PsychoPy is an open-source application allowing you run a wide range of neuroscience, psychology and psychophysics experiments.

PsychoPy aims to be:

  • Easy enough for teaching
  • Precise enough for psychophysics
  • Flexible enough for everything else!

To achieve these goals PsychoPy provides a unique choice of interface: use the Builder interface to build rich, flexible experiments easily or use the Coder interface to write extremely powerful experiments in the widely-used Python programming language. The best of both worlds!


New PsychoPy paper: Please cite this if you use PsychoPy Builder in your studies

Peirce, J. W., Gray, J. R., Simpson, S., MacAskill, M. R., Höchenberger, R., Sogo, H., Kastman, E., Lindeløv, J. (2019). PsychoPy2: experiments in behavior made easy. Behavior Research Methods. 10.3758/s13428-018-01193-y

Latest version: 3.1.2 April 2019

Release series 3.1.x adds a Keyboard class which is much faster (polling the USB bus directly and at a higher rate) and supplies key durations automatically where possible (for keys that have been released). As always, see the Changelog for full details.

Buy the official book!

You can now buy the book, Building Experiments in PsychoPy from Sage Publishing!

300 pages of great advice on how to create better experiments with a combination of Builder and some code snippets! Suitable for a wide range of audiences, with separate sections for:

  • beginners (suitable for undergraduate teaching)
  • professionals (more technical detail for the afficionado)
  • and specialists (with particular use cases like EEG, fMRI, psychophysics).

See the full Changelog

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