Perception without stimulus is called as?

Appeared in: AIIMS Bhuvneshwar NO- 2018

Explanation

A hallucination is defined as a sensory perception that occurs in the complete absence of any corresponding external stimulus.
This phenomenon can affect any of the five senses: auditory (hearing), visual (seeing), tactile (touching), olfactory (smelling), or gustatory (tasting).
The question describes a 'perception without stimulus,' which is the textbook definition of a hallucination.
Auditory hallucinations are the most common type in psychiatric conditions like schizophrenia.

Why Other Options Were Wrong

Option A: Delirium is a disorder of consciousness and cognition, characterized by an acute and fluctuating state of confusion. While a person with delirium may experience hallucinations, delirium itself is the overall syndrome, not the specific perceptual error.
Option C: A delusion is a disorder of thought content, not perception. It is a fixed, false belief that is firmly held despite evidence to the contrary.
Option D: An illusion is a misinterpretation or distortion of a real external stimulus. It requires a stimulus to be present, which is then perceived incorrectly.

Related Visual

A comparison chart showing the difference between Hallucination a person hearing voices from an empty room, Illusion a person seeing a monster in a coat rack, and Delusion ...

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.
Distinguishing between hallucinations, illusions, and delusions is a fundamental skill in mental health nursing, as it directly impacts the diagnostic process and care planning.
A priority nursing assessment for a patient experiencing hallucinations is to check for 'command hallucinations' (voices telling the person to do something), as these can pose a significant risk of harm to self or others.
The nurse's response should be therapeutic; avoid reinforcing the hallucination but also avoid arguing or dismissing the patient's experience. Acknowledging the patient's feeling (e.g., fear) is key.

How to Approach the Question

This is a recall-based question that tests your knowledge of fundamental psychiatric definitions.
Identify the core components of the question: 'perception' and 'without stimulus'.
Systematically evaluate each option against this definition.
Recall that a 'hallucination' is a perception with no stimulus.
Recall that an 'illusion' is a perception with a misinterpreted stimulus.
Recall that a 'delusion' is a false belief, a disorder of thought, not perception.

Concept Tested & Keywords

Concept Tested: Disorders of Perception and Thought
Stem keywords: Perception, stimulus
Lead-in keywords: is called as
Negative lead-in flag: false

Question ID

QdTRMbtzXhI7SRph1LdRqw

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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