MP Systems with an STP100C module can interface with most major visual presentation programs, including: SuperLab® (see STP100W), E-Prime®, DirectRT®, MediaLab®, Inquisit®, and Presentation®. The STP100C module connects to either the SuperLab digital I/O card or the parallel port of the presentation computer. As the presentation program presents the stimuli to the subject, it also sends digital event markers to the optically isolated STP100C module. MP Systems have 16 digital I/O lines that accept digital marker information from the presentation program.
The Mac version of AcqKnowledge will automatically event mark and categorize the digital markers using a binary interpretation scheme. The Digital Input to Stim Events analysis script converts TTL data acquired on thedigital channels of an MP device into stimulus events. Stimulus delivery events aredefined in the graph for each low to high transition of the digital data, the indicationsof stimulus delivery. The digital channels are interpreted as a binary number. Eachstimulus event placed into the graph has the corresponding number included with itslabel. This allows further analysis to distinguish between different types of stimulusevent by using the cycle detector's label matching capability.
