perseveration

This term is primarily used in clinical, neuropsychological, and psychiatric contexts to describe a dysfunction of executive control. It differs from "perseverance," which is a positive trait involving persistence and determination. Perseveration is characterized by an inability to shift mental sets, resulting in a repetitive loop that is involuntary and often distressing to the individual.

In a non-clinical sense, the word describes a psychological "stuckness," where a person cannot stop ruminating on a specific detail or mistake. While it shares similarities with obsession, perseveration specifically emphasizes the repetitive nature of the response or thought pattern regardless of the changing environment or context.