Instrumentation for Presenting a Known Standard Signal to the GSR Channel forAssessing Response Characteristic of Selected Polygraph Instruments

摘要

Anecdotal evidence suggested that signals recorded using computerized polygraphinstruments with the galvanic skin response (GSR) channel set in the manual mode are substantially different from those recorded with the instrument set in the automatic mode. Such a device was conceptualized, designed, constructed, tested, and aligned in the laboratory using readily available electronic components. The response characteristics of various computerized polygraph instruments were subsequently analyzed using the device. Results confirmed the verbal reports of differences between signal characteristics in the manual and automatic modes.