Addiction arises from an imbalance between bottom-up reward-learning processes and top-down executive control in the brain, with drug use weakening prefrontal cognitive control networks and hijacking striatal circuits meant for natural rewards. Mindfulness-based interventions (MBIs) can be seen as mental training that exercises and strengthens these brain networks. This review proposes that MBIs remediate addiction by regulating frontostriatal circuits, restoring balance between top-down and bottom-up processes. Evidence indicates MBIs improve cognitive control over drug-related automaticity, attentional bias, and cue reactivity, while increasing responsiveness to natural rewards. An integrative account of neural mechanisms is offered to inform addiction therapy.
Focused attention meditation (FA) involves concentrating on a specific object, like the breath, while letting go of distractions. This scoping systematic review examined EEG and MEG studies on FA to clarify how these studies are designed and what they found about brain activity. The review found that participant characteristics varied widely across studies, which may explain inconsistent results, while the types of meditation tasks and control conditions used were fairly similar. Consistent neurophysiological trends show that FA is linked to increased brainwave power in alpha, beta, and gamma bands, along with higher neural complexity and reduced criticality. The review recommends methodological improvements and notes gaps, such as limited MEG use and a lack of longitudinal studies.
The paper argues that the term 'plasticity' in neuroscience refers to induced changes in brain function or structure, which differs from the dictionary definition of plasticity as the ability to be shaped or molded. Many biomarkers of neuroplasticity actually index processes that bias phenotypic canalization, the opposite of phenotypic plasticity, creating a paradox. The authors question extrapolating from these biomarkers to improved mental health, as the relationship is context dependent. They propose a new construct, 'mediational and recalibrative plasticity' (MR-P), which aligns with plasticity proper and can describe and predict phenotypic changes relevant to mental health.
Psychedelic compounds alter gene expression in the brain, and this study maps those changes across species. The gene activity patterns linked to psychedelic action are associated with the 5HT2A receptor, specific cortical layers of the brain, and human accelerated regions—genetic sequences that evolved rapidly in humans and are thought to be important for brain evolution. These findings suggest that psychedelic-induced gene expression may tap into evolutionarily recent and layer-specific brain circuitry.