Sustained representation of perspectival shape.

Proceedings of the National Academy of Sciences of the United States of America
Jorge MoralesChaz Firestone

Abstract

Arguably the most foundational principle in perception research is that our experience of the world goes beyond the retinal image; we perceive the distal environment itself, not the proximal stimulation it causes. Shape may be the paradigm case of such "unconscious inference": When a coin is rotated in depth, we infer the circular object it truly is, discarding the perspectival ellipse projected on our eyes. But is this really the fate of such perspectival shapes? Or does a tilted coin retain an elliptical appearance even when we know it's circular? This question has generated heated debate from Locke and Hume to the present; but whereas extant arguments rely primarily on introspection, this problem is also open to empirical test. If tilted coins bear a representational similarity to elliptical objects, then a circular coin should, when rotated, impair search for a distal ellipse. Here, nine experiments demonstrate that this is so, suggesting that perspectival shapes persist in the mind far longer than traditionally assumed. Subjects saw search arrays of three-dimensional "coins," and simply had to locate a distally elliptical coin. Surprisingly, rotated circular coins slowed search for elliptical targets, even when subjects cl...Continue Reading

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Jun 14, 2020·Proceedings of the National Academy of Sciences of the United States of America·Jorge MoralesChaz Firestone

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Citations

Jun 14, 2020·Proceedings of the National Academy of Sciences of the United States of America·Jorge MoralesChaz Firestone
Feb 11, 2021·History and Philosophy of the Life Sciences·Louise Daoust
Feb 25, 2021·Proceedings of the National Academy of Sciences of the United States of America·Paul Linton
Jul 11, 2021·Proceedings of the National Academy of Sciences of the United States of America·Jorge MoralesChaz Firestone

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