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Cognitive and Communicative Factors Underlying Language
Darwin and Negus
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ability acoustic activity adult human air pressure anatomical animals appear approximation area function articulatory aspects base behavior brain calls cavity changes Chapelle-aux-Saints Chapter chimpanzee closed communication comparative complex derived determined discussed distinct effect encoding energy evolution example fact factors Figure filter follows formant frequencies forms fossil function fundamental frequency gestures graph hominids Homo sapiens human language human speech important involve larynx length Lieberman linguistic lips listeners mandible means mechanisms move muscles natural Neandertal necessary neural newborn nonhuman primates normal Note observed occur particular pattern perception period pharynx phonetic phonetic features plotted position possible present probably produce properties range recorded relatively represent selective sentence shape signals similar simply skull sounds speaker species spectrogram speech production structure studies supralaryngeal vocal tract theory tion tongue tube variations vocal cords vowel wave waveform