Perceptual and physical space of vowel sounds.

Experiments were carried out to investigate the correlation between the perceptual and physical space of 11 vowel sounds. The signals were single periods out of the constant vowel part of normally spoken words of the type h (vowel)t, generated continuously by computer. Pitch, loudness, onset, and duration were equalized. These signals were presented to 15 subjects in triadic-comparison procedure, resulting in cumulative similarity matrix.