Anosognosia and Theory of Mind Deficits Independently Associated with Caregiver Distress in Dementia

This cross-sectional secondary analysis examined the relationship between patient neuropsychiatric features and caregiver distress in dementia. The study included 205 research participants: 57 with Alzheimer’s disease, 38 with behavioral variant frontotemporal dementia, 12 with non-fluent primary progressive aphasia, 24 with semantic variant primary progressive aphasia, 18 with progressive supranuclear palsy syndrome, 14 with corticobasal syndrome, and 42 cognitively normal controls. The mean age was 64.2 years.

The study measured anosognosia (patient overestimation of function) using the Patient Competency Rating Scale and theory of mind deficits using The Awareness of Social Inference Test: Social Inference-Enriched. Caregiver distress was measured using the Neuropsychiatric Inventory Questionnaire Total Distress score. Both anosognosia and theory of mind deficits were significantly more common in all dementia syndromes compared to cognitively normal controls.

The main finding was that anosognosia and theory of mind deficits each independently predicted caregiver distress and had an additive effect (p < 0.001). The study did not report effect sizes, absolute numbers, or safety/tolerability data for these associations.

Key limitations include the cross-sectional design, which cannot establish causation, and the secondary analysis of an existing dataset. The study did not report effect sizes or absolute numbers for the main findings, limiting quantitative interpretation. This research suggests clinicians should be aware of these patient factors when assessing caregiver burden, but the evidence remains observational.