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The VideoToolbox software for visual psychophysics: transforming numbers into movies

Denis G. Pelli

Abstract

The VideoToolbox is a free collection of two hundred C subroutines for Macintosh computers that calibrates and controls the computer-display interface to create accurately specified visual stimuli. High-level platform-independent languages like MATLAB are best for creating the numbers that describe the desired images. Low-level, computer-specific VideoToolbox routines control the hardware that transforms those numbers into a movie. Transcending the particular computer and language, we discuss the nature of the computer-display interface, and how to calibrate and control it.

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Key concepts: Computer science, Interface (matter), Subroutine, MATLAB, Software, Psychophysics, Computer graphics (images), Human–computer interaction