When being in a group improves the performance of individual members of that group, is said to have occurred.

social facilitation

Explanation:

The improvement of the performance of group members rather than working alone is social facilitation. It is hypothesized that having someone that is observing a person while working motivates them.

However, the person performing a task must be competent at the task they are performing. A person who is not competent at the task shows a degradation of performance.

Hence, the statement here is referring to social facilitation.

answer; conditional stimulus will trigger a conditioned response;

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