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Saccade-contingent spatial and temporal errors are absent for saccadic head movements.

Jackson, S. R. and Newport, R. and Osborne, F. and Wakely, R. and Smith, D. and Walsh, V. (2005) 'Saccade-contingent spatial and temporal errors are absent for saccadic head movements.', Cortex., 41 (2). pp. 205-212.


Psychophysical studies extending over a thirty-year period have repeatedly demonstrated that visual stimuli presented close to the onset of a saccadic eye movement are mislocalised both spatially and temporally. When post-saccadic visual references are available, this spatial distortion is best characterised by a compression of visual space toward the target of the saccadic eye movement. An important but unresolved issue, concerns the specificity of saccade-dependent visual mislocalisation phenomena. We investigated this by examining whether saccade-dependent spatial and temporal mislocalisation are observed in an individual (A.I.) who cannot make any form of eye movement (opthalamoplegia), but compensates when reading or scanning visual scenes by making saccadic head movements. We demonstrate that saccade- dependent spatial and temporal mislocalisation are absent in subject A.I. and suggest that spatiotemporal mislocalisation may be specific to rapid forms of movement, such as ocular saccades, that necessitate predictive re-mapping to maintain space constancy.

Item Type:Article
Keywords:Saccades, Saccadic head movements, Saccadic remapping, Parietal cortex.
Full text:Full text not available from this repository.
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Date accepted:No date available
Date deposited:No date available
Date of first online publication:April 2005
Date first made open access:No date available

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