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Interlimb coordination is more typically alternating than synchronous. Each histogram plots the incidence, across all crawling cycles, of initiation of stance of the indicated limb with respect to the step cycle of the reference leg. Histograms for each crawling style are stacked. Whereas scooters (grey bars) and some three-limbed crawlers (open bars: sna, twm2) used limbs in synchrony, most infants showed alternation of homologous and ipsilateral limbs. Bin width: 2%.
