Fig. 6: Correlations between white matter tract anatomy and volitional gestural communication as indexed by the initiation of a behavioral request (IBR) task.
From: Individual variation in the chimpanzee arcuate fasciculus predicts vocal and gestural communication
A Increasing IBR performance was associated with higher mean fractional anisotropy (FA) values in the arcuate fasciculus (r(43) = 0.364, p = 0.014). B Better IBR performance correlates with increased leftward asymmetry in the volume of the superior longitudinal fasciculus (SLF) (r(54) = 0.305, p = 0.02. C Increasing IBR performance correlates with greater leftward asymmetry in FA values for the SLF(r(54) = −0.432, p = 0.001). D No significant relationship between gestural initiation of a behavioral request (IBR) and asymmetry of fractional anisotropy values within the corticospinal tract (CST) (r(63) = −0.160, p = 0.102).
