Dopaminergic Mechanisms in Cognitive Aging
Summary
Dopaminergic signalling underpins a host of cognitive operations that commonly decline with advancing age, including working memory, processing speed and executive control. Age‐related reductions in dopamine synthesis, release and receptor availability alter the fine‐tuned balance of neuromodulation across striatal and cortical networks. In early adulthood, excessive dopamine receptor stimulation may confer both benefits and vulnerabilities, whereas in later decades insufficient receptor density and impaired neurotransmitter turnover contribute to slowed cognitive processing and greater heterogeneity of performance. Declines in D1-like receptors, particularly within associative striatum and prefrontal cortex, impair the dynamic tuning of neuronal assemblies required for flexible updating of working memory, while losses in D2-like receptor populations, notably in putamen and nucleus accumbens, compromise reward‐related learning and memory consolidation. These changes intersect with regional white matter deterioration and cerebrovascular alterations, further undermining network integrity. Contemporary models posit an inverted U-shaped relationship between receptor availability and cognitive output, whereby intermediate dopamine signalling optimises functional connectivity among frontoparietal, default mode and salience networks. Understanding the trajectories and individual differences in dopaminergic decline is critical for identifying biomarkers of healthy ageing and for developing interventions aimed at restoring neuromodulatory balance, whether through pharmacological agents, lifestyle modifications or targeted cognitive training.
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Dopaminergic Mechanisms in Cognitive Aging publication trend
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Technical terms
Dopamine: A neuromodulatory neurotransmitter that regulates motivation, reward processing and executive functions.
D1-like receptors: G-protein-coupled dopamine receptors (including D1 and D5 subtypes) that enhance excitatory signalling in neuronal circuits.
D2-like receptors: Dopamine receptor subtypes (including D2, D3 and D4) associated with inhibitory modulation of synaptic transmission.
Functional connectivity: Statistical dependence between activity in distinct brain regions, reflecting coordinated network dynamics.
Positron emission tomography (PET): An imaging technique that uses radiolabelled tracers to quantify receptor availability or neurotransmitter turnover in vivo.
Inverted U-shaped relationship: A model describing optimal cognitive performance at intermediate levels of neuromodulator receptor availability, with impairment at both low and high extremes.
References
- Biphasic patterns of age-related differences in dopamine D1 receptors across the adult lifespan. Cell Reports (2023).
- Longitudinal support for the correlative triad among aging, dopamine D2-like receptor loss, and memory decline. Neurobiology of Aging (2024).
- DyNAMiC: A prospective longitudinal study of dopamine and brain connectomes: A new window into cognitive aging. Journal of Neuroscience Research (2022).
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