Abstract
We have studied the efferent commands to muscles during walking in three widely different species of cockroach and find no significant differences between them in the patterns of motor output. Several different patterns can be employed by the same species to get the same stepping rate, particularly at low speeds. As stepping rate increases, the following general trends can be seen. (a) There is recruitment of additional units, first of slow axons and then of fast. (b) The reciprocal relationship between antagonist muscles becomes less obvious, particularly with respect to the slow axon system. (c) At extremely high stepping rates the number of fast potentials becomes greatly reduced.
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