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            This is a file from the  Wikimedia Commons. Information from its  description page there is shown below.  Commons is a freely licensed media file repository.  You can help. 
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        Summary 
        This is a screen shot of a patient during Slow Wave Sleep (stage N3). The high amplitude  EEG is highlighted in red. This screen shot represents a 30 second epoch (30 seconds of data).
         Licensing 
        
         
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          This work has been released into the  public domain by its author,  MrSandman at the  English Wikipedia project. This applies worldwide.
 In case this is not legally possible:  MrSandman grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. 
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       File usage
       
        The following pages on Schools Wikipedia link to this image (list may be incomplete):
        
        
       
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