Suppression of displacement in severely slowed saccades

Severely slowed saccades in Spinocerebellar ataxia have previously been shown to be at least partially closed-loop in nature, their long duration means that they can be modified in-flight in response to intrasaccadic target movements. In this study, a woman with these pathologically slowed saccades...

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Bibliographic Details
Published in:Vision research (Oxford) 2000-01, Vol.40 (24), p.3405-3413
Main Authors: MacAskill, Michael R, Anderson, Tim J, Jones, Richard D
Format: Article
Language:English
Subjects:
Adolescent
Adult
Biological and medical sciences
Case-Control Studies
Degenerative and inherited degenerative diseases of the nervous system. Leukodystrophies. Prion diseases
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Female
Humans
Male
Medical sciences
Middle Aged
Neurology
Psychomotor Performance - physiology
Saccades - physiology
Saccadic suppression of displacement
Slowed saccades
Spinocerebellar ataxia
Spinocerebellar Ataxias - physiopathology
Visuomotor control
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Summary:Severely slowed saccades in Spinocerebellar ataxia have previously been shown to be at least partially closed-loop in nature, their long duration means that they can be modified in-flight in response to intrasaccadic target movements. In this study, a woman with these pathologically slowed saccades could modify them in-flight in response to target movements, even when saccadic suppression of displacement (SSD) prevented conscious awareness of those movements. Thus, SSD is not complete, in that it provides perceptual information that is sub-threshold to consciousness but which can still be effectively utilised by the oculomotor system.
ISSN:0042-6989
1878-5646
DOI:10.1016/S0042-6989(00)00194-2