Audiovisual presentation of video-recorded stimuli at a high frame rate

A method for creating and presenting video-recorded synchronized audiovisual stimuli at a high frame rate—which would be highly useful for psychophysical studies on, for example, just-noticeable differences and gating—is presented. Methods for accomplishing this include recording audio and video separately using an exact synchronization signal, editing the recordings and finding exact synchronization points, and presenting the synchronized audiovisual stimuli with a desired frame rate on a cathode ray tube display using MATLAB and Psychophysics Toolbox 3. The methods from an empirical gating study (Moradi, Lidestam, & Rönnberg, Frontiers in Psychology 4:359, 2013) are presented as an example of the implementation of playback at 120 fps.