Olfactory memory dysfunction commonly occurs early and before other cognitive deficits in neurodegenerative diseases (Hawkes, 2003; Dintica et al., 2019), and is associated with tau pathology progression in Alzheimer's disease and frontotemporal dementia patients (Pardini et al., 2009; Lu et al., 2019). This evidence concerns the gene MAPT and neurodegenerative disease.