Table 2.

Average association between diffusivity measures and StimQ‐P₂ READ scores in left and right hemispheric fibre tracts, particularly supporting higher‐order association, controlling for effects of age, gender and income

White matter tract	Regions connected	Major functions	AD		MD		RD
			Left	Right	Left	Right	Left	Right
Arcuate fasciculus—anterior	Inferior frontal Caudal temporal Inferior parietal (Broca's‐Wernicke's)	Language	−8.1	−8.6	−5.4	−5.9	−4.0	−4.5
Arcuate fasciculus—long			−8.8	−8.4	−6.0	−5.9	−4.6	−4.6
Arcuate fasciculus—posterior			−10.2	−9.6	−7.0	−7.0	−5.4	−5.6
Cingulum	Frontal, parietal, medial temporal, subcortical	Emotion, learning, memory	−9.0	−9.9	−5.9	−5.8	−4.6	−3.9
Corpus callosum	Left‐right cerebral hemispheres	Communication between hemispheres	−8.7	−8.8	−5.8	−5.9	−4.4	−4.6
Frontal commissural	Frontal‐frontal	Executive	−7.3	−8.4	−5.0	−5.4	−4.0	−4.1
Inferior fronto‐occipital fasciculus	Frontal‐occipital/temporal	Association, language	−8.6	−8.9	−5.8	−5.9	−4.4	−4.4
Inferior longitudinal fasciculus	Occipital‐temporal	Visual association/imagery, language	−10.7	−9.3	−6.4	−6.0	−4.3	−4.4
Pons	Forebrain‐hindbrain (cerebellum)	Arousal, relay sensory/learning information	−7.6	−5.6	−4.7	−3.2	−3.3	−2.1
Superior longitudinal fasciculus III (ventral)	Supramarginal‐ventral prefrontal	Somatosensory, expressive language, working memory	−7.1	−8.0	−4.8	−5.6	−3.6	−4.4
Superior longitudinal fasciculus II (major)	Inferior parietal‐dorsolateral prefrontal	Visual‐spatial attention/association	−8.4	−8.9	−5.7	−6.3	−4.3	−4.9
Superior longitudinal fasciculus I (dorsal)	Superior parietal‐dorsal/medial prefrontal, supplementary motor	Motor task selection/association	−8.0	−8.6	−6.0	−6.2	−5.0	−5.1
Uncinate fasciculus	Orbitofrontal‐anterior temporal	Limbic association, language (rapid naming)	−3.6	−5.2	−2.3	−3.4	−1.6	−2.5

Values are in units of 10^‐6mm²s^‐1 per point of StimQ‐P₂ READ. Tracts with significant clusters (see Figure 2) spanning greater than 10% of their volume are in bold.