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. Zoom ‘ n ‘ scroll for precise inspecting, up to sample rez. Features: 4x stereo inputs for multi channels checking, showing them either individually, as overlapped layers, summed, L, R, or mono sum.
#Psyscope button box free
It has a sophisticated voice key built in, and can be used to send TTL pulses to external devices. Psyscope is a free synced oscilloscope plugin inspired from Psylab build-in scope. Vocal response times were measured using a high-impedance microphone attached to an ioLabs button box. Subjects matched the color of a cue stimulus displayed for 450 ms in the center of the screen to the color of a Stroop target stimulus that appeared for 1100 ms after an inter-stimulus interval of 300. press interfaced with the PsyScope Button Box was used to record.
#Psyscope button box software
Auditory stimuli were presented on headphones. Stimuli were created and presented with PsyScope software and were synchronized with MRI acquisition using a PsyScope button box as interface. Visual stimuli were presented using PsyScope software 17 running on Apple PowerMac G4. Sequencing of stimuli and timing of responses were controlled using PsyScope X software (Cohen et al., 1993). Psyscope is a beat-synced oscilloscope that can analyze up to four audio channels simultaneously. It is sturdy, using pinball machine like buttons. Visual stimuli were presented on the monitor of an iMac desktop computer. Psylab has released Psyscope, a freeware multi-channel beat-synced oscilloscope in VST plugin format for digital audio workstations on Windows. The ioLab button box is very well designed. 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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