Alzheimer disease 1 Article 1 PCA 1 adult 1 aged 1 arousal 1 brain cortex atrophy 1 brain function 1 brain region 1 category specific impairments clinical article 1 cohort analysis 1 controlled study 1 embodiment cognition 1 female 1 human 1 male 1 middle aged 1 patient participation 1 posterior cortical atrophy 1 posterior parietal cortex 1 psycholinguistics 1 recall 1 retrospective study 1 semantic memory 1 semantic processing 1 sensorimotor cortex 1 spatial behavior 1 spatial language processing 1 spatial prepositions 1