CMINDS

Computerized Multiphasic Interactive Neurocognitive DualDisplay System


Integrated Peripherals Support All Forms of Subject Response

(No Keyboard or Mouse Entry by Subjects)


Integrated peripherals offer comprehensive electronic data capture for a range of complex behavioral responses, such as verbal report, bilateral reaction time, direct voice capture, and digital graphic entry (pen). These capabilities significantly extend the range of assessments that can be effectively administered to impaired subjects on a computer platform.


CMINDS Peripherals



Precise Reaction Time Measurements

Microsoft Windows® and Vista® are indeterminate operating systems. The time between the point of programmatic stimulus presentation command and actual presentation cannot be measured accurately or precisely. The optimal solution is to control stimulus presentation and measure reaction time in the electronic domain, “outside of the OS”. To achieve this requirement, CMINDS® features a custom hardware solution for Zero-Phase Error reaction time measurement.


Visual Stimuli

Zero-phase error reaction time for video stimulus events is implemented by direct monitoring of the analog video input from the host PC. A video switch connected to a dedicated microprocessor, records the start of screen draw using a hardware clock at well under 1 microsecond accuracy and precision. The subject's button presses close a reed-type switch with a maximum "bounce" under 0.3 msec. Switch closure is detected by the microprocessor with microsecond accuracy and precision.


CMINDS Zero Phase Error RT for Video


Audio Stimuli

Zero-phase error reaction time for audio stimulus events is implemented by direct monitoring of the analog audio output from the final stage audio amplifier. Sound onset is directly detected by the dedicated microprocessor's hardware clock at well under 1 microsecond accuracy and precision. The subject's button presses close a reed-type switch with a maximum "bounce" under 0.3 msec. Switch closure is detected by the microprocessor with microsecond accuracy and precision.


CMINDS Zero Phase Error RT for Audio