Figure 2.

Manual size estimation (MSE) for rectangular blocks of different size (A) and maximum grip aperture (MGA) during grasping of the same objects (B). All plots have been adjusted to the same spatial scale to allow for a valid comparison of the individual scaling of finger aperture on object size. Please note that scaling of MSE and MGA on various object sizes rather than absolute measures of MSE and MGA are of importance here. Left panels, Mean data (with SE) of our patient J.S. (black symbols) and nine control subjects (gray symbols). Right panels, Mean data (with SE) of VFA patient D.F. (black symbols) and two control subjects (C.G., C.J.: gray symbols) taken from Goodale et al. (1991). Correlation coefficients for each subject are given above each plot, while the lines represent linear regressions of MSE or MGA, respectively, on object size.