Synthesis of the contingent negative variation brain potential from noncontingent stimulus and motor elements

Science  06 Jun 1980:
Vol. 208, Issue 4448, pp. 1165-1168
DOI: 10.1126/science.7375925


Slow shifts in brain potential (commonly called the contingent negative variation), obtained during a warned reaction-time task with a foreperiod of 1 second, were compared with waveforms synthesized by the addition of separately obtained potentials associated with individual (nonpaired) sensory stimuli and self-initiated motor movements. The synthesized waveforms match closely the actual contingent negative variation, suggesting that it is constituted largely of separate, noncontingent elements related to sensory and motor processes.