prov:value
| - Expressive behaviors of infants and children with various forms of disability have been described as muted, hard-to-read, or excessively labile and incongruous, depending on the population under study (Mundy, Yirmiya, & Sigman, 1990; Kasari & Sigman, 1996; Sigman, Kasari, Kwon, & Yirmiya, 1992).
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