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Demonstration of sleepiness (KSS scores)-associated thalamic gray matter volume in younger and older adults. The plots show the age interaction effect suggesting that sleepiness is negatively associated with left and right thalamus gray matter volume in older adults, but positively associated in younger individuals. The colors in the brain plot represent statistical t-values ranging from 0 (black) to 5.0 (white).
Abbreviation: KSS, Karolinska Sleepiness Scale.
