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  1. Functionally Flexible Signaling and the Origin of Language.D. Kimbrough Oller & Ulrike Griebel - 2021 - Frontiers in Psychology 11:626138.
    At the earliest break of ancient hominins from their primate relatives in vocal communication, we propose a selection pressure on vocal fitness signaling by hominin infants. Exploratory vocalizations, not tied to expression of distress or immediate need, could have helped persuade parents of the wellness and viability of the infants who produced them. We hypothesize that hominin parents invested more in infants who produced such signals of fitness plentifully, neglecting or abandoning them less often than infants who produced the sounds (...)
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