Abstract
Rat fetuses were observed directly in different micro-environments (in utero and ex utero) on successive days during the last third of gestation. Synchronous movements comprising two or more regions of the body became common on day 17 of gestation and were especially prevalent ex utero. Their occurrence could not be explained satisfactorily by a stochastic model involving chance association of individual body regions. If synchronized movements are considered as evidence of behavioural organization, then fetal behaviour appears more diverse than previously recognized and exhibits specific linkages between body regions that imply emergent coordination and the prenatal development of species-typical action patterns.
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