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polysomnograph

polysomnograph. monitor many responses while sleeping. Polysomnograph. brainwaves. heart monitoring. electromyogram (muscle movement). eye movement EOG = electro-oculograph. airflow. EEG. electroencephalograph. EEG -- electroencephalograph. 1. 2. 0. 4. 3. voltage. time (seconds).

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polysomnograph

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  1. polysomnograph monitor many responses while sleeping

  2. Polysomnograph brainwaves heart monitoring electromyogram (muscle movement) eye movement EOG = electro-oculograph airflow

  3. EEG electroencephalograph

  4. EEG -- electroencephalograph 1 2 0 4 3 voltage time (seconds)

  5. EEG -- electroencephalograph wavelength 1 2 0 4 3 amplitude voltage time (seconds)

  6. Beta waves 13-40Hz • normal “awake” mode • associated with alertness, arousal, problem solving, concentration • waves are fast but low amplitude • indicate many neurons firing, at all different times • note time scale in seconds

  7. Alpha 7.5-13Hz • awake • associated with relaxation • tasks that are engrossing – but don’t require much “thought” • note difference in shape from beta • greater proportion of neurons firing at the same time • greater synchrony

  8. Theta 4-7Hz • associated with sleep • neuron activity influences nearby neurons • neurons “synchronize” – one fires, which causes nearby neurons to fire • at peaks, many neurons are firing synchronously • this makes the peaks higher, and farther apart, than alpha or beta waves

  9. Delta 0-4Hz • associated with deep sleep • synchronous, slow firings • greater synchrony than theta waves • high-amplitude, low-frequency wave • generated by the lack of processing by neurons • also found in comatose patients

  10. epilepsy • petit mal • grand mal

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