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Psychopy Logo.png
Development statusActive
Written inPython

PsychoPy is an alternative to Presentation, e-Prime and Inquisit. It is a Python library and application that allows presentation of stimuli and collection of data for a wide range of neuroscience, psychology and psychophysics experiments. When used on DCC computers PsychoPy is guaranteed to be millisecond accurate.


Since Python version 2.7 has reached end of life since January first 2020, this version is no longer installed on the PCs in the labs. Standard is now: Python 3.7 64-bits. If you still have scripts written in Python2, the scripts should be upgraded to Python 3. Most changes are probably the print statements. Print statements should always have parentheses: print('some text') Key differences between Python 2 and Python 3 are here:

Psychopy 2020.2.10 has been installed in the root of the Python3.7 64-bit version. This is also the default version when 'psychopy' is typed from the command prompt. It is also the default that opens when a .py file is double-clicked. It also can be started by clicking the appropriate icon on the desktop. There is also a Psychopy 2020.2.10 installed on Python3.6 32-bits. This version has its own icon on the desktop and should be used when you are using a TOBII Eyetracker.

When your script fails to load in Psychopy, because you need packages that are not installed on our labcomputers, please contact TSG.

On the labcomputer, there is support for Spyder, PyCharm and Psychopy.

Installation for Tobii users

Since Tobii does not support 64-bits and does not support Python higher than version 3.6.8, there is a 32 bits Python version 3.6.8 installed. If you want to use a Tobii Eyetracker and want to install Python and Psychopy yourself, download Python here: Python3.6.8 (Windows) or here: List of downloads for Python3.6.8. Please choose a 32-bit version. Run the installer, choose to add python to the file path (it's an option in the installer).

Download from here: PsychoPyDependenciesPython3.6.8.txt. Open a command prompt (with administrator rights), go to the folder where the downloaded file is and type: pip install -r PsychoPyDependenciesPython3.6.8.txt

This should install everything you need for a basic Psychopy installation. Since packages are updated once in a while, this PsychoPyDependenciesPython3.6.8.txt might get outdated at some time. Please let us know.

Note: in our labs, the 64-bits Python and 64-bits Psychopy are installed as default. The 32-bits Python 3.6.8 and 32-bits Psychopy are installed in a separate virtualenv. If you want to use Python3.6.8 from the command prompt, you first have to type: workon Python36 After that, everything should work from Python3.6.8, including the 32-bits packages.

Installation for other users

We recommend to use a modern 64-bit version of Python. In our labs, we currently have Python 3.7.6 64 bits installed. You can download it here: Python3.7.6 64 bits (Windows) or choose here: Please choose a 64 bit version.. Run the installer and make sure to add Python to the file path (it's an option in the installer).

The information below is obsolete

Learning PsychoPy


Find the presentation Template here


Version Change to 1.85

If you use audio in psychopy, but you do not choose the back-end yourself (this is the default method), then sound will be played in a different, more reliable way. This may lead to slightly larger but still small latency.We do not expect this to be problematic. If you have any questions about this, come to TSG. Do you use audio in psychopy and choose your own backend with the following line:

prefs.general['audioLib'] = ['pyo']

change this

prefs.general['audioLib'] = ['sounddevice']

This may lead to slightly larger but still small latency. We do not expect this to be problematic.

If you have any questions about this, come to TSG.

Also see:

Version History

For version history and bug fixes please check here:

Google Mailing list

For various information please click here:!forum/psychopy-users

GitHub Repository

For requests / bug report / issues click here: