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Prosopagnosia

Prosopagnosia

Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...

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Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking

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Semantic processing in subjective cognitive decline: An eye-tracking study.

Marc-Antoine Akzam-Ouellette¹, Isabelle Rouleau¹, Laura Monetta²

¹Centre de Recherche de l'Institut Universitaire de Geriatrie de Montreal.

Neuropsychology

|September 11, 2025

Summary

This summary is machine-generated.

Individuals with subjective cognitive decline (SCD) show weakened semantic processing, treating famous and unfamiliar faces similarly. This suggests potential early detection of Alzheimer's disease cognitive decline.

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Area of Science:

Neuroscience
Cognitive Psychology
Gerontology

Background:

Alzheimer's disease preclinical stage involves subjective cognitive decline (SCD) with normal cognitive tests.
Subtle semantic processing difficulties are emerging as a key characteristic of SCD.
Investigating cognitive processing in SCD is crucial for early Alzheimer's detection.

Purpose of the Study:

To examine cognitive processing of famous versus unfamiliar faces in individuals with SCD.
To assess semantic memory deficits in the preclinical stage of Alzheimer's disease.
To compare eye movement patterns between SCD participants and healthy controls.

Main Methods:

Eye movements of 27 SCD participants and 26 controls were recorded during a face judgment task.
Analysis focused on mean fixation times, number of revisitations, and number of fixations.
Stimuli included both famous and unfamiliar faces to probe semantic memory.

Main Results:

The SCD group did not show differential processing patterns between famous and unfamiliar faces.
Control participants exhibited distinct processing patterns for famous versus unfamiliar faces.
No significant differences in fixation times or revisitations were found between face types in the SCD group.

Conclusions:

Individuals with SCD may exhibit impaired semantic processing, evidenced by similar processing of famous and unfamiliar faces.
This finding indicates a potential weakening of semantic memory in the early stages of Alzheimer's disease.
The results highlight the potential for eye-tracking tasks to aid in the early detection of cognitive decline.