Ashley sang and danced perfectly while rehearsing by herself for her concert. when it was time for her to actually perform in front of a large audience, ashley forgot some of her lyrics and dance steps. this is an example of

Social facilitation

Explanation:

Social facilitation refers to how one's performance can be improved by the surrounding people .However depending on the situation social inhibition can also result from this.

Social facilitation is divided into : co-action effects and audience effect.

Co- action effect exist when someone perform surrounded with others doing the same task or project which increases their performance, such as studying in a study group or at the library where everyone is studying.

Audience effect is when one's performance is affected by the presence of the audience , for someone else audience may improve their performance for some it may inhibit it depending on how one prepared themselves or for the fact that some people can not perform well in the front of the audience cause it may bring anxiety eventhough they do well when they practice alone like Ashley.