Attentional capture by incongruent object/background scenes in patients with Alzheimer disease

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
Quentin LenobleMuriel Boucart

Abstract

Object/background association is critical to understand the context of visual scenes but also in daily life tasks like object search. Patients with Alzheimer disease (AD) exhibit impairment in scene processing at different levels: perception, recognition, memory and spatial navigation. We explored whether patients with AD make use of contextual information in congruent and incongruent target/background conditions in three different saccadic choice tasks. We recruited 36 participants (12 young, 12 patients with AD at a moderate stage and 12 age-matched controls). Pairs of scenes (one congruent and one incongruent object/background) were displayed. In a free viewing task we recorded whether the participants spontaneously direct their gaze (eye tracker recordings) toward the congruent or the incongruent scene. In a task referred as "implicit", the participants had to saccade toward a pre-defined target (animal or piece of furniture) in a scene (congruent or not with the target). In a task, called "explicit", participants had to saccade towards the congruent scene. In contrast with both young and older controls patients with AD showed difficulties to refrain a first saccade toward incongruent scenes in the free viewing and the impl...Continue Reading

Citations

Aug 24, 2021·Brain Communications·Elia BenhamouJason D Warren
Nov 16, 2021·Seminars in Ophthalmology·Gemma Almario, David P Piñero

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