What is the physiological response of the ear to the intensity of sound? & x20; - RRB Nsg. Superintendent-21 July 2019 (Shift-2nd)

RRB Nsg. Superintendent-21 July 2019 (Shift-2nd)

Applied Physiology

Easy

Appeared in: RRB Nsg. Superintendent-21 July 2019 (Shift-2nd)

Explanation

Loudness is the subjective perception or physiological response to the physical intensity of a sound wave.
As sound intensity increases, it causes a greater amplitude of vibration in the basilar membrane of the cochlea.
The brain interprets the resulting increased firing rate of auditory nerve fibers and the recruitment of more hair cells as the sensation of greater loudness.

Option A: Inertia is a principle in physics describing an object's resistance to a change in its state of motion. It is not a physiological or perceptual response of the auditory system.
Option B: Transmission refers to the physical conduction of sound waves through the structures of the ear (e.g., through the ossicles and cochlear fluid). It is the mechanical process that enables hearing, not the brain's interpretation of the sound's strength.
Option C: Sound is a form of energy, and intensity is a measure of this energy. 'Energy' is the physical stimulus itself, not the physiological response or perception of that stimulus.

Visual 1: Diagram: The Human Ear - Illustrating the path of sound from the outer ear to the cochlea, showing how sound waves are transmitted and converted into neural signals.
Visual 2: Infographic: Intensity vs. Loudness - A visual comparison showing how physical sound intensity (measured in W/m²) corresponds to perceived loudness (measured in decibels), highlighting the non-linear, compressive relationship.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Auditory Physiology: Perception of Sound Intensity as background academic context rather than a clinical decision trigger.
Understanding the difference between physical intensity and perceived loudness is fundamental for nurses and audiologists when interpreting hearing tests (audiometry) and counseling patients about hearing protection.
This concept helps explain hearing disorders like hyperacusis, where patients have a decreased tolerance and an abnormally strong perception of loudness to sounds of normal intensity.
What if? A patient with sensorineural hearing loss reports that when a sound is finally loud enough for them to hear, it quickly becomes uncomfortably loud. This phenomenon, known as 'recruitment', is due to damaged outer hair cells and reflects a problem in the physiological processing of loudness, not just intensity.

How to Approach the Question

First, analyze the question's core components. It asks for the 'physiological response' to a physical stimulus, which is the 'intensity of sound'.
Recognize the distinction between a physical property (something measurable in the environment, like energy or pressure) and a perceptual response (a subjective experience created by the brain).
Evaluate the options through this lens. 'Inertia', 'Transmission', and 'Energy' are all terms related to the physics of sound and its movement.
Identify 'Loudness' as a psychoacoustic term that specifically describes the subjective, perceived experience of sound intensity.
Conclude that 'Loudness' is the correct term for the physiological and psychological response to sound intensity.

Concept Tested & Keywords

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