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Abstract
Abstract The activity of single neurons of a metathoracic ganglion in Locusta migratoria migratorioides was recorded extracellularly in the output region of the first and second segmental nerves by means of microelectrodes. A high level of spontaneous activity has been revealed. This activity proved to be endogenous. Among spontaneously discharging neurons there occurred units with exclusively rhythmical and stable discharges which responded to afferent stimulation chiefly by inhibition. Among silent neurons there were units which needed afferent stimulation largely for initiating and maintaining a required (threshold) activity level. These neurons are compared with generatory neurons (pacemakers) in the centre of the cicada tymbal muscles. The conclusion is drawn about similar functional mechanisms of both types of neurons. In the paper is given a preliminary scheme of the functional organization of the flight control system of the locust by considering the role of pacemaker (generatory) and spontaneously discharging neurons.
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