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.

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25 views

When one wiggles a dark object with bright letters &c on it, the letters appear to move, floating in the plane. What is this optical illusion called?

I stumbled upon this phenomenon in the 90s, when I was still a kid. I noticed that in the evening under indirect artificial lighting the red letters on a blue book cover (I think it was a Pink Panther ...
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Why do I perceive this picture differently when actively moving it than passively moving my eyes over it? [duplicate]

Look at this picture (it's best to click on it so you have the picture isolated; enlarge it so you'll be able to move it to and fro horizontally): When I move my eyes to and fro horizontally the ...
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38 views

Is the perceived flexibility in this picture (when moving it) related to the perceived curvature when it's not moving?

Look at this picture: All squares are of equal size but when you look at the picture the horizontal and vertical bands they constitute seem to be curved. When you move the picture up and down the ...
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61 views

What is the difference between recurrent and feedback synapses?

In the paper proposing recurrent convolutional neural networks (RCNN), "Recurrent Convolutional Neural Network for Object Recognition", it is stated that "recurrent synapses typically ...
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29 views

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 ...
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10 views

Differences between Visual Paired Associate Subtests 1 and 2 of the “Wechsler Memory Scale-Revised”

I am reading a paper in which the Visual Paired Associate Subtests 1 and 2 of the "Wechsler Memory Scale-Revised" are used to assess cognitive function. There is a significant difference in ...
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26 views

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 ...
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90 views

Why can’t my eyes gaze around at a constant rate?

I’ve wondered about this for quite a long time, but never thought to ask it anywhere: I’m assuming most people know what it’s like to watch a bird flying by, you can steadily concentrate as the bird ...
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30 views

A new kind of optical illusion?

By accident, I stumbled over this optical illusion: It is not a strong one, and maybe you don't experience it, but I see the size of the circles in the second last row decrease from left to right. I ...
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65 views

What degree of control do we have on eye movements?

When something "new" and "interesting" enters our visual field it can usually happen that our eyes move toward the new target. How "intentional" and "controllable&...
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42 views

How to view or download an open access article from ARVO journals?

I would like to read or download this ARVO Journal's article, but I just cannot find any button on the website with this functionality: https://jov.arvojournals.org/article.aspx?articleid=2139676 I ...
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28 views

Requirements and development of depth and spatial orientation sensing

I'm trying to understand from the signal processing perspective how the perception of depth and the ability of spatial orientation is calculated by our brains. One possible explanation seems to be ...
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89 views

Why is the occipital lobe behind instead of in front?

These are regions of our brain: Our eyes are in front below our forehead, however, the visual area Occipital Lobe is behind. Are there any biological reasons for this? why shouldn't Occipital Lobe be ...
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63 views

Do people who experience heautoscopy become unable to see their reflected image in a mirror?

I understand that people who experience autoscopy can see their body image outside them without a mirror. I had read many years back in a paper that people who experience the inverse phenomenon called ...
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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 ...
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97 views

Equalize/balance brightness and saturation of different colors using RGB (across various monitors)

We want to present different colors to participants in an online experiment (in an HTML/CSS-based application, hence we'll use RGB values). More in specific, we ...
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Objectively defining the image parameters for facial detection, recognition, and identification in digital imagery

Axis communications have given guidelines on minimum operational requirements of a camera to allow a human observer to identify, recognise, and detect human subjects (https://www.axis.com/en-ca/...
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43 views

Can eye tracking be used as a form of biofeedback?

I'm an occasional meditator and I've noticed that conceptual thought often produces eye movements, and I'm curious if anyone has tried using eye movements as a form of biofeedback. The Muse headset ...
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1answer
46 views

Why does an image seem smaller or larger through a pinhole when viewing with human eye

I was chewing gum when I took the Trident gum wrapper and rolled it into an open cylinder with a diameter of about 1.5mm (give or take 0.15mm). When I look through the gum wrapper (I have to put it ...
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17 views

Why does an image seem smaller through a pinhole when viewing with human eye

I was chewing gum when I took the Trident gum wrapper and rolled it into an open cylinder with a diameter of about 1.5mm (give or take 0.15mm). When I look through the gum wrapper (I have to put it ...
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34 views

How does number sense develop in blind people?

From what I understand about number sense and numerical cognition, the visual system is heavily involved in the approximate number system and the object tracking system, which are at the root of ...
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33 views

Retinotopic mapping to higher visual cortex

I know visual stimuli from retina presented in Cartesian coordinate is mapped to V1 as a form of polar coordinates. Wikipedia, Scholarpedia But I wonder whether this spatial representation in polar ...
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42 views

Accuracy of visual distance and size perception

Generally speaking it is known that human observers’ perceptions of distances in depth are generally inaccurate. I guess that the accuracy is sometimes a very large degree. To be more specific I am ...
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44 views

Multistable perception with three possibilities

I know that multistable perception refers to the phenomenon that occurs when we look at an ambiguous image like a Necker Cube or some sort of positive/negative space art, and we can’t perceive both ...
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51 views

Decussation of Cranial Nerves

Which cranial nerves decussate apart from the few nerve fibers of the optic nerve that do and how to easilly remember the cranial nerves that do? Here is a paper for the Trochlear Nerve But I have ...
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72 views

Visual Cortex percentage

Could somebody help please in providing some research papers or a resource book that states how much the visual cortex occupies of our cortex? I am trying to find some reliable source but I couldn't ...
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54 views

Why is deltaE not used as a measure of error?

