Fig. 2

a Regions in which cerebral metabolism were significantly and inversely associated with log-transformed ambient light. A whole brain analysis revealed there was a significant reduction of FDG activity with log-transformed ambient light in the left cerebellum, which was overlaid on a T1 weighted MRI template of SPM8. Blue rectangular coordinates indicated a peak level the left cerebellum (MNI coordinates: x, y, z = − 26, − 44, − 26). A color bar shows T value. b Regions in which cerebral metabolism was significantly and inversely associated with log-transformed ambient light after adjustment for age, gender and serum melatonin levels. After adjustment for age, gender and serum melatonin levels, there was a significant reduction of FDG activity with log-transformed ambient light in the left cerebellum, which was overlaid on a T1 weighted MRI template of SPM8. Blue rectangular coordinates indicated a peak level the left cerebellum (MNI coordinates: x, y, z = − 28, − 42, − 26). A color bar shows T value