1
|
Korkki SM, Papenberg G, Karalija N, Garrett DD, Riklund K, Lövdén M, Lindenberger U, Nyberg L, Bäckman L. Fronto-striatal dopamine D2 receptor availability is associated with cognitive variability in older individuals with low dopamine integrity. Sci Rep 2021; 11:21089. [PMID: 34702857 PMCID: PMC8548594 DOI: 10.1038/s41598-021-00106-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 09/30/2021] [Indexed: 11/09/2022] Open
Abstract
Within-person, moment-to-moment, variability in behavior increases with advancing adult age, potentially reflecting the influence of reduced structural and neurochemical brain integrity, especially that of the dopaminergic system. We examined the role of dopamine D2 receptor (D2DR) availability, grey-, and white-matter integrity, for between-person differences in cognitive variability in a large sample of healthy older adults (n = 181; 64-68 years) from the Cognition, Brain, and Aging (COBRA) study. Intra-individual variability (IIV) in cognition was measured as across-trial variability in participants' response times for tasks assessing perceptual speed and working memory, as well as for a control task of motor speed. Across the whole sample, no associations of D2DR availability, or grey- and white-matter integrity, to IIV were observed. However, within-person variability in cognition was increased in two subgroups of individuals displaying low mean-level cognitive performance, one of which was characterized by low subcortical and cortical D2DR availability. In this latter group, fronto-striatal D2DR availability correlated negatively with within-person variability in cognition. This finding suggests that the influence of D2DR availability on cognitive variability may be more easily disclosed among individuals with low dopamine-system integrity, highlighting the benefits of large-scale studies for delineating heterogeneity in brain-behavior associations in older age.
Collapse
Affiliation(s)
- Saana M. Korkki
- grid.10548.380000 0004 1936 9377Aging Research Center, Karolinska Institute and Stockholm University, Stockholm, Sweden
| | - Goran Papenberg
- grid.10548.380000 0004 1936 9377Aging Research Center, Karolinska Institute and Stockholm University, Stockholm, Sweden
| | - Nina Karalija
- grid.12650.300000 0001 1034 3451Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden
| | - Douglas D. Garrett
- grid.419526.d0000 0000 9859 7917Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany ,grid.4372.20000 0001 2105 1091Max Planck UCL Centre for Computational Psychiatry and Ageing Research, Berlin, Germany
| | - Katrine Riklund
- grid.12650.300000 0001 1034 3451Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden
| | - Martin Lövdén
- grid.8761.80000 0000 9919 9582Department of Psychology, University of Gothenburg, Gothenburg, Sweden
| | - Ulman Lindenberger
- grid.419526.d0000 0000 9859 7917Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany ,grid.4372.20000 0001 2105 1091Max Planck UCL Centre for Computational Psychiatry and Ageing Research, Berlin, Germany
| | - Lars Nyberg
- grid.12650.300000 0001 1034 3451Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Department of Integrative Medical Biology, Umeå University, Umeå, Sweden
| | - Lars Bäckman
- grid.10548.380000 0004 1936 9377Aging Research Center, Karolinska Institute and Stockholm University, Stockholm, Sweden
| |
Collapse
|