In cognitive archaeology, the 'material engagement theory' suggests that human cognitive evolution is not merely an internal neural process but is actively constituted by engagement with material culture. Archaeologist Dr. Linnea Thorpe argues that the development of complex hierarchical planning in early hominins was catalyzed specifically by the sequential, multi-stage manufacture of symmetrical Acheulean handaxes, rather than by a pre-existing general cognitive capacity for planning. Thorpe contends that the physical, tactile feedback of shaping symmetrical stone tools forced a neurological feedback loop that recruited and reorganized premotor regions of the brain. To evaluate this hypothesis, researchers conducted a study mapping the brain activity of modern subjects with no prior knapping experience as they learned to manufacture either symmetrical Acheulean handaxes or simpler, non-symmetrical Oldowan flakes (which require only single-stage, ad-hoc strikes). Which finding from the study, if true, would most directly support Thorpe’s hypothesis?
- AParticipants who scored highest on pre-training assessments of general hierarchical planning ability mastered the production of symmetrical Acheulean handaxes more rapidly than did participants with lower pre-training planning scores.
- BThroughout the study, participants in both the handaxe and flake groups demonstrated similar levels of activation in brain regions associated with basic visual processing and motor control.
- Participants learning to manufacture Acheulean handaxes exhibited progressive structural reorganization in premotor regions that correlated with their increasing precision in tool symmetry, while participants learning to produce simpler, non-symmetrical flakes showed no such neural changes.Answer
- DParticipants who practiced handaxe knapping demonstrated significant improvements in general planning tasks after the study, even if their manufactured handaxes consistently failed to achieve bilateral symmetry.