Magnetic resonance imaging National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine research support non-u.s. gov't female male N.I.H. Extramural aged middle aged Comparative Study severity of illness index Psychiatric Status Rating Scales attention / physiology* interpersonal relations aging / physiology* neurodegenerative diseases / pathology emotions / physiology aging / psychology cognition disorders / psychology pmid:24951639 pmc4107746 doi:10.1093/brain/awu161 tal shany-ur nancy lin katherine p rankin activities of daily living / psychology aging / pathology alzheimer disease / pathology alzheimer disease / physiopathology alzheimer disease / psychology aphasia / pathology aphasia / physiopathology aphasia / psychology awareness / physiology* cognition disorders / pathology cognition disorders / physiopathology frontotemporal dementia / pathology frontotemporal dementia / physiopathology frontotemporal dementia / psychology neurodegenerative diseases / classification neurodegenerative diseases / physiopathology* neurodegenerative diseases / psychology reward* self-assessment*