![]() ![]() If it would be helpful to you or the group, I can condense my test program, add comments to make it more readable, and make it available. ![]() The few times I went through this process the clock in the dual core duo iMac I tested did not differ significantly from the button box over a several minute period. From this they calculate a correction factor. The way they do this in Psyscope is to reset both clocks, wait for a long time and then read both clocks. Since the bbox clock and the computer's clock might run at slightly different speeds, you must synchronize the bbox clock with the computer's clock to measure response latencies accurately for stimuli presented on the screen. It also has an internal clock and can report to you the internal times when events occur. It has a sophisticated voice key built in, and can be used to send TTL pulses to external devices. The participant was instructed to use the index finger of their preferred hand and to keep their finger poised above the middle (i.e., yellow) button at the start of each trial. The Voice Key Tuning button and the DTVKTuner program 22 Starting the DTVKtuner 22 Recording sound and trigger data to computer 23 Auto vs manual tuning procedure 24 The Manual Procedure 24 The Automatic Procedure 24 Tracking and inspecting the triggers 26 Ending the tuning procedure and going back to PsyScope. The coloured buttons on the PsyScope button box are ordered, left to right, red, yellow and green. It is sturdy, using pinball machine like buttons. It is a small separate box with a separate microprocessor, three push buttons, matching LEDs, an output to the Macintosh, outputs to other devices, additional. The duration of the button press was not recorded. Both a pillow placed within the head coil and a thermoplastic face mask were used to minimize head movement. Subjects responded by using a fiber-optic light-sensitive keypress interfaced with a PsyScope Button Box (Carnegie Mellon University, Pittsburgh, PA). The ioLab button box is very well designed. Subjects viewed the stimuli by way of a mirror mounted on the head coil. I have incorporated it (with one minor change) into a psyschopy program to test getting button responses and sending triggers to external devices, but I have not tried to test the timing accuracy/reliability. The folks who make the PsyscopeX button box ( ) provide a python library for accessing their button box. ![]()
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