A feeling of detachment from self and feeling of being an external observer of his body is suggestive of:
**Core Concept**
The question is testing the understanding of depersonalization disorder, a condition characterized by a feeling of detachment from oneself and the world around. This phenomenon is often associated with anxiety, stress, or trauma.
**Why the Correct Answer is Right**
Depersonalization disorder involves a disruption in the normal integration of sensory information, leading to a sense of detachment from one's own body and emotions. This can be attributed to the dysfunction of the default mode network (DMN) in the brain, which is responsible for self-referential processing and introspection. The DMN, composed of regions such as the medial prefrontal cortex (mPFC) and posterior cingulate cortex (PCC), is often impaired in individuals with depersonalization disorder.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option might refer to a dissociative fugue, a condition characterized by sudden travel away from home or work, with amnesia for one's past and identity. While both conditions involve dissociation, they are distinct and do not share the same underlying mechanisms.
* **Option B:** This option might refer to depresonalization in the context of schizophrenia, which is a distinct psychiatric disorder characterized by hallucinations, delusions, and disorganized thinking. While both conditions involve symptoms of detachment, the underlying causes and mechanisms are different.
* **Option C:** This option might refer to derealization, a condition characterized by a feeling of detachment from the external world, but not from oneself. While both conditions involve dissociation, they are distinct and do not overlap.
**Clinical Pearl / High-Yield Fact**
Depersonalization disorder often co-occurs with other psychiatric conditions, such as anxiety disorders and post-traumatic stress disorder (PTSD). A thorough evaluation of the patient's medical and psychiatric history is essential in making an accurate diagnosis.
**Correct Answer:** D. Depersonalization disorder.