borderline significantP = 0.060
However, in the impaired group, the relationship between IPS and K 1 of total GM ( ρ = 0.65, P = 0.042) and K 1 of cortical GM ( ρ = 0.69, P = 0.026) was significant and several other PET measures showed borderline significant correlations with IPS (cortical GM V T : ρ = 0.61, P = 0.060); hippocampus K 1 : ρ = 0.63, P = 0.063; hippocampus V T : ρ = 0.61, P = 0.062; thalamus V T : ρ = 0.60, P = 0.069).