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The transition from the Acheulean to the Middle Palaeolithic represents a critical threshold in human evolution when archaic behaviour patterns gave way to the Levallois stone tool technology that characterizes later Pleistocene hominins including Homo neanderthalensis and early Homo sapiens. This article examines that transition through a comparative perspective on handaxes and cleavers (collectively referred to here as bifaces) from the site of Bhimbetka in central India. The Bhimbetka bifaces are compared to those from Patpara, another transitional assemblage in central India, as well as non-transitional Indian Acheulean assemblages. Bhimbetka and Patpara share unusually refined bifaces. While this refinement is attributed to invasive flaking at Patpara, at Bhimbetka it appears to be related to the ability to strike large thin flake blanks. These both have consequences for biface symmetry, with Patpara handaxes being particularly symmetrical in profile, while Bhimbetka cleavers are particularly symmetrical in section. Unlike Patpara, most of the Bhimbetka bifaces have not undergone resharpening. However, cleavers from the two sites do share unusually high rates of damage on their bits and the occasional use of cleavers as notches. It is argued that, while the transition at the two sites occurred independently, it was underpinned by the same cognitive pattern: an increased capacity for hierarchical organization. [ABSTRACT FROM PUBLISHER]