An 18-month randomized trial of meditation training versus non-native language training or no intervention in cognitively unimpaired adults aged 65 and older found no significant changes in brain volume or perfusion of the anterior cingulate cortex or insula from meditation. Meditation did produce superior improvements in a composite score of attention regulation, socioemotional capacities, and self-knowledge compared with language training. The findings confirm the feasibility of both meditation and language training in older adults, with high adherence and low dropout, but the positive behavioral effects of meditation were not accompanied by measurable changes in the targeted brain structures.
A theory-based classification of meditation practices—attentional, constructive, and deconstructive—can guide the creation of composite scores from existing psychological questionnaires. In three samples (meditation-naïve older adults, meditation-naïve older adults with subjective cognitive decline, and long-term meditators with at least 10,000 hours of practice), these composite scores showed adequate psychometric properties, including low floor and ceiling effects, interpretability, and convergent validity with well-being, anxiety, and depression measures. Confirmatory factor analyses supported the predicted three-factor structure. The findings suggest that theoretical models of meditation mechanisms can yield empirically meaningful composite scores for research.