Origin of speech
The origin of speech differs from the origin of language because language is not necessarily spoken; it could equally be written or signed. Speech is a fundamental aspect of human communication and plays a vital role in the everyday lives of humans. It allows them to convey thoughts, emotions, and ideas, and providing the ability to connect with others and shape collective reality. Many attempts have been made to explain scientifically how speech emerged in humans, although to date no theory has generated agreement. A striking feature of language is that it is modality-independent. Should an impaired child be prevented from hearing or producing sound, its innate capacity to master a language may equally find expression in signing. Sign languages of the deaf are independently invented and have all the major properties of spoken language except for the modality of transmission. From this it appears that the language centres of the human brain must have evolved to function optimally, irrespective...
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