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Arousal level judging apparatus and method

  • US 4,928,090 A
  • Filed: 12/08/1988
  • Issued: 05/22/1990
  • Est. Priority Date: 12/09/1987
  • Status: Expired due to Term
First Claim
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1. An arousal level judging apparatus comprising:

  • (a) skin potential level detection means for detecting a skin potential level of a human body;

    (b) level change detection means for detecting a degree of change in a level of an output signal of said skin potential level detection means over a predetermined interval;

    (c) a comparing means for comparing said degree from said level change detection means with a first predetermined value to detect a pulse-like change in said skin potential level;

    (d) convergence detection means responsive to an output signal from said comparing means for detecting a non-pulse like portion in said skin potential level by analyzing successive changes of gradient determined by said degree from said level change detection means;

    (e) storing means for storing said skin potential level as a reference value when said non-pulse like portion is detected by said convergence detection means; and

    (f) arousal level detecting means responsive to said skin potential level from said skin potential level detection means and to said reference value from said storing means for determining arousal state and non-arousal state of said human body using the relationship between said skin potential level and said reference value.

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