TABLE 2.
Number of tracts showing increased QA as a function of higher lifetime choir singing experience.
| Tract | Hemisphere | All | Young | Middle‐aged | Older |
|---|---|---|---|---|---|
| 20–39 years | 40–59 years | 60+ years | |||
| Association | |||||
| AF | R | ‐ | 38 | ‐ | ‐ |
| L | 201 | 36 | ‐ | ‐ | |
| Cingulum | R | 15 | ‐ | ‐ | ‐ |
| L | 74 | 13 | ‐ | ‐ | |
| Extreme capsule | R | 6 | ‐ | ‐ | ‐ |
| L | ‐ | ‐ | ‐ | ‐ | |
| ILF | R | 8 | ‐ | ‐ | ‐ |
| L | 11 | ‐ | ‐ | ‐ | |
| IFOF | R | 568 | ‐ | ‐ | ‐ |
| L | 386 | 20 | ‐ | ‐ | |
| Uncinate fasciculus | R | ‐ | 5 | ‐ | ‐ |
| L | ‐ | 32 | ‐ | ‐ | |
| Commissural | |||||
| AC | R/L | 7 | ‐ | ‐ | ‐ |
| CC | R/L | 7481 | 3164 | 52 | 20 |
| Projection | |||||
| Corticopontine | R | 365 | 20 | ‐ | ‐ |
| L | 264 | 205 | ‐ | ‐ | |
| Corticospinal | R | 3275 | 1539 | 56 | ‐ |
| L | 445 | 630 | ‐ | ‐ | |
| Corticostriatal | R | 101 | 18 | ‐ | ‐ |
| L | 98 | 9 | ‐ | ‐ | |
| Dentatorubrothalamic | R | 446 | 25 | ‐ | ‐ |
| L | 5 | ‐ | ‐ | ‐ | |
| Medial lemniscus | R | 664 | 132 | ‐ | ‐ |
| L | 48 | 41 | ‐ | ‐ | |
| Fornix | R | ‐ | ‐ | ‐ | 5 |
| L | ‐ | ‐ | ‐ | 7 | |
| Thalamic radiation | R | 115 | ‐ | ‐ | ‐ |
| L | 14 | ‐ | ‐ | ‐ | |
| Cerebellar | |||||
| Cerebellum | R | ‐ | 59 | ‐ | ‐ |
| L | ‐ | ‐ | ‐ | ‐ | |
Note: Analyses corrected for multiple comparisons (Bonferroni) and surviving tracts with N < 5 rejected. No decreasing trends for QA were found.
Abbreviations: AC, anterior commissure; AF, arcuate fasciculus; CC, corpus callosum; IFOF, inferior fronto‐occipital fasciculus; ILF, inferior longitudinal fasciculus; MLF, middle longitudinal fasciculus.