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Instructions and the A and E effects in judgments of the vertical.

Subjects adjusted a line in the median plane to the gravitational vertical while they were upright (0 deg) or tilted backward (25 or 75 deg) and under 'objective' or 'apparent' instructions. The objective instructions significantly reduced the A effect in one experiment and virtually eliminated it in another, but did not alter the E effect. The E effect is discussed as an elevation illusion attributable to ocular counterrolling, the A effect as an undercompensation in orientation constancy.