THE EFFECTS OF TIME POINT ALIGNMENT ON THE AMPLITUDE OF AVERAGED ORBITAL PRESACCADIC SPIKE POTENTIAL (SP)

Effects of two time-point selection averaging techniques on orbital SP amplitude were studied on 10 normal subjects performing horizontal sa ccades. One technique involved averaging from the SP peak, another tec hnique involved averaging from the saccadic onset. The time-point sele ction methods only affected the magnitude of SP amplitude but did not interact with experimental conditions, Repeated measures analysis of v ariance showed that SP amplitudes were higher in data aligned on SP pe ak than those aligned on saccadic onset (P < 0.01). No significant sec ond order (saccade by degree) or third order (saccade by direction) in teractions involving averaging method were found (P > 0.05).