Abstract
Spontaneous kicking of a single leg in normal, month-old infants who are crying in anticipation of a feeding shows a morphological and temporal structure similar to that of a single limb in mature locomotion in a number of species. These results support the probability that human locomotion, like that of other species, is controlled by a central program. The program is manifest in human infants long before actual walking matures and functions in the absence of some sensory signals believed necessary in mature locomotion.
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