As discussed in Chapter 3, the fundamental properties of myosin and actin are largely conserved across mammals. Therefore, the motor command computations in the motor cortex, cerebellum, and basal ganglia should be performed in comparable time windows, and the command signals to the spinal cord should be delivered within the same time range in different species. However, the distances of these structures vary by orders of magnitude across species. Thus, all of the timing constraints required for adequate function have to be reconciled with the complexity imposed by the growing size of the
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