Format

Send to:

Choose Destination
See comment in PubMed Commons below
Cogn Behav Neurol. 2005 Sep;18(3):151-8.

Characteristics of visual target influence detection of change in naturalistic scenes in Alzheimer disease.

Author information

  • 1Department of Psychology, Bridgewater State College, Bridgewater, Massachusetts 02325, USA. sneargarder@bridgew.edu

Abstract

OBJECTIVE:

To examine the role of visual characteristics of the target on Alzheimer disease (AD) patients' ability to detect change in naturalistic scenes.

BACKGROUND:

AD patients exhibit impairments in detecting changes in the visual environment. Unexamined to date is the influence of visual characteristics of the target on this ability.

METHOD:

The change-detection experiment used 36 pairs of photographs of naturalistic scenes. Each pair was identical except for one target that differed in color, gray-scale, or presence/absence. Scene complexity also varied. The task was to locate the target; reaction times (RTs) were recorded.

RESULTS:

RTs increased as scene complexity increased. AD patients exhibited slower RTs than elderly adult controls (ECs), who were slower than young adults (N = 14/group). AD patients were unable to locate the target in 33.3% to 61.9% of the complex gray-scale trials, compared with 4.8% to 38.1% in the EC group. Performance on color and presence/absence trials was relatively good for all groups.

CONCLUSIONS:

The ability of AD patients to detect change in simulated real-world scenes is influenced by visual characteristics of the target and by scene complexity.

PMID:
16175018
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Lippincott Williams & Wilkins
    Loading ...
    Write to the Help Desk