Polygraph and Galvanic Skin Response (GSR)

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8 Terms

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Autonomic Nervous system

output to smooth muscle, cardiac muscle, and gland tissue

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sympathetic nervous system

“fight or flight”-stress repsonse

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parasympathetic nervous system

“rest and digest”-relaxed state

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Polygraph/ Lie detector has 3 physiological parameters…

Cardiograph-heart rate (BPM)

Pneumograph-breathing rate (bpm)

Galvanic skin response-sweat (micromho)

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Ohm’s Law

Sweat (salt water) increases the conductance of the skin

Resistance is measured in Ohm

Conductance is measured in Mho (micromho)

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Green line

GSR (micromho)

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Red line

Respiration (breaths per minute/bpm)

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Blue line

Heart rate (beats per minute/BPM)