Vergence-adaptive change with a prism-induced noncomitant disparity

Oculomotor adaptation to a magnified motor field in one eye can occur as a result of the vergence system responding either to (1) the magnification of the field, or (2) via small adaptive fields. This was investigated by monitoring adaptation with the whole oculomotor field magnified in one experiment, and just the central motor field magnified in another experiment. It was shown that adaptation in the periphery occurred at a much slower rate when it was occluded. It is concluded that adaptation in the periphery occurs via adaptive spread from central positions and not via a direct response to the magnification of the oculomotor field.