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The Journal of Neurophysiology Vol. 82 No. 6 December 1999, pp. 3527-3540
Copyright ©1999 by the American Physiological Society
Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115
Usrey, W. Martin,
John B. Reppas, and
R.
Clay Reid.
Specificity and Strength of Retinogeniculate Connections. J. Neurophysiol. 82: 3527-3540, 1999. Retinal ganglion cells and their target neurons in the principal layers
of the lateral geniculate nucleus (LGN) of the thalamus have very
similar, center-surround receptive fields. Although some geniculate
neurons are dominated by a single retinal afferent, others receive both
strong and weak inputs from several retinal afferents. In the present
study, experiments were performed in the cat that examined the
specificity and strength of monosynaptic connections between retinal
ganglion cells and their target neurons. The responses of 205 pairs of
retinal ganglion cells and geniculate neurons with overlapping
receptive-field centers or surrounds were studied. Receptive fields
were mapped quantitatively using a white-noise stimulus; connectivity
was assessed by cross-correlating the retinal and geniculate spike
trains. Of the 205 pairs, 12 were determined to have monosynaptic
connections. Both the likelihood that cells were connected and the
strength of connections increased with increasing similarity between
retinal and geniculate receptive fields. Connections were never found
between cells with <50% spatial overlap between their centers. The
results suggest that although geniculate neurons often receive input
from several retinal afferents, these multiple afferents represent a
select subset of the retinal ganglion cells with overlapping
receptive-field centers.
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