Plasticity Has a Dark Side

The same rewiring that helps you can hurt you. Chronic pain can train the nervous system to keep firing pain signals long after the injury heals. Addiction carves reward pathways so deep that a cue can spark cravings years after the last use. Even rumination counts: every anxious spiral makes the next one easier to trigger.

The upside is that learned patterns can be unlearned. Cognitive behavioral therapy uses this directly, having people rehearse new responses until the practice physically reshapes anxiety and depression circuits.