GSR Auditory Threshold Mechanisms: Instrumentation, Spontaneous Response and Threshold Definition

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Abstract
EDR recording apparatus with amplitude measured as change in electrical conductance of skin using constant base current of 40 ua, and latency determination by presenting EDR''s on cathode ray oscilloscope, each sweep being triggered simultaneously with stimulus tone onset, was used on 20 subjects by analyzing normalized amplitude vs. latency at each of 5 test-tone in-tensities: +10, +5, +0, -5, and -10 db. All responses at -10 db were interpreted as spontaneous and all responses were rejected at -10 db. When this criterion is applied to +10 db intensity only 7% of responses were rejected. Result indicated advisability of using high percentage response for threshold criterion in presence of spontaneous activity.

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