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.

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112 views

Eye movement tendencies for shades, sizes, shapes, and colours

I was asked this question yesterday Which of the following statements regarding research principles in visual attention is TRUE? The eyes tend to move from: a. Light to dark (shade) b. Large to ...
4
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1answer
66 views

What's the name of the quantifying preference for visual stimulus by varying size or distance as compared to a reference task?

Say that you enjoy looking at two beautiful paintings (A and B). But you really can't tell which one you like more, and you want to (quantitatively). So, you compare them both to your favorite ...
4
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0answers
43 views

Why do I see those static pictures as they are moving [duplicate]

Have a look at the following static pictures: There are more of them here. On the same website this PDF describes findings.However I could not find any explanation why this phenomenon happening. ...
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0answers
74 views

The accuracy & malleability of memory for color

How accurate is colour memory for the standard person? It would seem most people are quite good at remembering the colour of objects by visualising the object. But in some cases peoples visualisation ...
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0answers
83 views

What functions does the brain perform to recognize a familiar object unconsciously?

Let's say a person's brain experiences how a vehicle/object looks for the very 1st time. It would require lot of attention/focus/processing to analyse the object, extract features and train its neural ...
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0answers
78 views

What would happen if you saw no form of light for a year?

It's proven that low levels of dopamine result in depression, anxiety, etc. And low levels of dopamine just means a lack of production or intake by the dopaminergic receptors. If the lack of happiness ...
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0answers
33 views

Grating orientation & frequency which induces highest gamma

I am doing some research on perception and gamma activity in V1 area. To check some of my results I need to find an experimental result, from which I would know which orientations and frequencies of ...
4
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0answers
66 views

Evidence for a 2-component framework of visual attention distribution

As part of my bachelor thesis on eyetracking-based gaze guidance, I've done quite a bit of reading (again) on visual attention and visual attention distribution. What caught my attention (haha) ...
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0answers
46 views

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 ...
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48 views

Does the subjective experience of artificial light brightness vary for people, if so, by how much?

I'm thinking about human perception and particularly the experience of how bright artificial light is. I'm talking about dusk, when the sun has set and only street lamps and light reflecting off ...
3
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2answers
98 views

Does the retina encode visual information like a Bitmap or an SVG?

I heard recently that a scientist has developed a retina prosthesis. So I think this is a question that has an answer. Does the retina encode information like a Bitmap image or an SVG image? (A ...
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2answers
767 views

What is the maximum size of content the human eye can focus upon?

What is the maximum size of content the human eye can focus upon on a computer screen? Is there a general equation that gives this size as a measure of distance from the screen etc.? What is the ...
3
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1answer
93 views

Is consciousness a sub product of the brain or is there a duality? [duplicate]

I am trying to understand what consciousness is, based on my basic knowledge of our senses, artificial intelligence (computer vision, specifically) and some philosophy. Here's my reasoning: As far as ...
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1answer
1k views

Why do “cool” colors, which are actually warmer, look cool, and vice versa?

Why do cool colors look cool that are in fact warmer, and why do warm colors look warm when they are actually cooler? Blue wavelength has higher energy than red, i.e, blue flame is hotter than red ...
3
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1answer
57 views

What is forward masking

I am trying to understand what is visual masking (or more specificaly forward masking). I have read the explanation here, but still.. I understand that a background can interfere with a frontal ...
3
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2answers
49 views

Color and shape arriving together in visual system

I know that in the visual cortex there are separate visual pathways for both color and shape. Do these separate pathways imply that human beings become consciously aware of these features separately ...
3
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1answer
61 views

How do hallucinations appear through reversing goggles?

If one is experiencing elaborated visual hallucinations, what will happen when one puts on reversing goggles? Will hallucinations change their orientations as well? Links to relevant papers will be ...
3
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1answer
375 views

What is the proper term for the synchronization of eye movements?

In humans and most two eyed species, eye movements synchronize so that both eyes are focused on the same point. This facilitates 3D vision significantly, allowing bifocal cues. I remember reading a ...
3
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1answer
220 views

Does the human visual system implement (adaptive) histogram equalization?

The human visual system is very good at 'cancelling out' shadows and other lightning effects, and focusing on the contrast in images. A famous example of this is Adelson's checker shadow illusion: ...
3
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1answer
53 views

Where can I find stimuli for steady-state visually-evoked potentials?

I am a student working on a project which deals with Steady State Visually-Evoked Potentials (SSVEP) Stimuator. Does anybody know where can I find stimuli (checkerboard or single graphic) as a video ...
3
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1answer
48 views

How can I create a set of comparable symbols of different shapes?

I was thinking about doing a small experiment during university course where participants have to answer a personality quiz and then they have to compare different symbols (like triangles, rectangles ...
3
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1answer
28 views

What is the location of the center-surround receptive fields of retinal ganglion cells?

I have read wikipedia article about receptive fields of visual system and it states the following: The receptive field is often identified as the region of the retina where the action of light ...
3
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2answers
61 views

How much our visual limitations are instrument(eye)-based, and how much are they brain-based?

Are the limitations to our vision like the field of view and singular focus entirely based on the limitations of the eye? It seems like it's possible to feed an artificial signal into the brain ...
3
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1answer
32 views

What is the relationship between neurotransmitter release and resting potential in retinal bipolar cells?

Retinal bipolar cells are known to have resting potentials from which they can become more or less polarized. What I'm wondering is whether a bipolar cell's neurotransmitter-release rate is zero when ...
3
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1answer
128 views

What are the visual cognitive abilities of a new born?

