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Higher level influences on saccade generation in normals and patients with visual hemineglect

Published online by Cambridge University Press:  01 August 1999

Wolfgang Heide
Affiliation:
Department of Neurology, Medical University at Lübeck, D-23538 Lübeck, Germanyheidew@neuro.mu-luebeck.de www.neuro.mu-luebeck.de/fgheide.htm
Andreas Sprenger
Affiliation:
Department of Neurology, Medical University at Lübeck, D-23538 Lübeck, Germanyheidew@neuro.mu-luebeck.de www.neuro.mu-luebeck.de/fgheide.htm
Detlef Kömpf
Affiliation:
Department of Neurology, Medical University at Lübeck, D-23538 Lübeck, Germanyheidew@neuro.mu-luebeck.de www.neuro.mu-luebeck.de/fgheide.htm
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Abstract

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In this commentary we describe findings in normal human subjects and in patients with visual hemineglect that support the importance of higher-level influences on saccade generation during visual exploration. As the duration of fixations increases with increases in the cognitive demand of the task, the timing of exploratory saccades is controlled more by centers of cognitive and perceptual processing at levels 4 and 5 than by reflex-like automatic processes at level 3. In line with this, unilateral frontal eye field lesions impair systematic, intentional saccadic exploration of visual scenes, causing prolonged fixations and contralesional hemineglect, but leave visually triggered reflexive saccades largely intact.

Type
Open Peer Commentary
Copyright
© 1999 Cambridge University Press