---
title: "Sensorineural Deafness — AP Psychology Definition & Exam Guide"
description: "Sensorineural deafness is hearing loss from damage to the cochlea or auditory nerve. Learn how it shows up in AP Psych Unit 1 and how to tell it apart from conduction deafness."
canonical: "https://fiveable.me/ap-psych-revised/key-terms/sensorineural-deafness"
type: "key-term"
subject: "AP Psychology"
unit: "Unit 1"
---

# Sensorineural Deafness — AP Psychology Definition & Exam Guide

## Definition

Sensorineural deafness is a type of hearing loss caused by damage to the inner ear (the cochlea) or the auditory nerve, which disrupts the transduction of sound into neural signals the brain can process.

## What It Is

Sensorineural deafness is hearing loss that happens deep in the auditory system, not at the door. The damage is to the **cochlea** (the inner ear structure with the tiny hair cells that turn vibrations into neural signals) or to the **auditory nerve** that carries those signals to [the brain](/ap-psych-revised/unit-1/4-the-brain/study-guide/zffu0vU5m7HwEMsU "fv-autolink"). When those parts break down, sound can reach the inner ear just fine, but it never gets fully transduced into a message the brain can read.

This ties straight back to one of the core ideas in AP Psych: **[transduction](/ap-psych-revised/key-terms/transduction "fv-autolink")**, the process of converting physical stimuli into neurochemical messages. In sensorineural deafness, transduction is exactly what fails. Common causes include aging and prolonged exposure to loud noise. Think factory machinery, concerts, or earbuds cranked too high. That repeated loud sound wears down the cochlea's hair cells, and unlike a clogged middle ear, those cells don't grow back.

## Why It Matters

Sensorineural deafness lives in **[Unit 1](/ap-psych-revised/unit-1 "fv-autolink"): Biological Bases of Behavior**, specifically Topic 1.6 Sensation. It's named directly in learning objective **[AP Psych Revised](/ap-psych-revised "fv-autolink") 1.6.C**, which asks you to explain how the structures and functions of the auditory system relate to behavior and mental processes. The essential knowledge for that objective lists exactly two types of hearing loss you need to know: conduction deafness and sensorineural deafness. So this is not a niche term. It's a labeled, testable distinction. Knowing where the damage occurs (inner ear and nerve vs. middle ear) is the whole point.

## Connections

### [Transduction (Unit 1)](/ap-psych-revised/key-terms/transduction)

Transduction is the conversion of physical stimuli into neural signals, and sensorineural deafness is what happens when that conversion machinery breaks. The cochlea's hair cells are the transducers for sound, so damaging them means the brain never receives a clear signal.

### [Place Theory (Unit 1)](/ap-psych-revised/key-terms/place-theory)

[Place theory](/ap-psych-revised/key-terms/place-theory "fv-autolink") says different spots along the cochlea respond to different pitches. High-frequency sounds map to one region, low to another. Age-related sensorineural loss often hits high-frequency hearing first, which lines up with damage to specific places on the cochlea.

### [Pitch (Unit 1)](/ap-psych-revised/key-terms/pitch)

[Pitch](/ap-psych-revised/key-terms/pitch "fv-autolink") is determined by sound wavelength, and how we perceive it depends on a healthy cochlea. Sensorineural damage doesn't just make things quieter, it can distort which pitches you can hear at all, which is why older adults often lose high frequencies before low ones.

## On the AP Exam

On the multiple-choice section, this term shows up in scenario questions where you read a short case and pick the type of hearing loss. The dead giveaway for sensorineural deafness is damage located in the **cochlea or auditory nerve**, often caused by loud noise exposure or aging. If the question describes a worker who lost hearing after years near loud machinery and an audiologist traces the damage to the cochlea and auditory nerve, that's sensorineural. Watch for the trap version: damage to the **ossicles** in the middle ear after an ear infection is conduction deafness, not sensorineural. You may also see data questions about age-related hearing loss, like comparing thresholds at 8000 Hz versus 1000 Hz, which test whether you understand that high frequencies tend to go first. No released FRQ has used this term verbatim, but it fits the kind of structure-and-function reasoning Unit 1 expects.

## sensorineural deafness vs conduction deafness

Both are hearing loss, but the location of the damage is the whole difference. Conduction deafness is a mechanical problem in the outer or middle ear, like damaged eardrum or ossicles, so the sound vibrations never reach the cochlea. Sensorineural deafness is a problem in the inner ear or auditory nerve, where the cochlea and nerve can't transduce or transmit the signal. Quick test: ossicles damaged equals conduction; cochlea or nerve damaged equals sensorineural.

## Key Takeaways

- Sensorineural deafness comes from damage to the inner ear (cochlea) or the auditory nerve, the parts responsible for transducing and transmitting sound.
- Common causes are aging and prolonged exposure to loud noise, both of which wear down the cochlea's hair cells.
- It's one of two named hearing-loss types in learning objective AP Psych Revised 1.6.C, paired with conduction deafness.
- The cleanest way to tell it apart from conduction deafness is the location of damage: cochlea or nerve means sensorineural, middle-ear ossicles means conduction.
- Age-related sensorineural loss often hits high frequencies first, which connects to place theory of pitch perception.

## FAQs

### What is sensorineural deafness in AP Psych?

It's hearing loss caused by damage to the cochlea (inner ear) or the auditory nerve, which disrupts the transduction of sound into neural signals. It's tested in Unit 1, [Topic 1.6](/ap-psych-revised/unit-1/6-sensation/study-guide/AqnAHVH2Nu3Kj5jb "fv-autolink"), under learning objective AP Psych Revised 1.6.C.

### Is sensorineural deafness the same as conduction deafness?

No. Conduction deafness is a mechanical problem in the outer or middle ear, like damaged ossicles, so sound can't reach the cochlea. Sensorineural deafness is damage to the cochlea or auditory nerve itself. The location of the damage is what tells them apart on the exam.

### What causes sensorineural deafness?

Aging and prolonged exposure to loud noise are the big two. Both damage the hair cells in the cochlea, and those cells don't regenerate, which is why this kind of loss is usually permanent.

### How do I know if a question is about sensorineural or conduction deafness?

Look for where the damage is. If the scenario mentions the cochlea or auditory nerve, or loud-noise or age-related damage, it's sensorineural. If it mentions the ossicles, eardrum, or an ear infection blocking the middle ear, it's conduction.

### Why do older adults lose high-pitched hearing first?

Age-related sensorineural loss tends to damage the part of the cochlea that responds to high frequencies. That connects to place theory, which says different spots on the cochlea handle different pitches, so high-frequency hearing fades before low-frequency hearing.

## Related Study Guides

- [1.6 Sensation](/ap-psych-revised/unit-1/6-sensation/study-guide/AqnAHVH2Nu3Kj5jb)

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