Left/Righ and hearing

SJM Guzman jose.guzman at medizin.uni-leipzig.de
Tue May 10 05:51:21 EST 2005


Dirk Bruere at Neopax wrote:
> Left and right visual data are procecessed by opposite hemispheres.
> Is the same true of hearing, or is it left-left and right-right?
> 

For hearing the process is basically the same. Sensory information 
(hearing, seeing, smelling...) is processed by specific neural cells, 
called sensory receptors. These neurons connect to the thalamus, and 
from that, to the respective sensory areas of the cortex.

The only thing that you have to know is that in both, hearing and 
seeing, some sensory information coming from the left side goes to the 
same hemisphere (ipsilateral), and some goes to the opposite hemisphere 
(contralateral).

For hearing the cells responsible for collecting the auditory 
information are the hair cells (or auditory receptor cells). They send 
the information through the auditory nerve to the brain stem, where they 
activate other neurons, which send the information to the both thalamus 
(medial geniculate nuclei). That means, it activates the same thalamic 
nuclei (ipsilateral), and the opposite thalamic nuclei (contralateral). 
 From thalamus the information converges into the respective cerebral 
auditory cortex.

Have a look to the this link

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/anerv.html


Regards!

SJM Guzman
Visit my neurosite at
http://www.neurohost.org



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