Hypothetical vowel space triangles for /a/, /i/, and /u/ in speech directed to adults (ADS, orange) and speech directed to infants (IDS, blue). (IMAGE)

International Research Center for Neurointelligence (WPI-IRCN), The University of Tokyo

Hypothetical vowel space triangles for /a/, /i/, and /u/ in speech directed to adults (ADS, orange) and speech directed to infants (IDS, blue).

Caption

The x-axis represents the average value of each vowel on the first formant (F1, relates to how high or low the tongue is during the vowel production), the y-axis the same on the second formant (F2, relates to how forward or backward the tongue is in the mouth during vowel production). The larger vowel space triangle in IDS represents the exaggeration of vowels.

Credit

Irena Lovčević, International Research Center for Neurointelligence (WPI-IRCN), The University of Tokyo

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