Table 2 Estimated mean (standard error) values for the number of white matter streamlines in the left and right segments of the arcuate fasciculi (AF), grouped by musicianship and speech lateralization
From: Neuroanatomical correlates of musicianship in left-handers
Number of streamlinesa | Non-musicians (n = 75) | Musicians (n = 55) | ||
Left Direct AF | 499 (39) | 511 (39) | ||
Left Anterior AF | 464 (46) | 431 (48) | ||
Left Posterior AF | 890 (57) | 921 (60) | ||
Right Direct AF | 359 (41) | 277 (42) | ||
Right Anterior AF | 843 (64) | 1076 (66) | ||
Right Posterior AF | 850 (63) | 909 (65) | ||
Structural LI Direct AFb | 29.4 (47.8) | 40.8 (43.6) | ||
Structural LI Anterior AFb | —26 (34.9) | —43.8 (27.3) | ||
Structural LI Posterior AFb | 4.6 (32.1) | 0.3 (34.4) | ||
Structural LI AF (averaged)b | 2.7 (23.2) | —0.9 (18.7) | ||
Number of streamlinesa | Typical (n = 56) | Atypical (n = 19) | Typical (n = 34) | Atypical (n = 21) |
Left Direct AF | 479 (38) | 518 (65) | 535 (49) | 487 (62) |
Left Anterior AF | 599 (46) | 330 (80) | 479 (60) | 383 (76) |
Left Posterior AF | 1001 (57) | 779 (99) | 902 (75) | 941 (95) |
Right Direct AF | 275 (41) | 443 (70) | 249 (53) | 306 (67) |
Right Anterior AF | 966 (64) | 721 (110) | 1077 (83) | 1076 (106) |
Right Posterior AF | 876 (63) | 823 (109) | 910 (82) | 907 (104) |
Structural LI Direct AFb | 35.9 (47.2) | 10.2 (45.7) | 47.3 (38.3) | 30.2 (50.2) |
Structural LI Anterior AFb | —22.6 (33.2) | —36.1 (38.8) | —39.9 (26.7) | —50 (27.9) |
Structural LI Posterior AFb | 6.7 (32.2) | —1.6 (31.6) | —1.8 (29.9) | 3.6 (41.2) |
Structural LI AF (averaged)b | 6.7 (21.6) | —9.1 (24.3) | 1.8 (16.2) | —5.4 (21.8) |