Stimulus Presentation
Stimulus Presentation
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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