Joanne is 70 years old and is about to take an iq test. she is worried because she knows that older people are assumed to have diminished mental abilities. joanne is being affected by

Joanne is being affected by Stereotype threat
Stereotype threat is a phenomenon when someone fears that they may realize/conform to the stereotype that exists about their social group.
In most cases, individuals who experience stereotype threat often come from the social group with negative stereotypes