A patient when asked about a paicular topic, stas speaking irrelevant details that is totally needed and finally reaches the goal. this type of formal thought disorder is called as
**Core Concept**
This question assesses the patient's thought disorder, specifically a formal thought disorder characterized by a deviation in the way thoughts are logically organized and expressed. This type of disorder is often observed in psychiatric conditions.
**Why the Correct Answer is Right**
The correct answer is a type of formal thought disorder known as **Tangentiality**. In tangentiality, the patient starts with a relevant topic but then diverts off into unrelated details, eventually returning to the original topic. This is thought to be a result of the patient's difficulty in maintaining a logical flow of thoughts and ideas. The underlying mechanism may involve impaired executive function, particularly in the prefrontal cortex, which is responsible for planning, decision-making, and regulating cognitive processes.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it describes a different type of thought disorder. **Loosening of associations** is a formal thought disorder characterized by a disorganized and fragmented flow of thoughts, but it does not necessarily involve the patient eventually returning to the original topic.
* **Option B:** This option is incorrect because it describes a type of disorganized thinking, but it is not a specific formal thought disorder. **Disorganized thinking** is a broader term that encompasses various types of thought disorders, including tangentiality.
* **Option C:** This option is incorrect because it describes a type of thought disorder known as **Circumstantiality**. In circumstantiality, the patient provides excessive and irrelevant details before finally reaching the main point, but the flow of thoughts is more coherent than in tangentiality.
**Clinical Pearl / High-Yield Fact**
To remember the difference between tangentiality and circumstantiality, think of the former as a "detour" and the latter as a "roadmap with too many stops."
**Correct Answer: C. Circumstantiality is incorrect. The correct answer is actually a different option: D. Tangentiality.