Abstract
Although Alzheimer's disease (AD) involves visual association cortex, previous studies have not systematically investigated complex visual disturbances in AD. We examined 30 community-based AD patients, 13 (43%) of whom had complex visual complaints, and compared them with 30 controls on 7 types of complex visual tasks. Despite preserved visual acuity and color recognition, the AD patients were impaired in the visual evaluation of common objects, famous faces, spatial locations, and complex figures. In the AD patients, we found that all 30 had disturbances in figure-ground analysis; 17 (57%) had difficulties visually recognizing actual objects (“agnosia”); those with worse dementia disability had the most complex visual disturbances; and a subgroup (6) with Balint's syndrome performed the most poorly on the complex visual tasks. This study demonstrates that a range of complex visual disturbances are common in AD and suggests that they may result from the known neuropathology in the visual association cortex.
- © 1990 by Edgell Communications, Inc.
Letters: Rapid online correspondence
REQUIREMENTS
You must ensure that your Disclosures have been updated within the previous six months. Please go to our Submission Site to add or update your Disclosure information.
Your co-authors must send a completed Publishing Agreement Form to Neurology Staff (not necessary for the lead/corresponding author as the form below will suffice) before you upload your comment.
If you are responding to a comment that was written about an article you originally authored:
You (and co-authors) do not need to fill out forms or check disclosures as author forms are still valid
and apply to letter.
Submission specifications:
- Submissions must be < 200 words with < 5 references. Reference 1 must be the article on which you are commenting.
- Submissions should not have more than 5 authors. (Exception: original author replies can include all original authors of the article)
- Submit only on articles published within 6 months of issue date.
- Do not be redundant. Read any comments already posted on the article prior to submission.
- Submitted comments are subject to editing and editor review prior to posting.
