A non-human script generated these pages, so some things may look a little odd.

The Psychophysics Toolbox is a collection of Matlab functions

that extend the language to give you exquisite control of your

computer to test observers with research-grade dynamic stimuli.

Every Psychtoolbox function has its own documentation available through

the Matlab HELP command, and, in the case of MEX files, through the

function itself. We've tried hard to make these individual bits of

documentation clear, accurate, and complete. We're grateful to receive

corrections.

We've mostly followed Mathworks's help-text conventions, but note that in

our help text we designate optional arguments to function calls by

embracing them with square brackets. You're not meant to include these

brackets when you actually call the function. For example, "help Snd"

will tell you this:

meaning that the "command" argument is required and the "sig" and "rate"

arguments are optional. A typical call to Snd looks like this:

The most important and generally useful functions, especially Screen, are

in PsychBasic. The PsychDemos will show you how to do useful things in

Matlab with the Psychtoolbox. Try these:

The folder PsychDocumentation contains bits of documentation about

technical implementation details, how to solve specific tasks and

how to troubleshoot common problems.

To read more, also look at the main website http://psychtoolbox.org.

The web site also has advice about getting help, the Psychtoolbox forum,

and the latest information about bugs and new releases:

PsychAlpha - Under development. Experimental, risky, undocumented.

PsychAlphaBlending - OpenGL alpha-channel blending utilities and constants.

PsychBasic - Basic support routines for psychophysics.

PsychBeta - Under development.

PsychCal - Calibrate your video monitors.

PsychCalDemoData - Demo calibration data.

PsychColorimetric - Colorimetric calculations.

PsychColorimetricData - Standard colorimetric data.

PsychContributed - Contributed programs.

PsychDemos - Show how to use the Psychtoolbox.

PsychDocumentation - Documentation about specific topics.

PsychFiles - Process text files.

PsychGamma - Fit monitor gamma functions.

PsychGLImageProcessing - Built-in image processing via graphics hardware.

PsychHardware - Interface to plug-in hardware.

PsychInitialize - Initialize and deinitialize MATLAB

PsychMatlabTests - Document the few bugs in Matlab 5.2.1.

PsychObsolete - Obsolete routines, still present for compatibility.

PsychOpenGL - Routines for low-level access to OpenGL 3D graphics.

Psychometric - Psychometric function fitting.

PsychOneliners - Trivial, but handy, functions.

PsychOptics - Optics calculations, mostly for human optics.

PsychPriority - Priority and Rush. (formerly within PsychBasic)

PsychProbability - Probability and statistics.

PsychRects - Manipulate rectangles for drawing.

PsychSignal - Signal processing and math routines.

PsychTests - Evaluate performance of software and hardware.

PsychVideoCapture - Functions for realtime video capture.

Quest - Threshold estimation procedure.

http://psychtoolbox.org/

If you want to acknowledge use of this software when you publish your

research, you might say something like this, "We wrote our experiments

in Matlab, using the Psychophysics Toolbox extensions (Brainard, 1997;

Pelli, 1997)."

- Brainard, D.H. (1997)
*The Psychophysics Toolbox*, Spatial Vision 10:443-446. - Pelli, D.G. (1997)
*The VideoToolbox software for visual psychophysics*:

Transforming numbers into movies, Spatial Vision 10:437-442.

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