Scientists have -- for the first time -- documented the formation of a newly learned concept inside the brain and show that it occurs in the same brain areas for everyone. The results from this study also indicate that it may be possible to use a similar approach to understand the 'loss' of knowledge in various brain disorders, such as dementia or Alzheimer's disease, or due to brain injuries. The loss of a concept in the brain may be the reverse of the process that the study observed.