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Short answer Ambiguous figures do not necessarily depend on focus, they do depend on attention though. Background The figure you provide is huge. From a standard face-to-monitor distance of a meter or so, one indeed needs to scan the image. Under these conditions I agree with you, in that the perceived animal changes when you change focus. The ears become a ...


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As Bryan Krause indicates in the comments, the statement that 'One third of the cortical surface is dedicated to vision processing' is disputable. Especially given that fact that there's evidence that even the primary visual cortex is involved in multimodal processing (MacPherson, 2018). Nonetheless, it is a valuable statement as it makes clear that a lot of ...


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Ocular dominance columns are not purely monocular, nor are simple cells purely monocular. Simple and complex cells both exhibit a range of ocular preference, from preferring one to the other. See this figure from Hubel and Wiesel, 1962: Hubel, D. H., & Wiesel, T. N. (1962). Receptive fields, binocular interaction and functional architecture in the cat'...


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Here’s an image I found that triggers tristable perception (as opposed to just bistable perception): The three possible interpretations are A big cube with a smaller cube in front of it A big cube with a small cubical chunk missing A room with a small cube sitting in the corner Apparently there is a fourth possible interpretation, but it is so “unlikely” ...


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According to these three published studies I found below - reaction time is slower when depth disparity information is withheld, as to whether or not that extra information is actually encoded in the brain is still an open question. This first paper by Young Lim Lee; Jeffrey A. Saunders used left and right eye rendered images of novel 3D shapes with and ...


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Yes there is evidence of the encoding of surface slant in the visual field Disparity-Based Coding of Three-Dimensional Surface Orientation by Macaque Middle Temporal Neurons We now show that MT contains robust, disparity-based signals regarding the 3-D orientation (tilt and slant) of planar surfaces. This tilt selectivity does not result from ...


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The primary visual cortex is topographic, which means that specific parts of that brain region correspond exactly to specific parts of your visual field. In order to prove that a scotoma (literally a blind spot in your vision) is due to dysfunctional neurons, all you need to do is show that the neurons responsible for that spot in your vision are not working ...


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20-30% vision. See Sheth & Young (2016) which cites Van Essen (2003). 27% vision, 8% auditory (Van Essen, 2003) I have seen some earlier references that say 50%. I think this derives from two factors. First, it is 50% in Macaque (see above ref 1). Second, my feeling (I haven't dug into this in enough detail to conclusively state it, so please don't ...


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A newborn baby has difficulty focusing its eyes or telling the difference between two objects presented to it. A baby learns to recognise its mothers face within the first week after birth, long before it can recognise objects that are not faces. They already show a preference for face-like visual stimuli while in the womb. The Human Fetus ...


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Short answer According to a study by Boutsen et al. Thatcherization of objects (houses in this study) did not reveal the Thatcher effect, while faces did. Background The Thatcher-face illusion (Fig 1) is, in my opinion, not really an illusion. Instead, it is a phenomenon where in-congruent features are more apparent when observed in their normal everyday ...


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It could also be visual snow. I see 'visual static' even in bright lighting. Shot noise cannot explain visual static under bright lighting in which there are too many photons for statistical fluctuations in their detection to be perceived.


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