Social brain
How Dementia Types Differ in Reading Faces and Minds
Open access · cc by · source: Europe PMC
Different forms of frontotemporal dementia experience social thinking deficits due to different underlying brain damage patterns.
How this study connects
Role on claims
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Neurodegenerative diseases such as frontotemporal dementia variants impair key social cognitive skills, including emotion recognition and mental state inference, through distinct structural atrophy patterns across localized cortical networks.
Evidence for the claim as stated.
Structural neuroimaging can map distinct patterns of regional brain atrophy to explain why different dementia subtypes experience distinct cognitive and social deficits, such as linking orbitofrontal atrophy to behavioral variant frontotemporal dementia and temporal pole atrophy to progressive non-fluent aphasia.
Evidence for the claim as stated.
Study at a glance
- Design
- Case-control — Social-cognition tests plus VBM atrophy maps in bvFTD vs PNFA vs controls
- N
- N=34 · 12 bvFTD, 10 PNFA, and 12 age/education-matched controls with structural MRI (additional behavioral controls not all scanned)
- Population
- Patients in early-stage behavioral-variant FTD or progressive non-fluent aphasia and matched healthy controls
- Outcome
- Face, emotion, and theory-of-mind scores related to regional grey-matter atrophy
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How Dementia Types Differ in Reading Faces and Minds
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12 patients with behavioral variant frontotemporal dementia
We recruited 22 patients who fulfilled criteria for diagnoses of behavioral variant of FTD ( n = 12, 45% male; mean age = 69.81, SD = 7.35; mean years of education = 16, SD = 6.51) and PNFA ( n = 10, 55% male; mean age = 64.9, SD = 8.68; mean years of education = 12.3, SD = 4.49).
12 healthy controls scanned with structural MRI
A second group of 12 healthy controls, age (mean, 60.63; SD , 4.59) and education (mean, 15.5; SD , 3.13) matched were scanned with a structural MRI to be compared with patients (See Table ).
Key findings
Patients with behavioral variant frontotemporal dementia had intact face recognition but impaired emotion recognition and mental state inference, which correlated with atrophy in frontal regions like the orbitofrontal cortex and gyrus rectus. Conversely, progressive non-fluent aphasia patients showed deficits across each of the social tasks, with their difficulties linked to atrophy in the temporal pole and insula. This suggests that while both groups struggle with understanding others, their difficulties stem from different brain networks.
Methodology
Researchers compared 12 patients with behavioral variant frontotemporal dementia and 10 patients with progressive non-fluent aphasia to healthy control groups. They administered tests evaluating facial identity recognition, basic emotion identification, and the ability to infer mental states from pictures of eyes. Additionally, structural brain scans were performed on all patients and 12 of the healthy controls to identify brain atrophy associated with performance on these tasks.
Limitations
The study relies on a relatively small sample size, which increases the risk of spurious correlations and limits the generalizability of the findings. Because this is a correlational, cross-sectional design, it cannot prove a direct causal relationship between specific brain tissue loss and behavioral deficits. Additionally, the researchers used different control groups for the behavioral tests and the brain scans, meaning the baseline comparisons are indirect. Finally, the study cannot rule out whether other cognitive declines, such as language and executive functioning deficits, also influenced the social cognition scores.
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