Psychology and Neuroscience Stack Exchange
Psychology and Neuroscience Stack Exchange

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.

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.

For more information see the Wikipedia visual system and visual perception articles.

David Hubel's Eye, Brain, and Vision online edition.

273 questions
6
votes
1 answer

How is the focal point determined when looking into a clear sky?

When looking into a clear blue sky, no cloud, birds, trees or any object to give a frame of reference. When a person is actively looking, as opposed to day dreaming or gazing. The sky goes for a long distance, and with uninterrupted view, and I…
user10932
5
votes
1 answer

Are we actually seeing black colored objects?

We know that black objects absorb light with almost all the frequencies of the visible spectrum. This means there will not be any frequency of light reflected and falling on our retina, in order for us to see that object. Does this mean that I am…
Vaishakh Rajan K
  • 245
  • 1
  • 5
4
votes
1 answer

Does transparency have its own visual channel?

Referring to (for example) Visual Thinking for Design, the book discusses various low-level processing channels in the brain. Colour and orientation are two examples. I wonder if transparency is another such channel; and if it isn't, how exactly…
Izhaki
  • 1,115
  • 6
  • 10
4
votes
1 answer

Asaccadia adaptation

Can asaccadia (i.e., lack of saccades, due to neuronal or muscular damage) be overcome? Do other muscles (e.g., neck) compensate? Are the resulting gaze patterns the same as for saccades, and are they involuntary the way saccades are? Conversely, in…
John Pick
  • 2,193
  • 1
  • 19
  • 23
4
votes
1 answer

SAD Therapy Light Specifications?

I keep running into alternative theories and facts about what specification of light to use in sun lamps for light therapy treatment. Many actual afflicted people seem to just swear by just pumping as much light as humanly possible onto a person's…
Jonathon
  • 141
  • 1
3
votes
0 answers

Macaque V1 excitatory and inhibitory neuron tuning properties?

I am looking for tuning properties of excitatory and inhibitory neurons in V1 of Macaque (like orientation and direction selectivity), similar to results reported by Niell and Stryker (2008). Most papers I found do not seem to classify these…
Luke Taylor
  • 131
  • 2
2
votes
0 answers

While scrolling the web page interesting effect encountered with an image....is this optic inertia?

While scrolling this web page, interesting effect encountered with the image below. Is this optic inertia? The faster the scrolling, the more wavelike figures appear on three areas in the picture.
Janko Bradvica
2
votes
0 answers

Parallel target search and serial blank search

Wolfe (1991) reports an example of a search that seems to be parallel for target trials and serial for blank trials: Here's another example from Wang et al., 1994 Strangely, In Treisman's seminal 1980 paper she also reports a serial slope for…
TanZor
  • 121
  • 2
2
votes
1 answer

Are the receptive fields of bipolar and retinal ganglion cells directly stimulated by light?

I know this is a basic question, but I can't find the answer anywhere. How can a cell that is not photoreceptive (eg LGN and retinal gangion cells) have a receptive field that is stimulated by "light" (as most textbooks explain it). Isn't it truer…
confused
  • 21
  • 1
2
votes
0 answers

What is it about Ken Reid's style of drawing lumps on surfaces [shown here] that makes our visual system so easily interpret it?

Ken Reid was an artist who drew for the Beano and other comics, and was known for strips such as Frankie Stein and Queen of the Seas. And for The Nervs, about the little men who run our brains, but that's not why I'm asking this. He had a rather…
Jocelyn Ireson-Paine
  • 91
  • 1
  • 4
1
vote
1 answer

3D Glasses Aftereffect

I am wearing a pair a 3D glasses. The left lens is red and the right lens is cyan. However, when I take them off, my left eye sees in cyan and my right eye sees in red, the complete opposite of the glasses. Why does this happen?
Eversome
  • 13
  • 2
1
vote
0 answers

How does the brain know the difference between large distant objects and small nearby objects?

If you had two objects with words on them, one very large font and one very small font. The large font object is further away from you than the small font object, but you could see the detail on them equally the same as they appear identical in size…
WDUK
  • 111
  • 2
0
votes
0 answers

Is the retinal image a picture?

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 external world. This seems very misleading to me. If it is meant as a way…
Tony C
  • 1
  • 1
0
votes
0 answers

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 through before evoking a response could be estimated…
Danny Han
  • 143
  • 4
0
votes
1 answer

Is there a word that differentiate between image rotation and image translation?

For an image with an object (e.g., a cat) and its slightly tranlsated image (or its flipped image), an average person can instantly recognize that the objects in the both images are the same (i.e., a cat). However, for an image with an object and…
le4m
  • 103
  • 3