Effects of lighting variability on locomotion in posterior cortical atrophy.
Alzheimer's disease
dementia
locomotion
posterior cortical atrophy
visual perception
Journal
Alzheimer's & dementia (New York, N. Y.)
ISSN: 2352-8737
Titre abrégé: Alzheimers Dement (N Y)
Pays: United States
ID NLM: 101650118
Informations de publication
Date de publication:
2020
2020
Historique:
received:
10
03
2020
revised:
10
07
2020
accepted:
28
07
2020
entrez:
12
10
2020
pubmed:
13
10
2020
medline:
13
10
2020
Statut:
epublish
Résumé
Clinical reports describe patients with Alzheimer's disease (AD) exhibiting atypical adaptive walking responses to the visual environment; however, there is limited empirical investigation of such behaviors or factors modulating their expression. We aim to evaluate effects of lighting-based interventions and clinical presentation (visual- vs memory-led) on walking function in participants with posterior cortical atrophy (PCA) and typical AD (tAD). Participants with PCA (n = 10), tAD (n = 9), and healthy controls (n = 12) walked to visible target destinations under different lighting conditions within two pilot repeated-measures design investigations (Experiment 1: 32 trials per participant; Experiment 2: 36 trials per participant). Participants walked to destinations with the floorpath interrupted by shadows varying in spatial extent (Experiment 1: no, medium, high shadow) or with different localized parts of the environment illuminated (Experiment 2: target, middle, or distractor illuminated). The primary study outcome for both experimental tasks was completion time; secondary kinematic outcomes were proportions of steps identified as outliers (Experiment 1) and walking path directness (Experiment 2). In Experiment 1, PCA participants overall demonstrated modest reductions in time taken to reach destinations when walking to destinations uninterrupted by shadows compared to high shadow conditions (7.1% reduction [95% confidence interval 2.5, 11.5; Findings represent a quantitative characterization of a clinical phenomenon involving patients misperceiving shadows, implicating dementia-related cortico-visual impairments. Results contribute to evidence-based design guidelines for dementia-friendly environments.
Identifiants
pubmed: 33043109
doi: 10.1002/trc2.12077
pii: TRC212077
pmc: PMC7539669
doi:
Types de publication
Journal Article
Langues
eng
Pagination
e12077Informations de copyright
© 2020 The Authors. Alzheimer's & Dementia: Translational Research & Clinical Interventions published by Wiley Periodicals, Inc. on behalf of Alzheimer's Association.
Déclaration de conflit d'intérêts
The authors have no conflicts of interest to declare.
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