1 / 12

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).

Download Presentation

polysomnograph

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related