Where Is Size in the Brain of the Beholder?

in Multisensory Research
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Despite advances in our understanding of how the brain represents visual space, it remains unresolved how the subjective experience of an object’s size arises. While responses in retinotopic cortex correlate with perceived size, this does not imply that those brain regions mediate perceived size differences. Here I describe how the percept of an object’s size could be generated in the brain and outline unanswered questions that future research should seek to address.

Where Is Size in the Brain of the Beholder?

in Multisensory Research

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References

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Figures

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    Contextual illusions in which the perceived size of objects differs from the physical size. (A) Ebbinghaus illusion. The size of the two blue circles is identical but the left one appears smaller. (B) Delboeuf illusion. The size of the two blue circles is identical but the left one appears larger. (C, D) Ponzo and tunnel illusion. The length of the two horizontal lines is identical but the top one appears longer. (E) By free fusing the left and right images, one should see two coins at different distances. The coin seen as closer to the observer should also appear larger. (F) Müller-Lyer illusion. The length of the two horizontal lines is identical but it appears longer in the top figure.

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    Interactions between the profile of contextual interactions between visual stimuli and the macroscopic surface area of V1. Each surface represents the V1 of an individual. The color code denotes the retinotopic organization (e.g., eccentricity). In an individual with a large V1 (top), the same amount of visual space is represented with a greater cortical territory than in an individual with a small V1 (bottom). The sombrero-shaped profile illustrates a putative center-surround profile of contextual interactions [e.g., the peak region may denote increases in perceived size while the troughs denote perceived shrinkage as suggested by Schwarzkopf and Rees (2013)]. If this effect is constant in terms of cortical space, for instance because it is mediated by intrinsic lateral connections in V1, in an individual with a small V1 the perceptual effect will extend farther in visual space (bottom left). Conversely, if the effect is calibrated to the retinotopic map, possibly because it is mediated by feedback connections from higher brain regions, the effect in visual space will be constant (bottom right) and therefore not correlated with V1 surface area. Yet for both kinds of effect the magnitude of the percept will be reflected by responses in V1 neurons.

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    Orientation exerts a strong influence on perceived location. The grating patches in all three panels are positioned on perfect circles. However, the orientation of each patch affects whether one perceives a circle (A), a square (B), or a diamond (C).

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