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First, we found that a monocularly trained bias was equally resistant to reversal in the trained eye and the untrained eye, suggesting that the site of learning is at, or follows, the site of binocular combination. We investigated the substrates of perceptual learning for bistable structure-from-motion stimuli by first inducing a directional bias, then examining whether changing single stimulus parameters affected the efficacy of counter-training to reverse this initial bias. Visually ambiguous stimuli are often used to study perceptual learning, but little is known of the neural mechanisms involved. We also report test–retest reliabilities based on a randomly selected subset of 100 participants. We report the distribution of directional biases observed in this sample, as well as their correlation with measures of handedness, ocular dominance and ideational type. In a follow-up study, we tested 1000 participants using the structure-from-motion stimulus.

Biases were highly correlated between the two stimulus types, though we found some evidence that the initial frame of the pirouetting dancer animation could influence perceived direction on a given trial.

This bias was consistent between presentation locations for most participants, but a minority reliably showed an opposite bias in the two hemifields. Nearly all participants showed a robust directional bias across two testing occasions. Twenty participants reported the perceived direction of rotation of structure-from-motion cylinders and silhouettes of a pirouetting dancer presented briefly to the left or right of fixation. We demonstrate a reliable perceptual polymorphism for a class of ambiguously rotating stimuli.

Konig 2d to 3d video converter screen shots