How Much Do Positive or Negative Expectations Affect Performance?

The Bulletproof Musician

Even from a very early age, I remember being told to imagine things going well. The idea, was that if I could imagine a positive outcome, I'd be more likely to expect good things, which would help me perform better.
Is this just something that people say? Or do our expectations really have a meaningful effect on how we perform?
A classic 1972 study illustrates the effect that positive or negative expectations can have on performance.
Get all the nerdy details here:
How Much Do Positive or Negative Expectations Affect Performance?

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