d like to make use of video clips in my experiment but need accurate response timing relative to various scenes in the clip. How can I use the toolkit to ensure I get millisecond accurate timing?
Traditionally all experiment generators are very poor at timing when video is playing. By using the BBTK response pad together with DSC (Digital Stimulus Capture) you can obtain sub-millisecond accurate presentation and response timings. Use a video editor to super impose a 16×16 pixel white reference block at the start of each scene you are interested in. Other scenes should have a black reference block so that they dont activate the opto-detector. Attach an opto-detector to the screen of the remote PC. Typically we do this by using a smaller opto -detector which can be attached unobtrusively to the bottom right of a screen. Attach the BBTK response pad to the BBTK expansion port. Attach the Active Switch Closure lead(s) from the pad to the primary response button of your own response device if needed. Run DSC (Digital Stimulus Capture) in response pad mode. When your capture is complete use the data analyser to check for the occurrence of the reference block on the scene you are inte
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