From: Morphine modulation of pain processing in medial and lateral pain pathways
 |  |  | Pre | Post | ||
---|---|---|---|---|---|---|
Treatment | Brain areas | n | Responsive | Non-responsive | Responsive | Non-responsive |
Morphine | SI | 62 | 51 (82%) | 11 | 41 (66%)* | 21 |
 | VPL | 53 | 50 (94%) | 3 | 30 (57%)*** | 23 |
 | ACC | 42 | 21 (50%) | 21 | 10 (24%)* | 32 |
 | MD | 61 | 31 (51%) | 30 | 11 (18%)*** | 50 |
NS | SI | 69 | 57 (83%) | 12 | 55 (80%) | 14 |
 | VPL | 51 | 44 (86%) | 7 | 47 (92%) | 4 |
 | ACC | 42 | 22 (52%) | 20 | 19 (45%) | 23 |
 | MD | 58 | 28 (48%) | 30 | 26 (45%) | 32 |