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UPPSC 2023
Applied Psychology
Easy

Perceiving a rope as a snake in a dark room is an example of -

Appeared in: UPPSC 2023

Explanation

  • An illusion is defined as a misinterpretation or misperception of a real sensory stimulus.
  • In the given scenario, a real object (the rope) is present in the environment.
  • The brain misinterprets this real stimulus as something else (a snake), which fits the classic definition of an illusion.
  • Factors like dim lighting, fatigue, or fear can contribute to the occurrence of illusions.

Why Other Options Were Wrong

  • Option A: Retinal disparity is a normal physiological process related to binocular vision for perceiving depth and distance.
  • Option B: A perceptual set is a psychological predisposition or expectation. While it can influence an illusion (e.g., expecting to see a snake makes it more likely), it is not the perceptual error itself.
  • Option C: A hallucination is a sensory perception that occurs in the complete absence of any real, external stimulus.

Related Visual

Visual explanation — Related Visual
Clinical Relevance
  • Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Perceptual Disturbances: Illusion vs. Hallucination as background academic context rather than a clinical decision trigger.
  • Nurses must accurately differentiate between illusions, hallucinations, and delusions as they are key indicators of a patient's mental status and can point to different underlying conditions (e.g., delirium, psychosis, substance withdrawal, or neurological disorders).
  • Documenting the specific nature of a perceptual disturbance is critical for diagnosis and treatment planning. Describing an illusion (e.g., 'patient mistook IV tubing for a snake') is very different from a hallucination (e.g., 'patient sees snakes on a blank wall').
  • What if? If the patient saw a snake in a well-lit, empty room, the assessment would shift from a likely illusion to a probable hallucination. This would warrant a more urgent investigation for psychosis, delirium, or severe substance withdrawal, rather than simply reassuring the patient about a misinterpreted object.
How to Approach the Question
  • First, analyze the key components of the question's scenario: there is a real object ('rope'), a specific condition ('dark room'), and a misinterpretation ('perceived as a snake').
  • The core task is to classify this perceptual event. Recall the definitions of the key terms related to perceptual disturbances.
  • Evaluate the options based on the scenario: Does the event involve a real stimulus? Yes, the rope. This immediately makes 'hallucination' (which requires no stimulus) an unlikely answer.
  • Consider the remaining options. The event is a direct misinterpretation of the stimulus. This perfectly matches the definition of an 'illusion'.
  • 'Perceptual set' is a predisposition, not the event itself. 'Retinal disparity' is about depth perception, which is irrelevant here.
  • Therefore, 'illusion' is the most accurate and specific term for the described event.
Concept Tested & Keywords
  • Concept Tested: Perceptual Disturbances: Illusion vs. Hallucination
  • Stem keywords: perceiving, rope as a snake, dark room
  • Lead-in keywords: is an example of
  • Negative lead-in flag: false

Question ID

QSSXHrZe7xWNWcr-JCxVAx

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) p. 3815-3817

E6 Psychology Baron Misra 5e Part 1 p. 140-142

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