One of the following is a disorder of perception :

Appeared in: IGNOU PB. Bsc. Nsg. Entrance-2025

Explanation

An illusion is a disorder of perception characterized by the misinterpretation of a real external stimulus.
Perception is the cognitive process of interpreting sensory information to understand the environment.
A classic example of an illusion is mistaking shadows on a wall for a threatening figure in a dark room; the stimulus (shadows) is real but is perceived incorrectly.
Unlike hallucinations, illusions require an actual external stimulus to be present.

Why Other Options Were Wrong

Option B: Cataplexy is a motor disorder, not a perceptual one. It affects muscle control.
Option C: A delusion is a disorder of thought content, involving false beliefs, not a misinterpretation of sensory input.
Option D: Perseveration is a disorder of the thought process or speech, characterized by repetition, not a disorder of sensory perception.

Related Visual

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of Psychiatric Disorders: Perception vs. Thought as background academic context rather than a clinical decision trigger.
Accurately identifying and differentiating between disorders of perception, thought, and motor function is a fundamental nursing skill in psychiatric assessment. It directly impacts the accuracy of diagnosis and the effectiveness of the care plan.
A nurse's detailed documentation of a patient's specific symptoms (e.g., describing an illusion vs. a delusion) provides critical information to the healthcare team for treatment planning and risk assessment.
What if? - If the patient saw a snake when there was nothing in the room, it would be a hallucination, not an illusion. A hallucination is a false perception in the absence of any real external stimulus and often indicates a more severe level of psychosis, requiring different and often more urgent interventions.

How to Approach the Question

First, identify the core concept in the question stem, which is 'disorder of perception'.
Recall or define 'perception'. It is the process of organizing and interpreting sensory information from the environment.
Evaluate each option against this definition.
Analyze 'Illusion': This is a misinterpretation of a real sensory stimulus. This directly relates to the process of perception.
Analyze 'Cataplexy': This involves a sudden loss of muscle tone, which is a motor function, not a sensory or perceptual one.
Analyze 'Delusion': This is a false, fixed belief, which is a disturbance in thought content, not perception.

Concept Tested & Keywords

Concept Tested: Classification of Psychiatric Disorders: Perception vs. Thought
Stem keywords: disorder of perception
Lead-in keywords: BEST, MOST RELEVANT CLUE
Negative lead-in flag: false

Question ID

Qw-oOz977RpSB7LlWUTYL9

Reference Book

E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) pp. 3815-3817, 3814-3816, 3251-3253

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