. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 156 G. F. GWILLIAM. ''•'.•fffffjfiwti'i, FIGURE 9. Hypothetical circuit to account for reciprocity in the output of the burster cells in Balauus. Upper left inset illustrates events at the numbered positions indicated on the diagram. Upper trace indicates light-on (upward deflection) and light-off (from Millecchia and Gwilliam, 1972). 1 shows photoreceptor; 2, photoreceptor axon; 3, second-order cell in supra-esophageal ganglion; 4, fibers in circumesophageal connective. Sine-wave symbol indicates an "oscillator" o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 156 G. F. GWILLIAM. ''•'.•fffffjfiwti'i, FIGURE 9. Hypothetical circuit to account for reciprocity in the output of the burster cells in Balauus. Upper left inset illustrates events at the numbered positions indicated on the diagram. Upper trace indicates light-on (upward deflection) and light-off (from Millecchia and Gwilliam, 1972). 1 shows photoreceptor; 2, photoreceptor axon; 3, second-order cell in supra-esophageal ganglion; 4, fibers in circumesophageal connective. Sine-wave symbol indicates an "oscillator" of unknown type. Upper and lower records illustrate effect of "light-off" (downward deflection of second beam) on LEB and MIB respectively. Middle traces illustrate normal bursting reciprocity. E. represents an excitatory synapse; I an inhibitory synapse. report is an initial survey and is intended to be primarily descriptive of the neurons, their locations in the ganglion, and some of the properties that will permit charac- terization of the units. The rigorous demonstration of particular units controlling particular muscles has begun, and the general temporal relationship between the bursters and actions of muscles in extension and retraction has been established. While the presence of a number of types of cells is recognized, interest has centered on those cells designated as bursters. This is not to imply that other units lack patterned activity, but the same kind of link to behavior as is seen in the bursters has not been established. If one examines the output of the burster cells, it is not necessary to invoke peripheral inhibition to account for the normal extension-retraction activity. It can be seen from the records that the two types of bursters are reciprocal, that one is inhibited and the other is excited by the shadow. This kind of neuronal activity can account for much of the behavior in the intact animal given the assumption, supported by evidence,
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
