A perception that occurs when a sensory stimulus is present but is incorrectly perceived and misinterpreted is known as?

Appeared in: GMCH Chandigarh - 2019

Explanation

An illusion is defined as a misinterpretation or misperception of a real external sensory stimulus.
The question stem perfectly matches this definition by stating a 'sensory stimulus is present' but is 'incorrectly perceived and misinterpreted'.
A common example is mistaking shadows on a wall for a threatening figure in a dimly lit room; the shadows (stimulus) are real, but the interpretation (threatening figure) is incorrect.

Why Other Options Were Wrong

Option A: A hallucination is a sensory perception that occurs in the complete absence of an external stimulus. The question specifies that a stimulus is present.
Option B: A delusion is a disorder of thought content, not perception. It is a false, fixed belief that is held firmly despite contradictory evidence. It does not involve misinterpreting a sensory stimulus.
Option D: A neologism is a disorder of thought process, specifically related to speech. It is the creation of a new word that has meaning only to the person using it. It is not a perceptual disturbance.

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 and Thought as background academic context rather than a clinical decision trigger.
Accurately identifying and documenting perceptual disturbances is a fundamental nursing skill in mental health. It is critical for diagnosis, risk assessment, and planning care.
For a patient experiencing illusions, nursing interventions focus on reorientation and environmental modification, such as ensuring adequate lighting and reducing clutter.
For a patient with hallucinations, the priority is safety. The nurse must assess for command hallucinations (voices telling the patient to harm themselves or others) and implement safety protocols.

How to Approach the Question

First, break down the question stem. The key phrases are 'sensory stimulus is present' and 'incorrectly perceived'.
This immediately tells you the problem is about misinterpreting something that is real.
Next, evaluate the options based on their core definitions.
Hallucination: No stimulus. This contradicts the stem.
Delusion: A belief, not a perception. This is a different category of symptom.
Neologism: A made-up word, a speech issue. This is also not a perceptual issue.

Concept Tested & Keywords

Concept Tested: Disorders of Perception and Thought
Stem keywords: perception, sensory stimulus, incorrectly perceived, misinterpreted
Lead-in keywords: known as

Question ID

Qvl17DBA2rY_mNOsmEOxJd

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, 3251-3253, 3250-3252

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