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=Using Psychtoolbox=

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This MATLAB toolbox, downloadable [http://psychtoolbox.org/wikka.php?wakka=PsychtoolboxDownload here], is very useful for presenting text and images to subjects in behavioral and fMRI experiments and recording their response. For more information, see [http://psychtoolbox.org/wikka.php?wakka=HomePage here]
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==Introduction==

I provide scripts which are easy to use if you have and know MATLAB. They require a dependency toolbox, a lot of which is not needed but some is absolutely required, provided [http://cfn.upenn.edu/aguirre/code/matlablib/ here].

If you want to learn how to use Psychtoolbox, I suggest that you start from a working script and start editing to suit your own purposes. Make sure to use GetSecs to debug to make sure everything is timed just as you want it.

==fMRI experiments==

I provide two types of fMRI experiments using Psychtoolbox here: 
[http://www.ccn.ucla.edu/wiki/images/9/91/Run_Images.m Images Run File] 
[http://www.ccn.ucla.edu/wiki/images/e/e7/PresImages.m Images Presentation File] 
[http://www.ccn.ucla.edu/wiki/images/a/a4/Run_Text.m Text Run File] 
[http://www.ccn.ucla.edu/wiki/images/0/03/PresText.m Text Presentation File] 

These scripts are designed to present stimuli for a set amount of time and have a set InterStimulus Interval (ISI). Introduction and binary choice randomization are included.
Note that there is an option to use these scripts for multiple runs (or blocks) of the same type of experiment.

Predictably, the files with Images in their name are made to present images to subjects in the scanner. The files with text, on the other hand, present text to subjects.

==Behavioral experiments==

Here are two types of sample Text and Image presentation scripts with Psychtoolbox. 
[http://airto.hosted.ats.ucla.edu/wiki/images/e/e3/BehavImages.m Behavioral Image] 
[http://airto.hosted.ats.ucla.edu/wiki/images/1/1f/BehavText.m Behavioral Text]

The different between these is that the behavioral ones are self-timed. Once a subject responds, they will be moved on to the next stimulus with a prescribed ISI. Specific timing is also not debugged.
Breaks are also build into these experiments, where subjects get a break every n stimuli.

If you need to modify these protocols but are not sure how, please feel free to contact me (Wesley) and I'll try to help you.

Psychtoolbox - Revision history

Ccn admin: 1 revision

Elau: Undo revision 2758 by Aenalb (talk)