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    Primate vocalizations exist on a spectrum from discrete to graded signals. Human speech primarily uses internally graded signals, suggesting similar perceptual mechanisms in species like Japanese macaques.

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    Area of Science:

    • Bioacoustics
    • Primate communication
    • Linguistics

    Background:

    • Primate vocalizations exist on a continuum from discrete to graded signals.
    • Signal classification depends on social structure and environmental adaptations.
    • Graded signals exhibit transitional, ontogenetic, or internal variability.

    Purpose of the Study:

    • To analyze the types of variability in graded signals.
    • To examine the nature of human speech signals.
    • To propose perceptual parallels between human and other primate vocalizations.

    Main Methods:

    • Comparative analysis of primate vocal repertoires.
    • Examination of signal variability types (transitional, ontogenetic, internal).
    • Focus on human speech signal characteristics.

    Main Results:

    • Human speech predominantly features internally graded signals.
    • This internal grading is linked to human speech perception.
    • Japanese macaque vocalizations also exhibit internal grading.

    Conclusions:

    • Human speech perception may be shaped by its internally graded nature.
    • Species with internally graded vocalizations, like Japanese macaques, may share similar perceptual phenomena.
    • Understanding signal grading is key to deciphering primate communication and perception.