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Visual PsychophysicsFrom Laboratory to Theory$
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Zhong-Lin Lu and Barbara Dosher

Print publication date: 2013

Print ISBN-13: 9780262019453

Published to MIT Press Scholarship Online: May 2014

DOI: 10.7551/mitpress/9780262019453.001.0001

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Stimulus Presentation

Stimulus Presentation

(p.61) 4 Stimulus Presentation
Visual Psychophysics

Zhong-Lin Lu

Barbara Dosher

The MIT Press

Typical experiments in visual psychophysics present a sequence of one or more images called a “movie” to the observer and collect responses. In this chapter, we introduce the basic terminology and issues in stimulus presentation. We dissect a simple experimental program written in Psychtoolbox, including display presentation and timing, response collection, and simple data analyses. We provide experimental implementations of several representative stimuli and tasks, including measuring human judgment of the direction of a moving sinewave grating, magnitude estimation of brightness, a contrast psychometric function and contrast sensitivity function, rapid serial visual presentation, presentation of movies from video files, and a retinotopy display for fMRI.

Keywords:   Programming visual tests, Psychtoolbox, Movies, Stimulus presentation, Display timing, Gamma correction, Visual angle, Display setup module, Experimental module, System reinstatement module

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