Absence of adaptive plasticity after voluntary vergence and accommodation

Subjects maintained their eyes crossed (verged) for a period of 8 min in darkness with monitoring provided by an infrared video system. Changes in resting vergence (RV) and resting focus (RF) were examined. Results showed: (i) visual stimulation was not necessary for adaptation of either RV or RF, b...

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Bibliographic Details
Published in:Vision research (Oxford) 1995-10, Vol.35 (19), p.2773-2783
Main Authors: Ebenholtz, Sheldon M., Citek, Karl
Format: Article
Language:English
Subjects:
Accommodation, Ocular - physiology
Adaptation, Ocular - physiology
Adaptive control system
Adult
Anatomical correlates of behavior
Behavioral psychophysiology
Biological and medical sciences
Convergence, Ocular - physiology
Fundamental and applied biological sciences. Psychology
Humans
Middle Aged
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Pupil - physiology
Pupil size
Rest - physiology
Resting focus
Resting vergence
Voluntary accommodation
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Summary:Subjects maintained their eyes crossed (verged) for a period of 8 min in darkness with monitoring provided by an infrared video system. Changes in resting vergence (RV) and resting focus (RF) were examined. Results showed: (i) visual stimulation was not necessary for adaptation of either RV or RF, but (ii) these purely motor effects were significantly smaller and more dissipative than those attributable to visually driven adaptation, and (iii) voluntary vergence amplitude was negatively correlated with pupil size. Assuming that voluntary vergence is driven by accommodation, then the voluntary signal must enter the oculomotor control system prior to the cross links between channels, but beyond the site of the visually driven adaptive elements.
ISSN:0042-6989
1878-5646
DOI:10.1016/0042-6989(95)00041-W