The PC can also run Psychophysics Toolbox but currently this software cannot utilize the response pads in the MSR. 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). PsyScope X is set up on the Mac Mini but is rarely used. Subjects viewed the stimuli by way of a mirror mounted on the head coil. We use this for both auditory and visual experiments. Stimuli are normally administered via Psychophysics Toolbox, which operates with MATLAB or, if from the PC, via Presentation or DMDX software.
Psyscope button box series#
The interface between the buttons and the computers is a 904 FIU series photodiode box. The actual peripheral response buttons in the MSR are two 2-button response pads (a total of four buttons) utilizing a photodiode system that sends signals directly to the stimulus computer via a USB plug. Responses by the subject are triggered either by voice (See the OptoAcoustics system ) or button-press from a Current Designs (Philadelphia, PA) fiber optic system. Each participant experienced a 30-trial block each of both operant and observational trials. 1993), and used the Psyscope Button Box for timing and input. Imaging was performed on a 1.5 T GE Signa whole-body MRI system. Subjects responded by pressing a switch with the right index finger and responses were collected by a computer interfaced to the switch using the PsyScope button box. Both of these devices have millisecond resolution accuracy, and are not susceptible to the same drag that Mac and PC system “clocks” are. Materials, Design & Procedure All experimental runs were conducted on Apple iMacs running Psyscope (Cohen et al. The projected image appeared on a mirror mounted above the subjects head. For PsyScope, all timing for experiments, along with all responses made during experiments, is managed by a Response Button Box developed by ioLab Systems. For the iMac and PC, stimuli triggering is run through a StimTracker Model ST-100 (Cedrus Corporation San Pedro, CA). We also have an Apple Mac Mini running PsyScope X software. Natick, MA), or from a PC running Presentation (Neurobehavioral Systems, Inc. MilliKey button events generate standard keyboard events with millisecond precision. At present, all of our experimental stimuli are administered from an Apple iMac computer utilizing Psychophysics Toolbox, which operates with MATLAB software (The MathWorks, Inc. MilliKey 1000 Hz USB response box / pad with integrated event timing.
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