Dopaminergic tone predicts rhythmic temporal attention in Parkinson's disease
Beat perception, the ability to perceive and anticipate a regular pulse in music, is thought to depend on the basal ganglia. Dopaminergic signaling is a candidate mechanism given its prominence in basal ganglia circuitry and established function in encoding temporal predictions. Parkinson's disease (PD) provides a model for studying dopaminergic contributions to beat perception. To test the hypothesis that higher dopaminergic tone is associated with better beat perception, we conducted a study in PD patients (n=55) and matched controls (n=53). Participants performed a musical beat perception task, the Beat Drop Alignment Test (BDAT). They also completed a non-timing control task measuring musical pitch perception, the Mistuning Perception Test (MPT). We identified a double dissociation in PD patients: daily dopamine dose was associated with beat perception (r=.37, p=.005) but not pitch perception (r=.12, p=.397), while musical background was associated with pitch perception (r=.55, p<.001) but not beat perception (r=.16, p=.236). Results remained consistent when controlling for disease duration and age. This dissociation suggests the effect of dopamine is specific to beat perception and not reflective of a general improvement in auditory processing. High-dopamine patients outperformed both low-dopamine patients and age-matched controls, and this difference was driven by better detection of on-beat than off-beat events. Together, these results suggest that dopamine is associated with enhanced beat perception, potentially through modulation of temporal attention to expected beat times.