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EEG patterns 01

Topic: Physiology

Created on Saturday, April 28 2007 by jdmiles

Last modified on Saturday, April 28 2007.

This EEG shows someone who is:


 
        A) In stage I or stage II sleep
 
        B) Awake
 
        C) Being eaten by a bear
 
        D) Dreaming
 
        E) In stage III or stage IV sleep
 

 


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This question was created on April 28, 2007 by jdmiles.
This question was last modified on April 28, 2007.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS




A) in stage I or stage II sleep

This answer is correct.


This EEG shows light sleep, in this case stage I. There are Positive Occipital Sharp Transients (POSTs) and sleep spindles. There are no eye movements, and no significant posterior dominant rhythm or slow-wave activity. K-complexes or vertex sharp waves are also characteristic of light sleep, but are not seen in this image.  (See References)

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B) awake

This answer is incorrect.


This EEG shows light sleep, in this case stage I. There are Positive Occipital Sharp Transients (POSTs) and sleep spindles. There are no eye movements, and no significant posterior dominant rhythm to suggest wakefulness. There is little or no delta activity to suggest stage III or stage IV sleep. K-complexes or vertex sharp waves are also characteristic of light sleep, but are not seen in this image.  (See References)

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C) being eaten by a bear

This answer is incorrect.


For most people, being eaten by a bear is a stressful experience. This patient is relaxed, and in fact is in stage I sleep. Further, there is no movement or muscle artifact, which would almost certainly be present if he were being eaten by a bear.  (See References)

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D) dreaming

This answer is incorrect.


Dreaming occurs in REM sleep. This EEG shows light sleep, in this case stage I. There are Positive Occipital Sharp Transients (POSTs) and sleep spindles. There are no eye movements, and no significant posterior dominant rhythm to suggest wakefulness. Eye movements would also be seen in REM sleep. There is little or no delta activity to suggest stage III or stage IV sleep. K-complexes or vertex sharp waves are also characteristic of light sleep, but are not seen in this image.  (See References)

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E) in stage III or stage IV sleep

This answer is incorrect.


This EEG shows light sleep, in this case stage I. There are Positive Occipital Sharp Transients (POSTs) and sleep spindles. There are no eye movements, and no significant posterior dominant rhythm to suggest wakefulness. There is little or no delta activity to suggest stage III or stage IV sleep. K-complexes or vertex sharp waves are also characteristic of light sleep, but are not seen in this image.  (See References)

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References:

1. Levin, K.H., and Luders, H.O. (Eds.) (2000). Comprehensive Clinical Neurophysiology. W.B. Saunders Company, Philadelphia.
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physiology
EEG patterns 01
Question ID: 042807127
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 04/28/2007
Modified: 04/28/2007
Estimated Permutations: 4200

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