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Topic: Leonardo Response Box (Reaction Time) (Read 6 times) previous topic - next topic

liudr

What's wrong with dropping a meter stick trick? Psychologists can't do math? 8) Just google for a youtube video. It's super easy and costs you nothing.

robtillaart

Quote
Psychologists can't do math?

It is more complex. With the invention of the digital calculator many people (not only P.) got worse in math as they delegate their math abilities to a machine / program.

The next ability humankind will loose change is memory (instant fact knowledge). People delegate more and more of their knowledge to the internet. Instead of remembering a fact they remember the pointer to that fact. Broken links will cause amnesia :)
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

TimG62

I just registered, so I'm very late to this topic.  I'm doing much the same thing you are/were working on.  Arduino timing precision and accuracy data are presented in the article at http://reactiontimes.files.wordpress.com/2013/02/arduino-rt.pdf.  The authors used E-Prime software to create an experiment, present stimuli, and to cue an Arduino to monitor response buttons for a response, record RTs, and then send them back to the E-Prime program for data logging.  E-Prime is pricey, though I have an early version that works with Arduino.  I plan to see if the open source PsychoPy can do the same thing, but I haven't gotten into that yet.  Good luck to you.

robtillaart

looks like a very interesting PDF.

Long ago I participated in a psy-experiments and we found that VGA screens (60Hz) added on average almost 10 milliseconds to human reaction time. Also the standard deviation increased. Lesson learned was that you need to understand the working of the used equipment in detail to interpret / give meaning to the measured data.
Other example is a standard keyboard scanned at a certain frequency by the PC. For text editing this is fast enough, for reaction time measurements it isn't.
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

TimG62

I used to employ direct shutter-controlled presentations of stimuli (with a tachistoscope) in reaction time experiments instead of computer monitors because of the lag created by the monitor scan that you refer to.  E-Prime and PsychoPy software get around the lag problem by synchronizing stimulus presentations with the onset of a screen scan cycle.  However, that limits stimulus exposure durations to some multiple of the time for a screen scan (around 14 to 16 msec usually).  The big advantage of using the computer is the endless versatility and ease of stimulus creation (audio, video, etc.).  Also, the response boxes referred to in the original post eliminate most of the lag from using keyboards for responses.  The Arduino is simply a much more affordable way to make a response box.

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