Parkinson's disease (PD) is associated with irreparable damage to dopaminergic neurons in brain areas involved in movement. Frequently, a very early symptom is an impaired sense of smell, but the associated brain-wide mechanisms remain unclear. Here, we report on aberrations in BOLD-fMRI responses along olfactory pathway in a PD mouse model. We find decreased activation, especially in the main olfactory bulb, olfactory tubercle and piriform cortex in PD mice when compared to healthy controls upon olfactory stimulation.
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