title: How the brain makes the world appear stable.
abstract: Space constancy, the appearance of a stable visual world despite shifts of all visual input with each eye movement, has been explained historically with a compensatory signal (efference copy or corollary discharge) that subtracts the eye movement signal from the retinal image shift accompanying each eye movement. Quantitative measures have shown the signal to be too small and too slow to mediate space constancy unaided. Newer theories discard the compensation idea, instead calibrating vision to each saccadic target.
authors: Department of Psychology, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; e-mail:  bruceb@ucsc.edu.
authors: Bruce
authors: B
authors: Bridgeman
keywords: corollary discharge; efference copy; space constancy; spatial orientation; vision
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