It's a similar thing to those old (and way unethical) '70s and older studies they used to do to schoolchildren. Various forms of psychological abuse (telling t

It's a similar thing to those old (and way unethical) '70s and older studies they used to do to schoolchildren. Various forms of psychological abuse (telling them they aren't doing well even if they are, grouping them and prodding one group to harass the other) can negatively affects academic performance.