The two additional tables in the Calibration box of the Monitor Center provide conversion from DKL and LMS colour spaces to RGB.Ģ.2 Units for the window and stimuli One of the key advantages of PsychoPy over many other experiment-building software packages is that stimuli can be described in a wide variety of real-world, device-independent units. Note that, if you don’t have a photometer to hand then there is a method for determining the necessary gamma value psychophysically included in PsychoPy (see gammaMotionNull and gammaMotionAnalysis in the demos menu).
#Psychopy scale description serial
To run a calibration, connect the PR650 via the serial port and, immediately after turning it on press the Find PR650 button in the Monitor Center. Alternatively this can be added manually into the grid to the right of the Monitor Center. If you have a Spectrascan PR650 (other devices will hopefully be added) you can perform an automated calibration in which PsychoPy will measure the necessary gamma value to be applied to your monitor. Requires n/a Screen width in pixels Screen width in pixels and screen width in cm Screen width (pixels), screen width (cm) and distance (cm)Ģ.1.2 Calibrating your monitor PsychoPy can also store and use information about the gamma correction required for your monitor. Your choice of units determines the information you need to provide: Units ‘norm’ (normalised to width/height) ‘pix’ (pixels) ‘cm’ (centimeters on the screen) ‘deg’ (degrees of visual angle)
In order for this to be possible you need to inform PsychoPy of some characteristics of your monitor.
Of course, the name of the monitor in the script needs to match perfectly the name given in the Monitor Center.Ģ.1.1 Real world units One of the particular features of PsychoPy is that you can specify the size and location of stimuli in units that are independent of your particular setup, such as degrees of visual angle (see Units for the window and stimuli). e.g.: from psychopy import visual win = visual.Window(, mon='SonyG500') For experiments created as scripts you can retrieve the information when creating the Window by simply naming the monitor that you created in Monitor Center. For experiments written in the Builder view, you can then import this information by simply specifying the name of the monitor that you wish to use in the Experiment settings dialog. Information is inserted in the Monitor Center (Tools menu), which allows you to store information about multiple monitors and keep track of multiple calibrations for the same monitor. These are issues that users should be aware of, whether they are using Builder or Coder views.Ģ.1 Monitor Center PsychoPy provides a simple and intuitive way for you to calibrate your monitor and provide other information about it and then import that information into your experiment. PsychoPy - Psychology software for Python, Release 1.84.2 doi:10.3389/neuro.11.010.2008Ĭiting these papers gives the reviewer/reader of your study information about how the system works, it also attributes some credit for its original creation, and it means provides a way to justify the continued development of the package. Peirce JW (2009) Generating stimuli for neuroscience using PsychoPy.
Peirce, JW (2007) PsychoPy - Psychophysics software in Python. PsychoPy - Psychology software for Python Release 1.84.2ġ4 PsychoPy Experiment file format (.psyexp)ġ.1 Citing PsychoPy If you use this software, please cite one of the papers that describe it.
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