The cognitive profile of posterior cortical atrophy.

Abstract:

BACKGROUND:Posterior cortical atrophy (PCA) is a progressive dementia characterized by prominent disorders of higher visual processing, affecting both dorsal and ventral streams to cause Balint's syndrome, alexia, and visual agnosia. OBJECTIVE:To define the cognitive profile of PCA and compare to the typical, primary amnestic dementia of the Alzheimer's type (DAT). METHODS:The authors used standard cognitive tests and a novel battery designed to reflect dysfunction in both ventral (Object, Face & Color Agnosia Screen [OFCAS]) and dorsal (complex pictures and compound stimuli) visual streams. The authors identified 19 patients with PCA and compared their performance to a matched group of patients with DAT and normal controls. RESULTS:Patients with PCA were younger with marked impairment in visuospatial tasks, reading, and writing but relative preservation of memory compared to DAT using standard tests. Dorsal stream signs were most prevalent among the patients with PCA with no pure ventral stream syndromes found. All novel tests distinguished reliably between subjects with complex picture descriptions and processing of compound stimuli showing the most significant differences compared to DAT. CONCLUSIONS:PCA is predominantly a dorsal stream syndrome, distinct from typical DAT, which involves occipitotemporal regions over time.

journal_name

Neurology

journal_title

Neurology

authors

McMonagle P,Deering F,Berliner Y,Kertesz A

doi

10.1212/01.wnl.0000196477.78548.db

subject

Has Abstract

pub_date

2006-02-14 00:00:00

pages

331-8

issue

3

eissn

0028-3878

issn

1526-632X

pii

66/3/331

journal_volume

66

pub_type

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