Dreams, location of?

Prat Itharat pitharat at sas.upenn.edu
Tue Jan 24 03:00:00 EST 1995

In article <1995Jan23.085947.24080 at rtc.atk.com> viosca at rtc.atk.com (Randall Viosca) writes:
>Newsgroups: bionet.neuroscience,alt.dreams.lucid
>Path: netnews.upenn.edu!dsinc!newsfeed.pitt.edu!gatech!howland.reston.ans.net!news.moneng.mei.com!uwm.edu!src.honeywell.com!newshost.imageman.com!sinope!viosca
>From: viosca at rtc.atk.com (Randall Viosca)
>Subject: Dreams, location of?
>Message-ID: <1995Jan23.085947.24080 at rtc.atk.com>
>Organization: Alliant Techsystems, Inc., Mpls, MN
>Date: Mon, 23 Jan 1995 08:59:47 GMT
>Lines: 39
>Xref: netnews.upenn.edu bionet.neuroscience:5888 alt.dreams.lucid:6217

>This might not be the right group for this, but...

>I'm looking for papers or any information about where the brain
> creates/has visual and audio  stimulation/activity during dreaming.

REM (which is suggestive of dreaming) as well as activity in the middle 
ear muscles "appear to be driven by phasic bursts of electrical activity that 
can be recorded in animals from a variety of structures in the brain stem [the 
dorsolateral pons, motor nuclei of the oculomotor, trigeminal, and facial 
nerves], in the thalamus [laternal geniculate nuclei] and in the visual and 
auditory cortex."  REM is also correlated to PGO [pontine-geniculate-occiptal] 
spikes activity.  Activity of cholinoceptive neurons in the pontine tegmentum 
also seems to play a crucial role.
(this by no mean lists all areas involved - for those following up, please 
correct me where appropiate)

-quote from Kandell, Schwartz, Jessell - PRINCIPLES OF NEURAL SCIENCE, 3rd ed. 

>Specifically, what parts along the visual pathway (if any) are
>stimulated or active to the point that it might be inferred that those
>parts are actively visualizing or creating the image the dreamer is
>perceiving?  Is the striate cortex active?  It may seem far fetched,
>but has anyone been able to measure retinal activity during dreaming?

>Or have dreams been proven to be a more symbolic, higher level
>cortical function? 

Freud deals with dreams on a psychological basis [symbolism of dreams] in THE 
INTERPRETATION OF DREAMS.... but not necessarily as a higher level cortical 

>I am wondering if the circuit could look something vaguely like this
>*logical* diagram:

>                                    S
>                                    W
>                                    I (or filter?)
>  receptor (environmental) input    T
>eyes --------->[LGC]----------->\   C
>                                 \  H  
>                                  >--->StriateCortex>---+
>       Symbolic (Dreaming) input /                      |
>      +------------------------>/                       |
>      |                                                 |
>      |                                                 /
>      ^                                                /
>      Higher cortical area(s).  <---------------------/ 

>And could there be an analogous representation for audio?

>I know there is much research underway with PET, MRI and SQID; have
>any of these been applied towards dream research?

>Thank you,

hope some of this helps...

pitharat at sas.upenn.edu

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