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Journal of Neuroscience, Vol 9, 2313-2326, Copyright © 1989 by Society for Neuroscience
Segregation and overlap of callosal and association neurons in frontal and parietal cortices of primates: a spectral and coherency analysis
PB Johnson, A Angelucci, RM Ziparo, D Minciacchi, M Bentivoglio and R Caminiti
Institute of Physiology, University of Rome La Sapienza, Italy.
The spatial relations between selected classes of association and callosal
neurons were studied in the frontal and parietal lobes of the macaque
monkey using retrogradely transported fluorescent dyes. Fast blue and
nuclear yellow were injected in the left frontal (areas 4 and 6) and right
posterior parietal (area 5) cortices, respectively. These injections led to
the retrograde labeling, in the right frontal cortex, of callosal neurons
projecting homotopically and association neurons projecting to ipsilateral
area 5; in the left superior parietal lobule, of callosal neurons
projecting to contralateral area 5 and association neurons projecting to
the ipsilateral frontal lobe. In both frontal and parietal cortices,
callosal and association neurons were located in layers III and V-VI; a few
neurons were also found in layer II. The contribution of layers V-VI to the
callosum was significantly higher in areas 4 and 6 than in area 5. Only a
small number of neurons (less than 1%) were double labeled. Spectral
analyses were used to characterize the spatial periodicities of the
distributions of callosal and association neurons. In areas 4, 6, and 5,
both association and callosal spectra were dominated by a strong elevation
in the range of low spatial frequencies, corresponding to periodicities in
cell density with a peak-to-peak distance of about 8 mm. This indicated an
arrangement of these corticocortical cells in the form of bands. The latter
displayed various shapes and orientations and were composed of more
discrete assemblies of cell clusters of about 400-1000 microns width. Their
presence was revealed in the power spectra by a small elevation in the
range of high spatial frequencies. The coherency analysis assessed the
degree of linear relationships for each spatial frequency, and therefore
the degree of similarity, between callosal and association cell
distributions, together with their phase relations. Little coherency was
found in areas 4 and 6 between bands of callosal and association neurons,
which suggests that the 2 cell populations are differently and
independently distributed in the tangential domain, with no simple phase
relations. The overall mean coherency was higher in area 5 than in the
frontal cortex: callosal and association bands were more similar in shape,
with more extensive zones of overlap. These data indicate that callosal and
association neurons share common principles of spatial organization despite
the great regional variability of their interrelations in the tangential
cortical domain.(ABSTRACT TRUNCATED AT 400 WORDS)
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