Emiliano Bruner, a paleoneurologist at the Centro Nacional de Investigación sobre la Evolución Humana (CENIEH), has coordinated a study published recently in the journal Archaeological and Anthropological Sciences, on the ergonomic relationship between hand and Lower Paleolithic stone tools, in particular for choppers and handaxes.
source https://phys.org/news/2020-10-ergonomic-relationship-paleolithic-tools.html