Psychtoolbox-3 (or PTB-3) makes it easy to synthesize and present accurately controlled visual and auditory stimuli and interact with the observer and common research hardware. It has at least 25,000 active users, an active forum, and is highly cited. It works with Matlab versions 7.x and GNU/Octave 3.2.x on GNU/Linux, Apple Mac OSX, and Microsoft Windows.

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