The Manipulative Complexity of Lower Paleolithic Stone Toolmaking
Figure 2
Stability of the core-holding (left hand) and velocity profile of the hammerstone wielding hand (right hand), as well as manual video annotation of a ‘percussion’ event (Top).
Time series of the 18 joint sensors on the data glove (photo left). Period of rapid hand configuration changes (blue shaded region) frame a period of stability (clear region). This stability period corresponds to the period just before and during a percussion strike, as obtained from the manually annotated video. (Bottom) Velocity profile of the hammerstone wielding hand aligned with the plot above. The ‘percussion’ event is clearly visible in the velocity spike (top blue arrow).