. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Electroreceptors S-type o tuberous electroreceptor Figure 3. Comparison of differential phase coding systems in Gymnarchus and Eigenmannia. S-type and T-type electroreceptor afferents, giant cells, and spherical cells tire an action potential for one stimulus cycle, thus encoding absolute phase at each electroreceptor organ. Neurons in the inner cell layer (ICL) in the ELL in Gymnarchus and small cells in lamina VI of the torus semicircularis in the midbram in Eigeiunanniu receive such phase-locked inputs from different body
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Electroreceptors S-type o tuberous electroreceptor Figure 3. Comparison of differential phase coding systems in Gymnarchus and Eigenmannia. S-type and T-type electroreceptor afferents, giant cells, and spherical cells tire an action potential for one stimulus cycle, thus encoding absolute phase at each electroreceptor organ. Neurons in the inner cell layer (ICL) in the ELL in Gymnarchus and small cells in lamina VI of the torus semicircularis in the midbram in Eigeiunanniu receive such phase-locked inputs from different body areas and respond to the phase difference between them. The nature of the synapses in Gymnarchus is not known. Synapses represented by the resistor notation in Eigenmannia are of mixed type. mannia fire one action potential for each stimulus cycle encoding phase information (Scheich el ai, 1973). Their sole projection is made to the somata of spherical cells in the ELL. The response of the spherical cells is also phase preserving, responding to each cycle of electrosensory stimulus by an action potential. Unlike in Gymnarchus in which the first central neurons, the giant cells in the ELL, bilaterally spread their axons for differential phase computation within the ELL, the spherical cells in Eige- nmannia do not spread any processes within the ELL— they project single axons to lamina VI of the torus semi- circularis in the midbrain. There they synapse onto the somata of the giant cells that then spread large axonal arbors for differential phase comparison. The small cells in the lamina VI receive inputs from the giant cells and the spherical cells and respond to the phase difference between these inputs (Fig. 3) (Carr ft a/., 1982, 1986a, b; Heiligenberg and Rose, 1985). Comparative Implication Thus, the function of differential phase comparison, one of the essential computational elements for the JAR, is assigned to different brain structures in Gymnarchus and Eigenmannia.
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