These regions include the medulla, pons, midbrain, cerebellum, and cortex. Interestingly, while the input from these regions is broad, it also shows biases toward specific subsets of V1 interneurons.

White arrows indicate accumulation of 18F-SPAL-T-06, suggesting α-synuclein aggregates in the putamen, yellow arrows in the pons, yellow triangle in the cerebellar white matter, and white ...