People experience a mood shift when they switch from taking short, shuffling steps to taking long strides and swinging their arms by their sides. This best illustrates

the behavior feedback effect

the behavior feedback effect.

Explanation:

Behavior feedback effect: In psychology, the term behavior feedback effect is defined as the propensity of a particular behavior to hinder or influence the other person's and ones' actions, thoughts, and feelings.

Behavior feedback effect has been widely used by psychologists during therapy sessions to notice the reactions of the clients.

In the question above, the given statement signifies the behavior feedback effect.