Task demands and visual context naturalness modulate gravitational expectation during ocular tracking of temporarily occluded ballistic trajectories.

Instead, the opposite trends, whereby higher fractions of statistically significant comparisons occurred with different velocities and equal gravity conditions, were evident only with the post saccadic error during both perturbation and occlusion windows (p = 0.157 and p = 0.478, respectively) and with the SPEM gain during the perturbation window (p = 0.905), but they failed to reach statistical significance.

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Perturbations of the target acceleration affected significantly both saccadic and smooth pursuit movements, with ocular tracking indexes showing generally monotonic relationships with respect to the gravity level, which accounted for the highly significant main effects of this predictor ( Tables 2 - 3 ).

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