Trigger sources
Catches almost any stimulus
Wide support for input signals and sensors means many trigger sources can be used: sound card outputs, microphones, piezoelectric or inductive sensors, response buttons, logic signals from external stimulators (TTL, CMOS and so on), visual markers on a computer screen, LED indicators, strobe lights or slide projectors.
- Sound & microphone
- Response buttons
- TTL / CMOS
- Screen markers
P300 application
A P300 experiment to identify a culprit
A PowerPoint presentation is prepared with 50 pictures in all, of people the suspect may know (targets) and people they do not (non-targets); about five times as many non-targets as targets is recommended. A visual sensor on the screen detects small black-and-white markers on the slides, and g.TRIGbox produces a TTL trigger pulse at every slide change. The real-time system compares the evoked potentials; the largest P300 response appears for pictures of the people the suspect knows.
- P300 paradigm
- PowerPoint
- Real-time EP analysis