Question:

Which of the following is included in form of thought disorder?

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Distinguish between the form (structure/flow) and content (subject matter) of thought -- only one option is a disturbance of form.
Updated On: Jun 23, 2026
  • Derailment
  • Obsession
  • Thought insertion
  • Delusion
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The Correct Option is A

Solution and Explanation

Step 1: Understand the classification of thought disorders.
Thought disorders are broadly classified into two categories:
  • Form of thought (Formal thought disorder): Abnormalities in the structure, organisation, and linkage of thoughts. These relate to how a person thinks.
  • Content of thought: Abnormalities in what a person thinks about (e.g., delusions, obsessions, phobias, overvalued ideas).
Step 2: Classify each option.
  • Derailment (loosening of associations): The train of thought shifts from one topic to another with no logical connection. This is a formal thought disorder -- a disturbance in the form of thought.
  • Obsession: A recurrent, intrusive thought that the person recognises as their own but cannot suppress. This is a content of thought abnormality.
  • Thought insertion: The belief that thoughts are being placed into one's mind by an external force. This is a content of thought abnormality (a Schneiderian first-rank symptom).
  • Delusion: A fixed, false, unshakeable belief not in keeping with cultural norms. This is a content of thought abnormality.
Step 3: Identify the correct answer.
Other examples of formal (form of) thought disorders include: pressured speech, poverty of speech, tangentiality, verbigeration, and thought blocking. Derailment belongs squarely in this category. The correct answer is A. Derailment.
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