6 votes

Are there any free online questionnaire/survey sites that also measure the time it takes for participants to answer each question?

Here are a couple of suggestions: Inquisit records the timing of each response and can be run online. If you care about timing a lot and you need to run the study online, then this is quite a good ...
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5 votes

Is there an R implementation of the linear ballistic accumulator model or Ratcliff's diffusion model for measuring response time and accuracy?

The R package diffIRT (http://www.dylanmolenaar.nl/jss1265.pdf) estimates both the Q and the D diffusion models (see his website for the van der Maas et al. paper discussing the differences between ...
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4 votes

What experiment in a simple decision task should we run to obtain one million trials?

I agree with Marc-André, the selected stimuli should have no semantic association (or as little as possible) which is why I would encourage the use of geometric shapes that vary in colour. ...
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4 votes

What experiment in a simple decision task should we run to obtain one million trials?

I like this idea! I think the task should be one where the data could be used by many analytic tools. Hence, the data would not only be beneficial for one particular question, for example parameter ...
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4 votes

Should raw response time data be transformed?

You can transform RT, i.e., by log(1/RT). This makes the distribution roughly normal. The problem is that you don't usually run the ANOVA on the RT values collected at each trial, but on the average ...
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4 votes
Accepted

How many trials are needed to estimate a response time distribution?

The number of samples that are necessary for a good parameter estimation does indeed depend on the estimation method. I am not aware of a simple rule of thumb to determine an optimal sample size, but ...
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  • 2,605
4 votes

How many trials are needed to estimate a response time distribution?

Disclaimer: I'm not generally doing experiments where reaction time is the primary DV. But I thought I'd look at this issue and explored RTs from a neuroimaging dataset, and I think the findings are ...
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  • 2,414
4 votes

How to analyze reaction times and accuracy together?

As mentioned in the other comments, ANOVA is problematic when mixing types of predictor variables. (Generalized) mixed effects models are gaining popularity these days and actually provide a very ...
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  • 216
4 votes

What experiment in a simple decision task should we run to obtain one million trials?

Just a few comments... Since one of the advantages of a large data set is high statistical power, it might be a good idea to use a task where the key effect has not been found in previous studies. ...
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4 votes
Accepted

What experiment in a simple decision task should we run to obtain one million trials?

I don't like the idea that the task should be low error, errors are needed for modeling choice. I don't like random dot motion because there are big individual difference making it hard to find a ...
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4 votes
Accepted

How can reaction times be measured, and what affects it?

Reaction times can be measured by a variety of techniques in the lab. The simplest test is to present a stimulus to a test subject and instruct the subject to press a button as fast as possible after ...
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4 votes

How many participants are needed for online reaction time studies?

There are four variables of interest in a statistical power analysis: power (often chosen as 0.8 or 0.9 by convention, this is the probability of correctly rejecting the null hypothesis if it is false)...
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  • 5,816
3 votes

Is there an R implementation of the linear ballistic accumulator model or Ratcliff's diffusion model for measuring response time and accuracy?

In the subheading you also mention that you're interested in matlab / python implementations: I've personally used DMAT in matlab at that's a nice package. However, the python based HDDM package may ...
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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 ...
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  • 19.6k
3 votes
Accepted

How fast can the brain react in order for someone to pull a trigger?

Short answer The motor response latency to a visual stimulus is approximately 210 ms. Background You are basically asking for the visually induced reaction time of a motor response. Reaction times ...
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  • 19.6k
3 votes

How do people respond to auditory warning signals?

Often, very similar phenomena have different names when studied in different modalities, because they are studied by different communities. That's why searching for perception response times + ...
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  • 3,795
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 ...
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  • 19.6k
2 votes
Accepted

Should raw response time data be transformed?

This article by Whelan (2010) is one of the best introductory papers I've found on the subject. Normalization is covered quite clearly and extensively, including the caveats and "gotchas". ...
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2 votes

Should raw response time data be transformed?

My impression is that, recently, a consensus began to form recently that RTs should be transformed to satisfy model assumptions. This is especially true when data is analyzed with mixed models instead ...
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  • 790
2 votes

Is there an R implementation of the linear ballistic accumulator model or Ratcliff's diffusion model for measuring response time and accuracy?

The R package rtdists is another great option: Provides response time distributions (density/PDF, distribution function/CDF, quantile function, and random ...
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  • 763
2 votes

What experiment in a simple decision task should we run to obtain one million trials?

I vote for a simple random dot motion task. This has the advantages that: 1. It's easy to program. It can be delivered over the web via javascript, which makes the "many labs" aspect easy. 2. It's ...
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2 votes

What experiment in a simple decision task should we run to obtain one million trials?

Given many individuals (mostly men) have anomalies of colour perception, you might avoid colour; you also want a simple task with 'easy' stimuli, to enable short trial durations. Visual search ...
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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 ...
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  • 19.6k
2 votes

Does a general impairment test exist, that specifically would be useful for the context of driving?

In light of this - has any general impairment test - that perhaps tests reaction times or some other metric, that can be administered at a roadside, been developed? Yes. I believe it is called the ...
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  • 1,227
2 votes
Accepted

How to fit an ex-wald distribution model with R?

This seems promising. I haven't used it Heathcote, A. (2004). Fitting Wald and ex-Wald distributions to response time data: An example using functions for the S-PLUS package. Behavior Research ...
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2 votes

Dissecting human reaction time

Complex reaction times have been extensively studied and broken down into underlying processing stages. Sternberg (1969) [Acta Psychologica, 30, 276-315.] was one of the first systematic attempts at ...
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  • 2,617
1 vote
Accepted

Does a general impairment test exist, that specifically would be useful for the context of driving?

Based in Madison, Wisconsin, CTC & Associates provides technical communications services for the transportation sector, and together with the Minnesota Department of Transportation (MnDOT), they ...
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  • 11.1k

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