Why have brain scan studies been criticized?

Brain scans offer us a rare sight: a look into the mind and its mysteries. They promise answers to many questions. How do we feel pain? How do we know a face? How do we move our body? But can brain scans really answer these questions? Many scientists are now rethinking the value of brain scan research and whether its findings are true. Brain scan studies have been criticized for several things-Criticisms include using too few subjects and incorrecdy reading results.