The PC can also run Psychophysics Toolbox but currently this software cannot utilize the response pads in the MSR. PsyScope X is set up on the Mac Mini but is rarely used. 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. 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. Both of these devices have millisecond resolution accuracy, and are not susceptible to the same drag that Mac and PC system “clocks” are. For PsyScope, all timing for experiments, along with all responses made during experiments, is managed by a Response Button Box developed by ioLab Systems. We use this for both auditory and visual. Stimuli are normally administered via the PsyScope program, version 1.2.5 (occasionally, bugs in this freeware force us to use version 1.2.2). For the iMac and PC, stimuli triggering is run through a StimTracker Model ST-100 (Cedrus Corporation San Pedro, CA). The adapter is of the homemade variety formerly it was known as a Marantz box, but after some recent repairs it has come to be known as the Adachi box. ![]() We also have an Apple Mac Mini running PsyScope X software. MilliKey button events generate standard keyboard events with millisecond precision. ![]() Natick, MA), or from a PC running Presentation (Neurobehavioral Systems, Inc. MilliKey 1000 Hz USB response box / pad with integrated event timing. A fibre-optic, light-sensitive key press interfaced with the PsyScope Button Box (New Micros, Dallas, Texas) was used to record participants’ behavioral. Participants viewed the screen through a mirror. 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. Stimuli were projected to participants with an Epson (model ELP-7000) LCD projector onto a screen positioned at the head end of the bore.
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