Figure 2
From: Hafted technologies likely reduced stone tool-related selective pressures acting on the hominin hand
Bivariate plots of grip strength of dominant hand for the two tasks measured in time and number of strokes. Best-fit lines and individual observations are coloured by knife number. (a) grip strength and time for task 1, (b) grip strength and time for task 2, (c) grip strength and stroke count for task 1, and (d) grip strength and stroke count for task 2.
