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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1answer
793 views

How does the brain read rotated text?

Suppose a human ran across a letter written at a 45 degree angle. How does the brain read this text? Most people don't often see text written at an angle, so it seems safe to assume that the brain ...
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1answer
23 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 ...
3
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1answer
36 views

What is the metabolic load of the visual system?

The brain consumes energy at eight times the rate that would be predicted from mass alone (20% of total organismic load). How much of this is drawn from the visual system? How does the metabolic load ...
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0answers
51 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
23 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 ...
3
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1answer
47 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 ...
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2answers
59 views

What is the difference between spike-triggered averaging and reverse correlation?

I'm interested in the difference between spike-triggered averaging and reverse correlation. In some papers (i.e., Schwartz, Odelia, et al) I see the term 'Spike Triggered Averaging'. In others, (ie ...
8
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2answers
141 views

Does perception have a “frame rate”?

Are the objects of visual perception processes divisible into individual, still frames, like video is? If so: Are the perceptions from different senses synced to the same frequency? Are these ...
5
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2answers
52 views

Sensitivity of human eye to luminance

I heard once that the human eye has a logarithmic scale for luminance, e.g. to "feel" that a surface is three times as luminous compared to another, the former emits a light 8 times more powerful than ...
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0answers
20 views

What is the most biologically plausible model of the retina?

Perhaps, retina is one of the most well studied and well understood parts of the brain. Are there any full models of the retina that would mimic the firing of the ganglion cells based on the input ...
3
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1answer
28 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 ...
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1answer
72 views

Computational model of biological object recognition

The human brain can achieve a remarkable ability to recognize visual patterns in an Invariant, selective and fast manner. The human visual system is quite powerful. It has an exquisite selectivity ...
2
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1answer
41 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, ...
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1answer
66 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 ...
4
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1answer
72 views

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 ...
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0answers
41 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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3answers
324 views

Are colors real?

We know that we distinguish colors when they fall on our photo receptors in our eyes and neurons pass its signals to our brain to recognise them as the specific colors. How accurate is it? For ...
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2answers
92 views

Are there physical techniques to relieve eye strain? [closed]

I asked a question about eye strain Does looking into a mirror relieve eye strain in a similar way to looking at distant objects?. Are there any physical exercises or techniques that can help to ...
3
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1answer
44 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 ...
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0answers
30 views

What are biologically plausible ways to model binocular disparity?

I figure there is a vast body of literature on stereovision, both neurophysiological and computational studies. Computer Vision also provides some algorithmic insight on implementing binocular ...
3
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1answer
492 views

Why do humans' eyes enter an unfocused gaze when recalling a memory or imagining something?

The question is self-explanatory (I hope). Is this trait unique to humans? Does the direction of the unfocused gaze indicate anything about which physical part of the brain is being utilized? Is ...
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0answers
29 views

What creates the experience of “erasure” in visual perception?

When I was reading about object substitution masking, the author mentioned that sometimes we experience "erasure" of masked object. I sometimes have this kind of experience myself. It looks like the ...
4
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1answer
102 views

Sensory dissonance: Will the visual or auditory channel win?

Is there any research showing that our visual channel takes precedence over the auditory channel (or vice versa) if there is some dissonance between them? Examples: Say a person driving a car ...
3
votes
1answer
77 views

Why is my Gabor patch not resizing as a function of the bounding box?

I'm trying to create a Gabor patch of variable size for an upcoming experiment. Below is the python function used to generate the code. The code was ported from this tutorial for Matlab (assume ...
2
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1answer
245 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 ...
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0answers
56 views

How to set up a binocular rivalry experiment, that splits a single image in two separately controlled ones?

The question is about the actual physical setup and steps needed to take in order to experiment with the phenomena. I found a tutorial on jove.com, "How to Create and Use Binocular Rivalry", and it ...
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2answers
170 views

Are closed eye movements related to the content of dreams or the imagination?

During rem sleep there are observed eye movements, which seem like they would correlate with the person visualizing their dreams. Do their eye movements actually try to follow what they're dreaming ...
4
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1answer
144 views

Does looking into a mirror relieve eye strain in a similar way to looking at distant objects?