I've recently read a few articles pertaining to visual memory. Most of them (e.g. https://doi.org/10.1167/9.10.7) use the continuous color recall task where they ask participants to recall the color ...
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32 views

Is there a double dissociation between face and object processing?

We know of the condition called prosopagnosia in which the processing of faces is impaired. Is there a condition in which the processing of faces is intact and the processing of objects is impaired, ...
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Relaxing your concepts in meditation

I am using the app Waking up from Sam Harris. A lot of his guided meditations tell you to perceive the world as the raw data of experience, instead of perceiving objects and concepts. To illustrate ...
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83 views

Is the visual cortex of a newborn baby immediately capable of object detection or is this skill learned over time, and if so, how?

Is the visual cortex of newborn babies right off the bat capable of making sense of raw visual data, for instance, converting the constant stream of raw RGB images perceived by the eyes into a ...
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Is there some cognitive test besides (visual) working memory in which some animals are superior to humans?

Assuming the research of Matsuzawa et al. (2007) (see also BBC video (2013)) isn't misleading, are there any other cognitive areas where chimpanzees (or other primates) have been observed to surpass ...
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1answer
214 views

Is there a foveal explanation for the duck-rabbit illusion?

Myself when I look at the duck-rabbit image, I see a duck if focus on the left (i.e. the beak) or a rabbit if I focus on the right (the nose). Is this how it works for most people, i.e. is the foveal ...
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88 views

Is the Thatcher Face Illusion only limited to face recognition?

The so called Thatcher-Illusion has been documented not only on humans but also in some monkeys. However I can't find literature clearing out if this effect only applies to face-recognition. What ...
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37 views

How are ocular dominance columns monocular despite binocular complex cells?

Orientation columns in the primary visual cortex are known to have (mostly) simple cells in layers 4 and 6, and (mostly) complex cells in layers 2,3 and 5. Orientation columns spanning an entire range ...
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Differences in reaction time on visual tasks with and without binocular disparity ques?

Have there been any studies done that test the reaction time to vision processing tasks with and without the benefit of binocular disparities? I have been wondering how much depth information (such as ...
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1answer
42 views

Is there any evidence for or against the existence of neurons that encode surface slant in vision?

In the way orientation columns display selectivity for various edge orientations projected on the retina which is then repeated at various angles in a localised region of the cortex. I am wondering ...
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1k views

Are scintillating scotomas really caused by cortical spreading depression? If so, how is this known to be true?

I have just read about a visual effect called a scintillating scotoma. Many variations occur, but scintillating scotoma usually begins as a spot of flickering light near or in the center of the ...
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1answer
254 views

Unilateral vision in split brain subjects

I am just beginning to learn psychology and came across concept of split brain. I was wondering if a person has only left eye working and has their corpus callosum cut, would they be effectively blind ...
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1answer
38 views

Fit a psychometric function when the maximum is not 100% (not because of lapse)

I found that currently the form of psychometric function assumes that the proportion correct lies between 0.5-1 given the range of stimulus level, but how to fit a psychometric function when the ...
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2answers
615 views

If the optic nerve transmits to both hemispheres, how do split-brain experiments work?

From what I understand, the optic nerve of each eye transmits information to both hemispheres of the brain. This is unlike other sensory and motor information, where (for example) the right hand is ...
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93 views

Is the perception of drawings an acquired skill?

Most descriptions of visual perception explain how our brains interpret incoming visual stimuli (via feature detection, monocular depth cues, etc.). They then assume that the same process works for ...
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1answer
367 views

Visual field testing: Choose between Yes/No, 2AFC, and 2IFC task?

As a newbie to psychophysics experiment, I have a small project to do visual field testing on healthy, adult, naive subjects. The experiment stimulus is a small sine grating (0.3 degree, 6 cycles/...
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137 views

Finding largest level of imperceptible noise in an image

Suppose that we want to find the "largest level" of a random noise that can safely be added to an image such that the resultant noisy image cannot be distinguishable from the original noise-free image....
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123 views

Why do we see shadows in the following black-and-white optical illusion?

How does neuroscience explain the following optical illusion? Look at tiles. You will see spots of shadow near all corners. The shadow will be missing from some corners very near the center of your ...
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228 views

Why do views make you happy?

Why does having a nice view from your window make you happy? (As in people ask for a hotel room with a nice view). Could this be replicated by simply having a large TV screen showing a view? What ...
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1answer
36 views

How do I interpret an effect of electrode position in ERP research?

The example I have in my research is that both conditions show greater amplitude and latency in the parietal electrode sites than in the occipital ones. I'm not sure how meaningful this is for my ...
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141 views

Human vision detection of faint blinking or moving point of light, guidelines for sensitivity versus frequency

This question is in the neurology/neuroscience rather than the psychology aspect of this site. I'd like to check the limits of visibility of a (presumably green) LED at large (kilometer) distance, ...
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48 views

Convolutional Operations in the Visual Cortex

One of the fundamental operations in image neural networks is the operation of convolution, where a filter slides across the receptive field, activating on particular features. This is incredibly ...
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1answer
82 views

When your two eyes disagree sharply

Now and then, the image from each eye is so different from the other that it seems the brain has trouble combining them into a coherent image. You can create this situation by putting a hand or sheet ...
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Ability to identify an “average” vs a maximum (or minimum)?

I have a hypothesis that humans are better able to identify the largest (or smallest) in a set of objects, compared to their ability to identify an average object, i.e. the one closest to the mean. ...

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