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Carr AR, Jimenez EE, Thompson PM, Mendez MF. Frontotemporal asymmetry in socioemotional behavior: A pilot study in frontotemporal dementia. Soc Neurosci 2019; 15:15-24. [PMID: 31064266 DOI: 10.1080/17470919.2019.1614478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Clinical studies report abnormal socioemotional behavior in patients with right frontotemporal disease, but neuroimaging studies of socioemotional behavior usually show bilateral activations in normal subjects. This discrepancy suggests that impaired interhemispheric collaboration for socioemotional functions results from asymmetric frontotemporal disease. Behavioral variant frontotemporal dementia (bvFTD) can clarify the contribution of direction-independent frontotemporal asymmetry. In a two-part study, we evaluated bvFTD patients using socioemotional scales and magnetic and resonance imaging measures. Part A compared 18 patients on scales of social dysfunction and emotional intelligence with degree of asymmetry in frontal lobe volumes and analyzed differences between lower and higher asymmetry groups. Part B compared 24 patients on scales of social observation and emotional blunting with degree of asymmetry in frontotemporal cortical thickness using multiple linear regression. Both results showed that left or right hemispheric-specific contributions did not account for all socioemotional differences and that frontal lobe and frontotemporal differences in atrophy between the hemispheres accounted for significant variance in abnormalities in social and emotional behavior. These preliminary results indicate that the degree of frontal lobe and frontotemporal asymmetric involvement, regardless of direction or laterality, significantly contribute to socioemotional dysfunction and support the hypothesis that interhemispheric collaboration is important for complex socioemotional behavior.
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Affiliation(s)
- Andrew R Carr
- Neurology Service, V.A. Greater Los Angeles Healthcare System, Los Angeles, CA, USA.,Departments of Neurology, University of California at Los Angeles, Los Angeles, CA, USA
| | - Elvira E Jimenez
- Neurology Service, V.A. Greater Los Angeles Healthcare System, Los Angeles, CA, USA.,Departments of Neurology, University of California at Los Angeles, Los Angeles, CA, USA
| | - Paul M Thompson
- Imaging Genetics Center, Mark & Mary Stevens Neuroimaging & Informatics Institute, University of Southern California, Marina del Rey, CA, USA
| | - Mario F Mendez
- Neurology Service, V.A. Greater Los Angeles Healthcare System, Los Angeles, CA, USA.,Departments of Neurology, University of California at Los Angeles, Los Angeles, CA, USA.,Psychiatry & Biobehavioral Sciences, and Medicine, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA, USA
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