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Impaired Empathy Versus General Hypoemotionality in Frontotemporal Dementia
Mario F Mendez1, Andrew R Carr1, Elvira E Jimenez1
1The Departments of Neurology, Psychiatry and Biobehavioral Sciences, and Medicine, Statistic Core, David Geffen School of Medicine, University of California at Los Angeles (Mendez, Jimenez); the VA Greater Los Angeles Healthcare System (Mendez, Carr, Jimenez); the Imaging Genetics Center, Mark and Mary Stevens Neuroimaging and Informatics Institute, University of Southern California, Los Angeles (Riedel, Thompson); and the Departments of Engineering, Neurology, Ophthalmology, Pediatrics, Psychiatry, and Radiology, University of Southern California, Los Angeles (Thompson).
Behavioral variant frontotemporal dementia (bvFTD) patients show impaired empathic behavior and reduced physiological responses to emotional stimuli, suggesting a specific deficit in emotional empathy linked to the dorsal anterior cingulate gyrus.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Science
Background:
- Impaired empathy is a key feature of behavioral variant frontotemporal dementia (bvFTD).
- It remains unclear if this empathy deficit stems from a primary empathy impairment or general emotional blunting.
Purpose of the Study:
- To investigate whether bvFTD is associated with a primary deficit in empathy or general emotional blunting.
- To explore the neural correlates of empathy and emotional processing in bvFTD.
Main Methods:
- Assessed empathy (SDS) and emotional blunting (SEB) in patients with bvFTD (N=10) and Alzheimer's disease (N=15).
- Measured autonomic responses (skin conductance responses [SCR]) to emotional and empathy-specific stimuli (IAPS) in patient groups and healthy controls (N=18).
- Utilized MRI to correlate SCR with brain structure, specifically the dorsal anterior cingulate gyrus (dACC).
Main Results:
- bvFTD patients exhibited impaired empathic behavior on the SDS, independent of emotional blunting scores (SEB).
- Patients with bvFTD showed significantly reduced SCR to all stimuli, including empathy-evoking images, irrespective of emotional content.
- SCR levels correlated significantly with the volume of the dorsal anterior cingulate gyrus (dACC) across all participants.
Conclusions:
- bvFTD is characterized by decreased empathic behavior and reduced psychophysiological responses to empathy stimuli, even without general emotional blunting.
- These findings suggest a specific impairment in emotional empathy in bvFTD.
- The results point to a potential role for the dACC in the emotional appraisal deficits observed in bvFTD.
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