Sometimes when having an eye exam the eye chart is viewed through a mirror to increase the distance between the person and the chart. When using consoles, it is recommended to look away from the ...
3
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2answers
141 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
136 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 ...
6
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1answer
259 views

Does the structure of consciousness mimic that of the visual process?

It seems to me that the structure of the conscious mind has some strong similarities to the way our visual field functions. The visual field has a strong and detailed focus at the center, and this is ...
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2answers
136 views

Is the concept of neuroplasticity applicable to visual cortex and how does it affect visual perception?

I've been searching about this but all I found was this presentation, which is a bit too technical for me to understand, e.g: Visual Cortical Plasticity In what way does neuroplasticity affect the ...
5
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2answers
124 views

Any models that act using both streams of visual processing?

The Two-Stream Hypothesis, where object properties are processed independently from spatial information, remains the most well established theory of visual processing. However, it concerns me that ...
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0answers
27 views

Source for turning cone cell opponent process diagram into equations

There is a diagram on wikipedia that is part of the article on the opponent process. I assume practical equations have been developed, at least reasonable approximations, but they appear to be missing ...
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2answers
62 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 ...
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0answers
124 views

How can schemas be applied to website design? [closed]

If a "schema is a cognitive framework or concept that helps organize and interpret information. Schemas can be useful because they allow us to take shortcuts in interpreting the vast amount of ...
7
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1answer
138 views

Do eyes accommodate to color?

I've heard that our eyes accommodate between colors too far from each other in the visible spectrum. I imagine it's not a true focal point accommodation, but rather linked with how brain processes the ...
7
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0answers
74 views

Are there any models of the human visual field of view taking into account head, neck and eye movements and calculating likelihood of fixation?

I would like to know if there are studies that (1) model the field of view taking into account all degrees of freedom of the head, neck and eyes and (2) if there is any probabilistic model assigned to ...
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0answers
35 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 ...
5
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0answers
85 views

Inducing Auditory-to-Visual Synesthesia

I recently watched an interesting video that was discussing conveying color to the blind through language. It implied that there may be a way to insert the sensation of color into a person's mind via ...
6
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1answer
69 views

Any research on how we use visual category information in visuomotor tasks?

So I've been reading up on the Two-streams Hypothesis*, and it bothers me that the explanations both sides give only extend to tasks involving one type of visual information. For example, an ...
4
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2answers
632 views

What does hemispatial neglect vision look like?

I need to know more about hemispatial neglect, in order to compose a picture of what it would look like to someone who has this issue. Is there any resources for finding more about their actual ...
3
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1answer
91 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 ...
5
votes
2answers
181 views

Minimum duration for presenting a visual stimulus on screen

My experiment involves presenting simple visual stimuli briefly on screen (200 ms to 1000 ms). The stimuli would be simple enough (e.g. a circle and a line) but I want to use a range of durations to ...
10
votes
3answers
131 views

Images on personal computers - Which aspect of size to keep constant?

For various reasons we're doing a reaction time study involving images that runs on unstandardized equipment: patients' personal computers (unless they don't meet certain requirements). It's not about ...
10
votes
3answers
160 views

What neural mechanism explains the tendency to visually attend to the whole scene before attending to details?

I have the intuition that human vision first attends to large-scale objects and then small-scale details. Is there any mechanism in the visual cortex that will explain this phenomenon? Is there a ...
8
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1answer
151 views

To what extent do individuals vary in their ability to mentally visualise?

Background: Yesterday I was shocked when a friend of mine told me that he can see only "completely black darkness" when he closes he eyes. When I close my eyes, I can see some images or "movies" of ...
4
votes
1answer
65 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 ...
8
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1answer
277 views

How do people visually recognize their own reflection?

I'm interested in how the brain processes and recognizes the image of the person's own face. A bit of background: A while ago I've developed an overlay-camera like app for iPhone that allows me to ...
5
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1answer
116 views

How is light processed by the human brain when awake and in dreams?

I've recently seen this great video: How your brain tells you where you are. The video discusses how certain cells within the brain fire based on proximity to objects. There are great examples of ...