You want to see it? You want to see Scientists using data from cranial volume, mean group size, and other sources of data to establish inferences on the relative cognitive capacities of our early hominid ancestors (
despite the noted lack of access to their soft cerebral tissue)??
Start here:
Blumenberg, B. (1983).
The evolution of the advanced hominid brain.
Current Anthropology 24:5.
Barton, R.A. (1993). Independent contrasts analysis of neocortical size and socioecology in primates.
Behavioral and Brain Sciences 16:04, 694.
Dunbar, R.I.M. (1993). Coevolution of neocortical size, group size and language in humans.
Behavioral and Brain Sciences 16:04, 681.
Hyland, M.E. (1993). Size of human groups during the Paleolithic and the evolutionary significance of increased group size.
Behavioral and Brain Sciences 16:04, 709.
Henneberg, M. (1987). Hominid cranial capacity change through time: a Darwinian process.
Human Evolution 2:3, 213-220.
Janson, C.H. (1993). Primate group size, brains and communication: A New World perspective.
Behavioral and Brain Sciences 16:04, 711.
Leigh, S.R. (1992). Cranial capacity evolution in Homo erectus and early Homo sapiens.
American Journal of Physical Anthropology 87:1, 1-13.
McPherron, S.P. (2000). Handaxes as a measure of the mental capabilities of early hominids.
Journal of Archaeological Science.
Stanyon, R., Consigliere, S., & Morescalchi, M.A. (1993). Cranial capacity in hominid evolution.
Human Evolution 8:3, 205-216.
Wynn, T. (1981). The intelligence of Oldowan humans.
Journal of Human Evolution.
Wynn, T. (1985). Piaget, stone tools and the evolution of human intelligence.
World Archaeology.
This list is only a small selection of articles that use information on cranial capacity, known tool use, calculations of neocortical volume, and numerous other sources of data to make inferences about the cognitive capacities of our ancestors, including their relative intelligence.