Questions tagged [psychophysics]
For questions about the quantitative study of varying a stimulus's properties to observe the effect on sensation (and perception)
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Research and theories related to the physical form of Cognitive Fallacies
Is there any research about what physically happens inside our brain anatomically and neurologically when we humans commit cognitive fallacies (especially those fallacies documented in the book of ...
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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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Which unit should be used to compare perceived spatial frequency of 2 different sized image? Cycle per image or cycle per degree?
I am interested in the topic of spatial frequency and its impact on face processing. I have been reading about previous studies that have used different spatial filtering thresholds for their stimuli. ...
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How to evaluate the convergence of a staircase?
I have a 2AFC staircase, with transformed up and down method (2up 1 down) or (2down 1 up), with equal step size (at the beginning there are higher step sizes, at the end there are the lower value).
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What are these extra 11 dimensions of human mind?
I posted this question on the physics stack exchange, but I was guided to ask the question here though from the view point of a neuro-scientist which should be more useful if she has already followed ...
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Why is threshold at 76% correct when d-prime = 1?
In signal detection theory using a 2-alternative forced choice task, when d' = 1, threshold is found at the stimulus intensity which is perceived 76% of the time (https://www.oxfordreference.com/view/...
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Are dedicated response boxes really better in precision than regular keyboards?
There are various (very pricey) commercial response boxes or pads (perhaps most notably Cedrus) that purportedly offer higher precision than regular keyboards. (Note that my question focuses on ...
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Modeling psychophysical data: appropriate visualization to account for experimental design
Background information:
I am modeling psychophysical data at the trial level for the first time. The data stem from a visual line bisection task with constant stimulus intensity, the response variable ...
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Different psychophysiological systems will turn on when dealing with things voluntary instead of involuntary
I heard somewhere that different psychophysiological systems will turn on when dealing with things voluntary instead of involuntary.
If you compose a stressor on two groups of people.
On one group ...
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What is the recommended way to deal with failed trials during an experiment run?
Imagine I run a psychophysical experiment. I have generated a sequence of trial conditions which are presented to each participant in same order. But not all of participants are equally good at ...
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Slope of psychometric function too steep?
I am in a project where we are preparing a visual decision making experiment which requires participants to detect vertical grating in a patch of dynamic noise (the noise pattern is updated on every ...
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Which function to use for fitting learning curves?
Background
I am fitting learning curves for cochlear implant (CI) users. These folks get a CI, and then need to start learning to understand speech again. They keep on improving for years. Along the ...
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What statistical tests should be performed to test effect of trials on response times where each subject has different number of data points?
I am running a behavioral experiment where a number of subjects (=20 in my case) perform a simple cognitive task. The experiment consists of a fixed number of trials (say, 40 in my case). During each ...
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Are there any definitions of the perception & JND of the colour of light approximately like how the Weber Law defines it for the brightness of light?
As I understand it, the greater light levels are the more we require in order to detect a difference. I've also read this holds true for colour saturation. However, I can't seem to find any ...
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May somebody use oddball paradigm solely for psychophysical studies?
I'm an undergraduate linguistics student with a strong interest in cognitive psychology of visual attention. Nowadays, I'm studying on an undergraduate research project in which I'm planning to use ...
