Salisbury, Dean FRutherford, BretShenton, MarthaMcCarley, Robert William2016-09-152001Salisbury, Dean F, Bret Rutherford, Martha E Shenton, and Robert W McCarley. 2001. “Button-Pressing Affects P300 Amplitude and Scalp Topography.” Clinical Neurophysiology 112 (9) (September): 1676–1684. doi:10.1016/s1388-2457(01)00607-1.1388-2457http://nrs.harvard.edu/urn-3:HUL.InstRepos:28520167Background: Scant and equivocal research exists examining the effects of button-pressing on P300. Button-pressing may decrease P300 latency and amplitude. The melding of motor potentials and P300 may also confound studies of P300 topography, such as studies of temporal scalp-area asymmetries in schizophrenia. Method: P300 was measured on button-press and silent-count tasks in control subjects. An estimate of motor activity was constructed from a simple reaction time task, with reaction times matched to the button-press task. The motor estimate was subtracted from the button-press P300 to assess Kok’s (1988) additive model. Lastly, lateral P300 from schizophrenia patients was compared with each condition’s P300. Results: P300 was smaller and its topography different in the button-pressing task relative to silent-counting. The motor-correction procedure generated a P300 with normal topography. Comparison of the button-press P300 in controls to the silent-count P300 in schizophrenia patients reduced a significant lateral asymmetry to trend level. This asymmetry was significant after the correction procedure. Conclusions: Button-pressing generates smaller P300 than silent-counting. Also, P300 topography in button-pressing tasks is confounded by motor potentials. The distortion can be corrected with a motor potential estimate. Motor potentials can occlude differences in P300 topography between groups.en-USbutton-presscorrection procedureevent-related potentialsmovement-related potentialP300topographyJournal Article2016-09-1510.1016/s1388-2457(01)00607-1