Abnormalities of coherent motion processing in strabismic amblyopia: Visual-evoked potential measurements

Coherent motion responses of patients with mild to moderate strabismic amblyopia were compared to those of normals using visual-evoked potentials (VEPs). Responses were elicited by dynamic random-dot kinematograms that alternated at 0.83 Hz between globally coherent (left-right) and incoherent (rand...

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Bibliographic Details
Published in:Journal of vision (Charlottesville, Va.) Va.), 2008-04, Vol.8 (4), p.2.1-212
Main Authors: Hou, Chuan, Pettet, Mark W, Norcia, Anthony M
Format: Article
Language:English
Subjects:
Adolescent
Adult
Aged
Amblyopia - complications
Amblyopia - physiopathology
Contrast Sensitivity - physiology
Evoked Potentials, Visual - physiology
Eye Movements - physiology
Female
Follow-Up Studies
Humans
Male
Middle Aged
Motion Perception - physiology
Photic Stimulation
Strabismus - complications
Strabismus - physiopathology
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Summary:Coherent motion responses of patients with mild to moderate strabismic amblyopia were compared to those of normals using visual-evoked potentials (VEPs). Responses were elicited by dynamic random-dot kinematograms that alternated at 0.83 Hz between globally coherent (left-right) and incoherent (random) motion states. Tuning curves were measured at the first harmonic of the global motion update rate (0.83 Hz) and at the first harmonic of the dot update rate (20 Hz) for spatial displacements 3.1 to 27.9 arcmin (1.6 to 9.3 deg/s). Responses locked to the changes in the global organization of the local direction vectors were an inverted U-shaped function of displacement/speed in the normal-vision observers and in the fellow eyes of the strabismus patients while the tuning function of the amblyopic eyes was shifted to larger displacements/higher speeds. Responses at the dot update rate were reduced in amplitude and altered in timing in both eyes of the patients. The results are consistent with both local and global deficits in motion processing in strabismic amblyopia.
ISSN:1534-7362
1534-7362
DOI:10.1167/8.4.2