGORIZATION; MULTIPLICATION SKILL; SLOW WAVES; LOCALIZATION; AREAS; EEG

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