An acute and considerable decrease in skill execution and performance when self-expected standards are normally achievable, which is the result of increased anxiety under perceived pressure
Instructions directing participants to attend to aspects of skilled performance outside of conscious awareness of skilled performers should impair expert performance more than novice performance.
ACT distinguishes between two variables: Performance effectiveness (quality of performance) and Processing efficiency (the r/ship between performance effectiveness and the resources used to achieve that performance level)
Its reduced by task irrelevant thoughts (worries, performance concerns)
The prediction is that anxiety impairs processing efficiency more than performance effectiveness