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Journal of Neuroscience, Vol 9, 4388-4399, Copyright © 1989 by Society for Neuroscience
Multiple electrosensory maps in the medulla of weakly electric gymnotiform fish. I. Physiological differences
CA Shumway
Neurobiology Unit, Scripps Institution of Oceanography, UCSD, La Jolla, California 92093.
The electrosensory lateral line lobe in the weakly electric gymnotiform
fish Eigenmannia contains 3 topographic maps of high-frequency (tuberous)
electroreceptive information from the body surface. The maps receive
identical primary afferent input since axonal collaterals of both
amplitude- and phase-coding afferents project to all 3 maps (Heiligenberg
and Dye, 1982). Response properties of the amplitude- coding pyramidal
neurons in the multiple maps were investigated in order to determine
whether the maps differ physiologically. Units in the lateral map have
larger receptive fields and are more sensitive than units in the
centromedial map. The former units respond more phasically and with shorter
latencies to step changes in stimulus amplitude (measured from the stimulus
onset to the maximum response). Although 75% of pyramidal cells in all maps
show a center-surround receptive-field organization, the strength of the
inhibitory surround varies among maps, tending to be weakest for units in
the lateral map and strongest for units in the centromedial map. Pyramidal
neurons also differ in their responses with respect to the temporal
frequency of amplitude modulations; the majority of units in the lateral
map prefer high temporal frequencies, while those in the centromedial map
prefer low frequencies. These results suggest that the multiple
electrosensory maps could provide the initial separation of spatial and
temporal processing of sensory information, much as has been suggested for
X and Y ganglion cells in the cat retina (Shapley and Perry, 1986). The
centromedial map could provide high spatial contrast with correspondingly
poor temporal resolution, while the more sensitive units in the lateral map
could best provide information about temporal changes in stimulus
amplitude.
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