Falk is right that the phonetic aspects of motherese are derived from primate vocalizations.
Species-typical vocalizations such as crying and laughing are under minimal conscious control and are poor candidates for behavioral shaping.
Other differences between the repertories appear in the neumatic notation and in the vocalizations known as teretismoi.
Since these vocalizations are emitted before and during a play bout, they may carry some metacommunicative value.
The procedure described above yielded a total of 193 vocalizations (mean rate of vocal production : 1.97 vocalizations/minute).
The modelled species responded 26 times during trials that included their vocalizations, and five times when they were considered heterospecifics.
Crying and whining were both considered to be negative vocalizations, as were sighing, fussing and sounds of discomfort.
No single consonant or vowel segments, vegetative sounds, or vocalizations not determined to be canonical babbling were analyzed.
