Behavioral and Brain Sciences 27 (4):468-468 (2004)

Abstract
We welcome Soltis' use of evolutionary signaling theory, but question his interpretations of colic as a signal of vigor and his explanation of abnormal high-pitched crying as a signal of poor infant quality. Instead, we suggest that these phenomena may be suboptimal by-products of a generally adaptive learning process by which infants adjust their crying levels in relation to parental responsiveness.
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DOI 10.1017/s0140525x04310101
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