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They provide an intersection between technology, social interaction, and the sharing of information
Responses from the somatic nervous system, essentially via electromyogram. ( via adding responses through your body in order to add abstract or involuntary actions)
Responses from the autonomous nervous system that include blood pressure, heart rate, temperature and stomach pH, among others.
Response from the central nervous system obtained via electroencephalogram, which detects brain rates (alpha, theta, SM and MU waves).