Interpersonal neural synchronization underlies interactive concept learning in older adults.

Lifelong learning is essential for active aging, yet interactive learning remains underexplored in older adults. Using fNIRS-based hyperscanning, this study investigated instructor-learner neural interactions in older learners during a concept learning task. Study 1 compared passive and active learning approaches in younger and older learners, while Study 2 compared intergenerational (younger instructors) versus intragenerational (older instructors) learning among older learners, using the more effective approach from Study 1. Older adults performed better with passive learning (Study 1) and when taught by younger instructors (Study 2). Passive learning increased frontopolar interpersonal neural synchronization (INS), while intergenerational learning enhanced INS in both frontopolar and dorsolateral prefrontal regions. Intersubject representational similarity analysis (IS-RSA) showed that learners with similar performance exhibited greater neural similarity in the frontopolar cortex. These findings reveal the neural basis of interactive learning in aging and offer practical guidance for optimizing educational practices in older populations.