In contrast, changes in SC–FC coupling in PD low visual performers (compared to high visual performers) were not significantly correlated with changes in dopaminergic but rather to cholinergic (CHRNA2, CHRNA3, CHRNA4), serotoninergic (HTR1A, HTR5A) and noradrenergic (ADRA2A) receptors (Fig. 5B, Table 3 and Supplementary Table 3 for the full neurotransmitter gene expression results). This evidence concerns the gene CHRNA4 and Parkinson disease.