A person, seeing a design on the wallpaper perceives it as an animal. This is an example of?

Appeared in: NIMHANS Nursing Officer - 2019

Explanation

An illusion is defined as a misinterpretation of a real, external sensory stimulus.
In the given scenario, the 'design on the wallpaper' is the real external stimulus.
The person's brain misinterprets this real pattern and perceives it as 'an animal'.
This perfectly matches the clinical definition of an illusion.

Why Other Options Were Wrong

Option A: A hallucination is a sensory perception that occurs in the complete absence of any real external stimulus. This is incorrect because a real stimulus (the wallpaper) is present.
Option B: A delusion is a disorder of thought content, specifically a false, fixed belief that is not based in reality and cannot be corrected by reason. The question describes a perceptual error, not a belief system.
Option D: An idea of reference is a type of delusion where a person believes that neutral, unrelated events or objects have a special, personal meaning. It is a disorder of thought, not a misperception of a physical object.

Related Visual

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Disorders of Perception as background academic context rather than a clinical decision trigger.
Differentiating between illusions, hallucinations, and delusions is a fundamental nursing skill in mental health assessment, as it points towards different underlying conditions.
Illusions are common in delirium, whereas hallucinations and delusions are hallmark symptoms of psychosis (e.g., in schizophrenia or severe mood disorders).
Nursing interventions for a patient experiencing illusions include providing adequate lighting, reducing clutter, offering reassurance, and reorienting the patient to reality (e.g., 'I know it looks like an animal, but it is the pattern on the wallpaper.').

How to Approach the Question

First, analyze the stem to identify the core components of the experience described.
Identify if a real, external stimulus is present. Here, the 'design on the wallpaper' is a real stimulus.
Determine what is happening to that stimulus. It is being misinterpreted or misperceived as 'an animal'.
Recall the definitions of the options. A misperception of a real stimulus is the definition of an illusion.
Rule out other options. A hallucination requires no stimulus. A delusion is a false belief, not a perception. An idea of reference is a specific type of false belief about personal significance.
Therefore, the scenario is a classic example of an illusion.

Concept Tested & Keywords

Concept Tested: Disorders of Perception
Stem keywords: design on the wallpaper, perceives it as an animal
Lead-in keywords: example of

Question ID

QvYhl1aKV5qfQhNJSU2KKx

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, 3250-3252

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