title: Audiovisual presentation of video-recorded stimuli at a high frame rate.
abstract: 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.
authors.affiliation: Department of Behavioural Sciences, Linköping University, 581 83, Linköping, Sweden, bjorn.lidestam@liu.se.
authors.forename: Björn
authors.initials: B
authors.lastname: Lidestam
mesh_terms: D001296:Audiovisual Aids; D003626:Data Display; D009038:Motion; D009040:Motion Pictures; D009068:Movement; D011601:Psychophysics / Q000295:instrumentation / Q000379:methods*; D012984:Software; D012985:Software Design; D013997:Time Factors; D014741:Video Recording / Q000295:instrumentation