PsyScope X B77 is a program to design and run psychological experiments; it is used by many experimental labs.
It has been developed at Carnegie Mellon by Jonathan Cohen, Matthew Flatt, Brian MacWhinney and Jefferson Provost for Mac OS 9 in the '90s. Thanks to its creators, its code is now public, under the GNU GPL license. It has been ported to OS X by the SISSA Language, Cognition and Development Lab, thanks to a collective effort sponsored by several labs.
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