The real story of how our brains and nervous systems change throughout our lifetimes-with or without “brain training.”Fifty years ago, neuroscientists thought that a mature brain was fixed like a fly in amber, unable to change. Today, we know that our brains and nervous systems change throughout our lifetimes. This concept of neuroplasticity has captured the imagination of a public eager for self-improvement-and has inspired countless Internet entrepreneurs who peddle dubious “brain training” games and apps.