Figure 2.

Behavioral performance. Performance accuracy and response time for the haptic task (A, B) and for the visual task (D, E). Asterisks indicate the results of post hoc pairwise comparisons between object categories (with a Sidak–Bonferroni correction). C, Difference in accuracy indicates the relative performance accuracy for hand recognition (calculated as performance accuracy for the hand recognition − performance accuracy for the other two object categories). We found a significant correlation between the age at onset of total blindness and the relative performance accuracy scores (Spearman's ρ = 0.34, p < 0.05). Data are presented as the mean ± SEM of 28 blind and 28 sighted subjects.