The coding of signals in the electric communication of the gymnotiform fish Eigenmannia: From electroreceptors to neurons in the torus semicircularis of the midbrain |
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Authors: | Walter Metzner Walter Heiligenberg |
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Institution: | (1) Neurobiology Unit, Scripps Institution of Oceanography, University of California at San Diego, 92093-0202 La Jolla, CA, USA |
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Abstract: | Summary In the context of aggression and courtship, Eigenmannia repeatedly interrupts its electric organ discharges (EODs) These interruptions (Fig. 1) contain low-frequency components as well as high-frequency transients and, therefore, stimulate ampullary and tuberous electroreceptors, respectively (Figs. 2, 3). Information provided by these two classes of receptors is relayed along separate pathways, via the electrosensory lateral line lobe (ELL) of the hindbrain, to the dorsal torus semicircularis (TSd) of the midbrain. Some neurons of the torus receive inputs from both types of receptors (Figs. 14, 15), and some respond predominantly to EOD interruptions while being rather insensitive to other forms of signal modulations (Figs. 12, 13). This high selectivity appears to result from convergence and gating of inputs from individually less selective neurons.Abbreviations
CP
central posterior thalamic nucleus
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Df
frequency difference between neighbor's EOD and fish's own
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DPn
dorsal posterior nucleus (thalamus)
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EOD
electric organ discharge
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ELL
electrosensory lateral line lobe
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JAR
jamming avoidance response
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LMR
lateral mesencephalic reticular formation
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nE
nucleus electrosensorius
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nEb
nucleus electrosensorius, beat-related area
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nE
nucleus electrosensorius, area causing rise of EOD frequency
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nE
nucleus electrosensorius, area causing fall of EOD frequency
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nEar
nucleus electrosensorius-acusticolateralis area
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NPd
nucleus praeeminentialis, pars dorsalis
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PPn
prepacemaker nucleus
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PT
pretectal nucleus
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SE
nucleus subelectrosensorius
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TeO
optic tectum
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TSd
dorsal (electrosensory) torus semicircularis
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TSv
ventral (mechano-sensory and auditory) torus semicircularis |
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Keywords: | Electrosensation Social communication Sensory periphery Mesencephalon |
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