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Principles of Frontal Lobe Function$
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Donald T. Stuss and Robert T. Knight

Print publication date: 2002

Print ISBN-13: 9780195134971

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780195134971.001.0001

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Cortical Control of Visuomotor Reflexes

Cortical Control of Visuomotor Reflexes

Chapter:
(p.149) 9 Cortical Control of Visuomotor Reflexes
Source:
Principles of Frontal Lobe Function
Author(s):

Robert Rafal

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195134971.003.0009

This chapter uses eye movements as a model system to investigate how midbrain reflex circuits and frontal and parietal systems for eye movement control combine to produce goal-directed behavior. Converging evidence from patients with midbrain lesions and from hemianopic patients reveals that midbrain pathways are responsible for reflexive orienting in humans. The visual grasp reflex (VGR) mediated by the colliculus is modulated by a dynamic interaction between cortical and subcortical systems. Chronic lesions of the frontal eye field (FEF) cause a slowing of visually guided saccades toward the ipsilesional field; whereas parietal lesions cause a bias against making voluntary saccades toward the contralesional field. The FEF and parietal lobes appear to normally have opposing influences on collicular function: the parietal lobe facilitates the VGR and the FEF inhibits it.

Keywords:   visual grasp reflex, eye movements, visuomotor control, frontal eye field, midbrain reflex circuits

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