We know that a newborn (3 days or less) can mimic facial expressions such as tongue protrusion and head movement. This means that the child can detect faces, segment various parts of face like tongue, ...
3
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1answer
59 views

A subtle test for color-blindness

Is there a test method of proving a person being color-blind, without letting the test subject know, that he/she is being tested? E.g. showing the person cards with colored dots like depicted here is ...
3
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1answer
70 views

Does the brain stop processing data when the eyes move?

I was reading this question and remember back to the 70s when our local newspaper changed formats. In an article about why they made the changes that they did, one of the points they mentioned was ...
3
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1answer
35 views

Are representations of unattended objects “bound”?

In our phenomenal experience, different features of an object, like shape and color, seem to be "bound" together into a single percept, even though those features are represented in different parts of ...
3
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1answer
174 views

Are there any cognitive models for image interpretation?

Are there any cognitive models which can be used for image interpretation. I have tried to find some specific models which can be used for image interpretation but have not been able to find any model....
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0answers
15 views

How image orientation influences perception

Im a painter for many years. When I paint, I usually walk around and look at my painting for many hours. When painting session is long, it harder and harder to maintain a "fresh look". By fresh look; ...
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0answers
11 views

Searching for literature on cognition of flyover animations

I'm rewriting a journal article on flyover animations: the virtual camera moves in a 3D map environment (e.g. a flyover of the Grand Canyon showing off the topography). The paper describes our user ...
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0answers
109 views

Optical illusions : human universal vs environmental influences [closed]

It's well known today that the susceptibility to optical illusions are influenced by the environment: multiple studies with the Müller-Lyer illusion conducted in Zambia proved this environmental ...
3
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0answers
62 views

What is the source for the W3C's Contrast Ratio formula?

The Word Wide Web Consortium (W3C) has a formula for the contrast ratio of any two arbitrary colors, which they use to set minimum standards for text legibility: http://www.w3.org/TR/WCAG20-TECHS/G18....
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150 views

Progress on Arnheim's perceptual forces in vision

In the second edition of Rudolf Arnheim's Art and Visual Perception: A Psychology of the Creative Eye, published in 1974, the opening chapter on "balance" begins with a discussion of "perceptual ...
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1answer
55 views

How does the brain structure 3D visual data?

Adobe Illustrator has taken over five minutes (and counting) to render a vector 2D image rotated 18° in 3D on my computer. And yet, I and nearly anyone else can easily visualize the subject rotated ...
2
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1answer
27 views

What is the relation of visual quality and distance from the central field of view?

I have read somewhere that Our visual perception degrades non-linearly with distance from the fovea. However, it was not referenced. I was wondering if there is a reference talking about this?...
2
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1answer
120 views

Effective sampling rate in human visual system

The [stroboscopic effect][1] is often explained as one of the problems of sampling. If sample rate is too low, you might have the impression of the signal frequency being low or even reverse. There ...
2
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1answer
35 views

Toolbox for modelling visual search performance

I'm looking for a toolbox to model visual search performance in a singleton search task based on line orientations (you need to find a line that is most different from all others in it's orientation). ...
2
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1answer
33 views

What are the estimates in total neurons and average connections per neuron for each of the processing areas of the visual cortex?

I am trying to find ballpark estimates for the number of neurons in each functional area of the visual cortex (V1, V2, V3, etc). While nice if known, the numbers themselves are not as important to me ...
2
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1answer
78 views

Is all vision based on movement?

This is something I recall from a class on human perception: vision is based on "movement" or change in what hits receptors, so if your eyes were perfectly still you couldn't see, but always-present ...
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0answers
15 views

Is there any evidence for a bias towards perceiving darker surfaces as 'figure' rather than 'ground'?

Given that surfaces which capture attention are more likely to be perceived as figures (or figures attract attention more than ground does?), is there a bias associated with the luminance of a surface....
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0answers
24 views

Could one use priming (from realistic images to drawings thereof) to help teach the conventions of line drawing?

Line drawing is a very stylised form of art. There are no lines in nature, and artists have to learn the conventions to be used when drawing in line. I am interested in whether one could help them ...
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2answers
77 views

If the color black reflects no light, how are we able to see it?

If color as we perceive it is dependent on the wave lengths that are reflected by an object, with white reflecting all hues and black absorbing all, how do we detect a black object? I do understand ...
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1answer
43 views

What is the maximum time difference to still associate an acoustic and visual event?

I am developing a game where the music needs to be synchronized to the actual game logic. That means that some objects in the game react to events in the music. Of course, the music will never be ...
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1answer
28 views

Is there visual focus during a saccade?

Has anyone succeeded in measuring where the focus is between saccades? Through some kind of nonintrusive brainscan perhaps? I would like to be able to draw with my thought :) (Something similar would ...
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1answer
28 views

Does the retina contribute in distinguishing lines and borders?

I think there is a phenomenon behind the way which our eyes judge between lines of contrast, like black lines on a white page, by just recognizing the contrast areas at the level of the rods and cones....
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1answer
63 views

Pupillometry: how long needs the pupil to respond towards an cognitive stimuli?

I would like to know if somebody could give me some references on the latency of the pupil response after a cognitive stimulus. I know that the light reflex is quite fast compared to cognitive ...
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1answer
60 views

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 ...
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0answers
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Why does checkerboard pattern on a computer screen appear with a yellowish tint? [closed]

This question was moved from Physics here per advice from the comments. Originally, I was choosing between Physics, Biology and Computer Graphics, and I guess the correct site depends on the correct ...
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Conscious versus Visual Representation Update

In their paper "A cortical network that marks the moment when conscious representations are updated" Stottinger et al claim that there is a network in the anterior insula, medial and inferior frontal ...