Takeuchi H, Taki Y, Sekiguchi A, et al. Regional gray matter density is associated with morningness-eveningness: Evidence from voxel-based morphometry. Neuroimage. 2015;117:294-304. doi:10.1016/j.neuroimage.2015.05.037 from https://pubmed.ncbi.nlm.nih.gov/26003859/
> 432 healthy men and 344 healthy women (age, 20.7±1.8years)
> We demonstrated that morningness (less eveningness) was associated with (a) lower regional gray matter density (rGMD) in the precuneus and adjacent areas, (b) lower rGMD in the left posterior parietal cortex and adjacent areas, and (c) higher rGMD in the bilateral orbitofrontal cortex. Further, our exploratory analyses revealed that (d) higher rGMD in hypothalamic areas around the bilateral suprachiasmatic nuclei were associated with morningness.
> 432 healthy men and 344 healthy women (age, 20.7±1.8years)
> We demonstrated that morningness (less eveningness) was associated with (a) lower regional gray matter density (rGMD) in the precuneus and adjacent areas, (b) lower rGMD in the left posterior parietal cortex and adjacent areas, and (c) higher rGMD in the bilateral orbitofrontal cortex. Further, our exploratory analyses revealed that (d) higher rGMD in hypothalamic areas around the bilateral suprachiasmatic nuclei were associated with morningness.