“…The continuous adaptation of knapping methods to raw material characteristics might indicate incapacity to impose blank preparation, hierarchical reduction, and control of expected outcomes regardless of the natural constrains of the rocks, a feature later seen in Acheulean assemblages (Sánchez-Yustos, 2021). In spite of the shared operative (Cueva-Temprana et al, 2019) and artifactual (Gallotti and Mussi, 2015;Sánchez-Yustos et al, 2018) bases suggestive of a "gradual transition" (Duke et al, 2021;Sánchez-Yustos, 2021) from the Oldowan to the Acheulean, it has been said (Faisal et al, 2010;Stout et al, 2015) that distinct biological and neurological systems separate them (Isaac, 1969;Wynn, 1989;Sánchez-Yustos, 2021).…”