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7 votes
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How to use a QUEST staircase in 2-AFC?

There is a lot going on in your question. QUEST, as well as many other adaptive procedures, is well suited for a task like estimating morph distance in a 2-AFC paradigm. There are, however, a couple ...
StrongBad's user avatar
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6 votes

In the digit span test, why do some strategies work and others don't?

Chunking leverages long-term memory for the chunks, i.e. we recognize and remember much easier the familiar chunks, sometimes algorithmically. This is much easier explained in the domain of letters/...
against very long user names's user avatar
6 votes
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What are the advantages of 2AFC in a psychophysical discrimination task?

What makes a task a two alternative forced choice task? I am beginning my answer with this question because there is a general misconception about what 2AFC really means. Many people believe that ...
kindredChords's user avatar
6 votes
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Freeware for measuring keystroke duration

Psychopy (http://psychopy.org) can do this. It can do it in two ways. Using iohub. Iohub is a crazy powerful way to get any information about any kind of input to your system, from keyboard, mouse, ...
Jonas Lindeløv's user avatar
5 votes
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How to measure and quantify concentration or focus?

Short answer Attention can be quantified with a sustained attention to response task. Background I think with focus or concentration you mean sustained attention to a certain task. A sustained ...
AliceD's user avatar
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5 votes

Applying signal detection theory to single-stimulus presentations

There are a huge number of paradigms that SDT can be applied to. The simplest is probably the so-called yes/no paradigm. You present a single stimulus (typically noise alone or signal plus noise) and ...
StrongBad's user avatar
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4 votes

Why so few subjects in psychophysics?

It is partly as you already guessed, because the phenomena that are studied don't vary as much between individuals. This doesn't necessarily mean that individual differences in perception are smaller, ...
Ana's user avatar
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4 votes
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Does training affect the tactile oblique effect?

Indeed, research on this particular question is somewhat lacking, but what is available suggests that training does improve performance in tactile tests of the oblique effect. In an article published ...
Arnon Weinberg's user avatar
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4 votes

How to use a QUEST staircase in 2-AFC?

There are numerous studies that reveal contradictory data about face-to-face in autism. Continues the research paradigm that contrasts faces and objects. https://www.ncbi.nlm.nih.gov/pmc/articles/...
hexadecimal's user avatar
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4 votes

How to use a QUEST staircase in 2-AFC?

Start here: Adaptive Psychophysical Procedures (Treutwein, 1995) [PDF] If you want to get fancy, I suggest a more contemporary approach for the staircase called accelerated stochastic approximation. ...
noumenal's user avatar
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4 votes

How to test whether THC or CBD gives a mental boost?

The only study I'm aware of is the following: Cannabis increased verbal fluency in low creatives to the same level as that of high creatives. Cannabis increased state psychosis-like symptoms in ...
CuriousIndeed's user avatar
3 votes
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What are the benefits of giving feedback to subjects during a discrimination task?

Short answer Giving subjects feedback may affect their performance over time because of learning effects. The choice of giving feedback may be far less trivial than subjects getting bored yes or no. ...
AliceD's user avatar
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3 votes

How are people working in psychophysics trained?

Through necessity. I recently started working in Dr. Sohee Park's lab at Vanderbilt University processing the psychophysiology data generated during the Virtual reality social skills training game for ...
Ben Perlin's user avatar
3 votes
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How are people working in psychophysics trained?

Short answer Psychophysics is a multidisciplinary field featuring people with a Physics, Psychology, Medicine and/or Biology background. Background OK, here follows a lot of personal account to ...
AliceD's user avatar
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3 votes

Calculate threshold from 'binary' yes/no data

The biggest drawback of your procedure, also point of discussion previously here is the limited number of trials. Apparently, you obtained binary data, namely one answer (yes/no) per trial, basically ...
AliceD's user avatar
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3 votes

How to specify the quickest movement a human can do based on MTM standards?

I don't know about any MTM standards or benchmarks, but motor response latencies have been assessed in many studies. Importantly, auditory response latencies are smallest, then tactile followed by ...
AliceD's user avatar
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3 votes
Accepted

Where can I obtain a button box for reaction-time measurements under a Windows OS?

Short answer You can try a Cedrus response pad. They are reasonably priced and my personal experiences with these boxes are good. Background Response latency (RT) measurements using standard USB ...
AliceD's user avatar
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3 votes

How to fit averaged data to obtain a single psychometric function?

Short answer Averaging psychometric curves may not be the preferred way to pool psychophysical data. background Typically, extracted gold-standard outcome measures from the psychometric curves will be ...
AliceD's user avatar
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3 votes
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Why do errors such as typos happen?

Short answer Multiple factors are in play that affect error making. Cognitive load is an important element that increases the chance of making errors. Other factors are the presence of distraction, ...
AliceD's user avatar
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3 votes
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for a persistent perceptual experience, why is video able to have a lower frame rate than audio?

Sound is pressure waves; young humans can hear (aka, detect pressure waves) up to about 20 kHz. To produce these high frequency waves with a speaker with a time-domain signal, it is necessary to have ...
Bryan Krause's user avatar
  • 7,425
3 votes

What statistical tests should be performed to test effect of trials on response times where each subject has different number of data points?

This type of data (repeated measures on a group of subjects) lends itself perfectly for a linear mixed model (LMM) analysis. I'm into psychophysics myself and I have mostly abandoned simple ANOVAs and ...
AliceD's user avatar
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3 votes
Accepted

Which function to use for fitting learning curves?

Sigmoids are more general and probably better for modeling learning than a simple exponential. Your exponential fits decently, but it probably doesn't describe the actual underlying process very well. ...
Bryan Krause's user avatar
  • 7,425
3 votes

Are dedicated response boxes really better in precision than regular keyboards?

Short answer It all depends on what you wish to measure; if you are after measurements where a few milliseconds matter, response boxes are the way to go. Background RT measurements are finicky; USB ...
AliceD's user avatar
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3 votes
Accepted

What are these extra 11 dimensions of human mind?

No, there's no relationship to string theory. You might imagine brain activity as taking place in an N-dimensional space, where N is the number of neurons in the brain. However, neurons aren't ...
Bryan Krause's user avatar
  • 7,425
3 votes

How to evaluate the convergence of a staircase?

A staircase is an adaptive procedure. To test whether its outcome is correct you can do the math (e.g., Levitt (1971); Zwislocki & Relkin (2001)) by calculating what a 2-up, 1-down method ...
AliceD's user avatar
  • 20.7k
3 votes

Which unit should be used to compare perceived spatial frequency of 2 different sized image? Cycle per image or cycle per degree?

It's common practice to express size and related matters, such as visual acuity measures, in terms of angles (minutes of arc) (Stronks & Dagnelie, 2014). E.g., grating visual acuity tests don't ...
AliceD's user avatar
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2 votes

Timing accuracies for displaying frames and recording response times?

Short answer "Precision" and "accuracy" are relative parameters and the interpretation depends on your demands; their exact values depend on your hardware and software. Background RT measurements are ...
AliceD's user avatar
  • 20.7k
2 votes

Does work exist on relative valuations versus numeric valuations?

Short answer Sensory systems in general operate on a relative basis. Hence, seemingly objective rating scales are often still relative, because subjects implicitly, or explicitly compare previous ...
AliceD's user avatar
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