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Overview of Current Events

  • Alert was issued for students in Tumblritch regarding a safety situation.

  • Acknowledgment of tragic events with reports of multiple fatalities.

  • Communication encouraging students to stay safe, especially those in Tumblritch.

  • Reference to college closure related to the ongoing situation.

Structure and Function of the Ear

General Introduction

  • The ear consists of various structures, each contributing to the sense of hearing.

  • Key components include the outer ear, middle ear, and inner ear.

Outer Ear

  • Pinna: The visible part of the ear; functions as a sound collector and funnel.

  • Auditory Canal: A short tunnel, approximately 2.5 centimeters long, guiding sound waves to the eardrum.

  • Eardrum (Tympanic Membrane): A thin membrane that vibrates upon sound wave contact, transmitting vibrations to the middle ear structures.

Middle Ear

  • Contains three tiny bones known as the ossicles:

    • Hammer: Transmits vibrations from the eardrum.

    • Anvil: Connects the hammer to the stirrup.

    • Stirrup: Connects to the oval window of the cochlea.

  • Function: Amplifies sound through the vibrations of these bones.

Inner Ear

  • Cochlea: A snail-shaped structure filled with fluid; converts sound vibrations into neural signals.

    • Basilar Membrane: A membrane within the cochlea that contains the organ of Corti.

    • Organ of Corti: Houses hair cells that send auditory signals to the auditory cortex via the auditory nerve.

    • Function: The louder the sound, the greater the number of activated hair cells.

Pitch Processing Theories

Introduction to Pitch

  • Pitch: The psychological experience of sound associated with sound wave frequency.

    • Higher frequencies correspond to higher pitches (e.g., whistle sounds).

    • Lower frequencies correspond to lower pitches (e.g., drum or bass guitar sounds).

Theories of Pitch Processing

  1. Place Theory

    • Suggests that different pitches are perceived due to the specific stimulation of hair cells at varying locations along the organ of Corti.

    • High pitches stimulate hair cells at the cochlea's base; low pitches stimulate hair cells at the cochlea's tip.

  2. Frequency Theory

    • Proposes that pitch perception is related to the rate of vibrations in the basilar membrane.

  3. Volley Principle

    • Explains that when frequencies between 400 Hz and 4000 Hz are detected, neurons in the auditory system take turns firing, creating a collaborative response to sound frequencies.

Hearing Loss Types and Treatment Options

Conductive Hearing Loss

  • Results from issues in the outer or middle ear impacting sound wave transmission.

  • Can be caused by:

    • Damage to the eardrum.

    • Dysfunction of the ossicles.

  • Treatment options include:

    • Medical procedures.

    • Hearing aids to amplify sound.

Sensorineural Hearing Loss

  • Occurs due to damage in the inner ear or auditory pathways in the brain.

  • Often permanent and challenging to treat.

  • Treatment options include:

    • Cochlear implants to stimulate the auditory nerve directly when traditional hearing aids are ineffective.

Cochlear Implants

  • Definition: A medical device aiding individuals with sensorineural hearing loss by bypassing damaged ear portions.

  • How it works: Converts sound signals into electrical impulses that are sent to the brain via the electrode array positioned in the cochlea.

  • Notable improvements in speech perception for users.

Upcoming Class Announcements

  • Next class will focus on chemical senses, specifically taste, concluding the current unit.

  • Mention of a week delay in quizzes to ensure full understanding of concepts.

  • Reminder to check the syllabus for lecture timings.

LockDown Browser

  • All students are required to install the Respondus LockDown browser for quiz integrity, preventing access to unauthorized resources during assessments.

  • Instructions to download and install the browser provided for usage during tests.