The belief that stress enhances performance can lead to approximately equivalent improvements in performance compared to the detriment caused by the belief that stress limits performance.

“you take a different group of people and randomly assign them to another group where now they're being told that stress enhances performance it mobilizes resources it Narrows your vision such that you can perform tasks better Etc et cetera and their performance increases above a control group that receives just useless information or at least useless as it relates to the task”