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Differential Topography of Human Eye Movement Potentials Preceding Visually Triggered and Self-Initiated Saccades

1980; Elsevier BV; Linguagem: Inglês

10.1016/s0079-6123(08)61626-x

1875-7855

Diane Kurtzberg, Herbert G. Vaughan,

EEG and Brain-Computer Interfaces

This chapter discusses differential topography of human eye movement potentials preceding visually triggered and self-initiated saccades. During normal vision the external world is scanned by a sequence of eye movements that occur from 2 to 5 times/sec. Input of the visual image is accomplished during the intervening fixations. The factors that enter into the programming of each saccade are complex, including visual information from the preceding fixation, changes in visual, auditory and somesthetic input and internally generated cognitive demands as well. Scalp recordings of potentials associated with self-initiated saccades in human subjects show activity that precedes the eye movements. Twelve normal adults are studied. A midline and left parasagittal electrode montage comprising 12 electrodes spanned the head from the mid-frontal (Fz) to the occipital region (Oz) so as to encompass the region of the classical frontal and posterior eye fields. Electroencephalography (EEG) is conventionally recorded with bandpass of 0.3–70 Hz and averaged in synchrony with the onset of saccades.