Also previously reported is the association of the inferior and medial temporal lobe, particularly the amygdala, with social cognition deficits in FTD, areas known to be involved in the perception and recognition of facial emotions – this region was associated with performance on both the FER test (in C9orf72 and GRN mutation carriers) and FP recognition tests (in GRN mutation carriers). Here, GRN is linked to frontotemporal dementia.