Pyramidal Arborizations and Activity Spread in Neocortex
Adrian Robert, July 1998
A model of a patch of neocortex was constructed by reference to the details of
pyramidal and inhibitory arbors in rat somatosensory cortex, and its behavior
was compared to slice experiments measuring activity spread following
point-stimulation. Two features of pyramidal arbors played a prominent role
in the results and may affect cortical information transmission: 1) dual
horizontal structure, in which connections are made densely within 0.5 mm and
sparsely over 2-3 mm -- affected characteristic length and rate of
propagation; 2) significant restriction of projections to the vertical
compartment (superficial, middle, deep) of origin -- resulted in laminar
differences in activity levels.
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