Questions tagged [vision]
For questions regarding the visual system, which serves to transduce light energy into neural impulses, or regarding visual perception, how we interpret such incoming visual information.
278 questions
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What is "visual closure"? [duplicate]
Years ago I attended a lecture by an expert in dyslexia, and she said that dyslexia can be caused by a defect in what she called "visual closure", which she described as the ability to fill ...
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3 votes
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What shapes belong in a maximally distinguishable shapes palette?
This question is a follow-up to a question I asked on StackOverflow. The TL:DR is that, in a recent review by Franconeri et al. (2021), several papers are summarized that collectively reach the ...
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5 votes
1 answer
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How is it possible 1-year-olds perceive but don't distinguish colors?
Both articles and visualizations found on the web are in agreement that by 6 months, children's color perception is very close to that of adults (see image by Katrina Furth). Yet, the ability to name ...
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Can pressure on the Ganglion nerve cause temporary blindness in one eye [closed]
There is a hemangioma tumor behind the back of my Mom's throat, moving the uvula to one side. Some internet evidence would indicate that it is possible for the pressure that this tumor put on the ...
1 vote
1 answer
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are there any rigorous methods to do psychophysics!
Are there any rigorous methods for conducting psychophysics experiments (beyond just repeating the same task endlessly)? Specifically, are there adaptive control techniques that can be applied—...
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2 votes
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Where to find high-level overview of the current status of the 'Problem of Universals', viz. numerosity and cortical models?
The Problem of Universals in philosophy refers to the epistemology (our apprehension) and metaphysics (the existence) of universal forms. A key example is, of course, the perception of number, or ...
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1 answer
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What would our brain perceive if ONLY one photoreceptor is stimulated?
I only studied science till my high school but there is this one question I always wandered about is that Can we see very tiny objects like molecules in isolation(i.e let's say a single molecule and ...
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68 views
Why do evenly spaced colors have varying hue differences?
When looking at a color wheel with evenly divided colors in RGB/HSV/etc. the difference between them seems to vary a lot. For instance, the difference between Violet and Magenta seems so much more ...
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gamma correcting a sinusoidal grating [psychophysics]
I am developing a stimulation setting wherre I present a sinusoidal grating to a subject. Because of the monitor gamma expansion by a factor of 2.2, I need to gamma compress my sinusoidal grating by a ...
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3 votes
1 answer
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Can a blind-from-birth individual experience vision or visual imagery during a Near-Death Experience (NDE)?
I recently watched a testimony in which a blind-from-birth individual described two NDEs they had had in which they supposedly were able to see with 20/20 vision (inside the NDEs). The person ...
user34126
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Functional/Cognitive Acuity/Manipulability
I'm trying to find an existing construct for what I refer to in my research as "Functional Acuity" (hereafter FA). The concept of FA is analogous to what one can see with v w/o one's glasses....
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Is the retinal image a picture? [duplicate]
I have some books on visual perception in which the retinal image in the human eye is described and represented (in pictures) as a "picture" or "visual representation" of the ...
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Average number of neurons a signal travels through?
What is the average number of neurons a signal goes through before reaching the end? Although it may be naive, it seems that the maximum amount of neurons a visual signal, for example, that passes ...
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56 views
Do humans see rates of change of colour
On a computer, we measure colour numerically, as three values, say red, green, blue. While our eyes include detectors for red, green and blue (although these aren't exactly the same as the light ...
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3 votes
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42 views
Is there a Mach band on a step edge or not?
Recently, I've been reading about the Mach band effect and there is a particular case which is confusing me a little bit, since people don't seem to agree on what actually should be perceived. It is ...
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