Figure 4.

Relationship between fractional anisotropy (FA) and behavioral indices for a range of different tasks. Brain images show voxels where a significant correlation was found. Scatter plots illustrate spread of behavioral and fractional anisotropy values across subjects. (A) Individuals with higher callosal fractional anisotropy performed better at an asynchronous bimanual finger-tapping task (closed circles represent males, open circles females). (B) Counter-intuitively, individuals with higher fractional anisotropy in the right optic radiation (OR) performed worse on a choice reaction time task (i.e., had higher reaction times). (C) Individuals with higher fractional anisotropy averaged over tracts arising from Broca's area were better at implicitly extracting grammatical rules from artificial grammars. (D) Higher fractional anisotropy in the fornix tail was found to be associated with significantly better recollection memory. (A) Adapted from Johansen-Berg et al. (2007) with permission; (B) adapted from Tuch et al. (2005) with permission; (C) adapted from Floel et al. (2009) with permission; (D) adapted from Rudebeck et al. (2009) with permission.