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Saccade onset and offset lambda waves: Relation to pattern movement visually evoked potentials

Thickbroom, G.W., Knezevicˇ, W., Carroll, W.M. and Mastaglia, F.L. (1991) Saccade onset and offset lambda waves: Relation to pattern movement visually evoked potentials. Brain Research, 551 (1-2). pp. 150-156.

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The lambda (λ) wave is an occipital EEG potential which occurs when saccadic eye movements are made against an illuminated contrast background. There is some disagreement concerning the presence of sub-components to the λ-wave, and its relationship to visually evoked potentials. In the present study, λ-waves were recorded with saccades of different durations (30–110 ms) and compared to VEPs associated with pattern movements of similar durations and velocity. It was found that the λ-wave consisted of a saccade onset component with positive sub-components at 59 and 100 ms after saccade onset, and a saccade offset component with a positive potential at 74 ms after saccade offset. With small saccades of 30 ms duration or less, these components superimposed to form a single λ-wave. In the case of pattern movement VEPs, a movement onset component of latency 110 ms following movement onset, and a movement offset component at 89 ms after movement offset, were identified. The similar behaviour of the λ-wave and VEP under these conditions supports the view that the λ-wave is a visually evoked potential resulting from movement of the visual field across the retina during a saccadic eye movement.

Item Type: Journal Article
Publisher: Elsevier BV
Copyright: © 1991 Published by Elsevier B.V.
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