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| Polygraphy |
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| Polygraph is a simple instrument that records qualitative changes in physiological parameters. These parameters include vital changes like cardiac variables (ECG), heart pulse rate (HR), relative blood pressure (BP), rate of breathing and so on. Popularly called the lie detector. A modern improved version of this device is used to record, neuro physiological parameters such as brain activity by EEG, EMG (Electro myograph) to record muscle tonus, and EOG (Electro oculograph) to record eye movements. |
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| The important applications of this device are: |
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| 1) Lie detecting. |
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| 2) Monitoring of stages of sleep like, when the patients fall asleep, how many wake periods they experience and the quality and duration of sleep. |
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| 3) Electrophysiological behaviour of the brain and its dysfunctions. |
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