Auditory-vocal communication

Human speech occurs in the auditory-vocal modality. Other properties of the auditory-vocal modality play a role in non-verbal human communication, notably limbically controlled vestigial primate vocal behaviors: laughing, crying, shrieking, sighing, etc. Other animal species have been trained to comprehend (chimps, bonobos, border collies, African grey parrots) and to produce (African grey parrots) – with intent to communicate rather than merely mimic, at least some of the time – only limited aspects of human speech.