Which term describes the repetitive expression of a single idea in response to different questions?

The correct term for the repetitive expression of a single idea in response to different questions is preservation. This phenomenon is often observed in individuals with certain mental health conditions, particularly those affecting thought processes, such as schizophrenia or other cognitive impairments. Preservation involves the fixation on a particular thought or phrase, leading a person to reiterate it despite the context or relevance to the current conversation.

This behavior can disrupt normal communication, as the individual may seem unable to shift their focus from the repeated idea, indicating a cognitive rigidity. Understanding preservation is crucial in mental health care, as it highlights the need for tailored communication strategies with affected individuals to facilitate better interaction and support their understanding.

While thought blocking refers to an interruption in a person's thought process, tangential thinking involves providing responses that stray from the original topic, and projection relates to attributing one’s own feelings or thoughts onto others, none of these describe the repetitive nature of preservation.