There are some documentaries, e.g. by David Attenborough, that dramatize the life of proto-humans (e.g. Neanderthals, etc..)
Some of these documentaries show/dramatize the proto-humans communicating in a proto-language.
The question is if this proto-language (as used in the dramatization) has any basis in research on what this proto-language could have been or sounded like, or is it just acting for the purposes of adding realism to the dramatization?
Potential options I can think of:
Indeed there has been research on proto-forms of human language and these results have been used in the documentaries
There has been research on the proto-forms of language but these have not been used as basis for the documentaries
No results are known on proto-forms of human language (and in extension none of these could have been used in documentaries)
Research has been done but no results are provided that can be used (eg in documentaries).
There are plausible speculations about forms of proto-language but not research results