Model Neural Networks and Behavior by Peter A. Getting, Michael S. Dekin (auth.), Allen I.
By Peter A. Getting, Michael S. Dekin (auth.), Allen I. Selverston (eds.)
The such a lot conspicuous functionality of the frightened approach is to manage animal behav ior. From the complicated operations of studying and mentation to the molecular con figuration of ionic channels, the frightened procedure serves because the interface among an animal and its atmosphere. to check and comprehend the elemental mecha nisms underlying the keep an eye on of habit, it is usually either precious and fascinating to hire organic platforms with features in particular compatible for answering particular questions. In neurobiology, many invertebrates became verified as version platforms for investigations at either the platforms and the mobile point. huge, conveniently identifiable neurons have made invertebrates specifically beneficial for mobile experiences. the truth that those neurons happen in a lot smaller numbers than these in greater animals additionally makes them vital for circuit research. even though very important alterations exist, the various questions that may be tech nically very unlikely to respond to with vertebrates can turn into experimentally tractable with invertebrates.
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The time of depression is monitored extracellularly by recording en passant from the axons of dorsal longitudinal motoneurons (DL) in nerve 6 of the prothoracic ganglion (cut distally). (C) Stimulation of 301 with a longduration (monitored with the current trace, i) pulse of constant depolarizing current (about 10 nA) induces rhythmical bursting activity in 501 and dorsal longitudinal motoneurons. Note that the cyde frequency and the phase relationships of the bursting neurons are similar to those observed in the central motor pattern (compare with B).
The maintenance of the cocontraction phase is achieved by the combination of two mechanisms. The first is direct excitatory coupling of the fast extensor tibiae 24 R. MELDRUM ROBERTSON AND KEIR G. PEARSON motoneuron to flexor motoneurons, and the second is positive feedback from leg receptors to both groups of motoneurons. Numerous afferents contribute to this feedback during cocontraction (Heitler and BUITows, 1977b), the most obvious being cuticular receptors activated by deformations of the cutide.
It is likely that still additional mechanisms will be forthcoming. Whether or not the polymorhpic network idea is a viable concept for explaining the organization of motor systems in general remains to be seen. We have evidence in Tritonia that a single network of premotor interneurons participates in the generation of two different motor patterns and that the functional interactions within the network can be reorganized into several circuit configurations. The application of this idea to other systems will depend on identifying the relevant interneuronal pools and on characterizing mechanisms for configuring these interneurons into circuits.