A patient may report hearing voices criticizing him every time he hears the sound of a rotating fan and it stops when the fan is not running. Which type of hallucination is described here?

1. A

   Functional hallucination

2. B

   Pseudo hallucination

3. C

   Visual hallucination

4. D

   Olfactory hallucination

Appeared in: NORCET 2 -2021 (Shift-2)

Explanation

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• A functional hallucination occurs when a real external stimulus triggers a hallucination, and both are perceived in the same sensory modality.
• The key characteristic is that the hallucination is dependent on the presence of the stimulus; it begins when the stimulus starts and ends when it stops.
• In this scenario, the auditory stimulus of the fan sound triggers the auditory hallucination of voices, fitting the classic definition of a functional hallucination.

Why Other Options Were Wrong

• Option B: Pseudo hallucination is defined by the patient's insight and awareness that the perception is not real. The question focuses on the trigger mechanism, not the patient's belief about the voices.
• Option C: Visual hallucinations involve the sense of sight. The patient in the scenario is experiencing an auditory phenomenon (hearing voices).
• Option D: Olfactory hallucinations involve the sense of smell. The patient's experience is auditory.

Related Visual

• Visual 1: Flowchart: A diagram illustrating the classification of perceptual disturbances, starting with 'Perceptual Disturbance' and branching into 'Illusion' and 'Hallucination', with further sub-branches for different types of hallucinations (e.g., by modality, functional, reflex).

Clinical Relevance

• Nursing practice connection: Use the key finding related to Classification of Hallucinations to guide bedside assessment, documentation, and the next nursing action.
• Accurately identifying and documenting the specific type of hallucination is a critical nursing skill. It provides valuable data for the psychiatric team to make an accurate diagnosis (e.g., schizophrenia, organic mental disorders) and formulate an effective treatment plan.
• Nurses should document the content, modality, trigger, timing, and the patient's emotional response to the hallucinations. This detailed information helps in assessing risk, especially with command hallucinations.
• What if the patient reported that the sound of the fan sounded like whispering voices? This would be an illusion—a misinterpretation of a real stimulus—rather than a functional hallucination, where a new, separate perception is added.

How to Approach the Question

• First, identify the core sensory experience described in the question. Here, the patient is 'hearing voices,' which points to an auditory phenomenon.
• Next, analyze the conditions under which this experience occurs. It happens only when a specific external stimulus ('sound of a rotating fan') is present.
• Note the relationship between the stimulus and the experience. The stimulus (sound) and the hallucination (voices) are in the same sensory modality (auditory) and occur simultaneously.
• Evaluate the given options against this analysis. 'Functional hallucination' is defined as a hallucination triggered by a real stimulus in the same modality.
• Eliminate the other options. 'Visual' and 'olfactory' refer to the wrong sensory modalities. 'Pseudo hallucination' refers to the patient's insight, which is not the central detail provided in the stem.

Concept Tested & Keywords

• Concept Tested: Classification of Hallucinations
• Stem keywords: hearing voices, rotating fan, hallucination
• Lead-in keywords: Which type
• Clinical cues: The hallucination is triggered by a specific, real-world stimulus (a fan).
• Clinical cues: The hallucination stops when the stimulus is removed.

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QGZNbhqK01hlrvNoqtPS8F

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