2The Human EarThe function of the ear is to gather sound waves and send or transmit, information about sound to your brainYour ear has three main sections:The Outer EarThe Middle EarThe Inner EarEach section has its own unique function
3The Outer Ear The outer ear looks and functions like a funnel The main function of the outer ear is to funnel sound wavesThe components of the outer ear are the ear canal and eardrum
4The Outer EarThe outer ear collects sound waves and directs them into a narrow region called the ear canalThe ear canal is a few centimeters long and ends at the eardrumThe eardrum is a small tightly stretched, drumlike membraneSound waves make your eardrum vibrate
5The Middle Ear The middle ear is located behind the eardrum The middle ear contains the three smallest bones in your bodyThe hammerThe hammer is attached to the eardrum and vibrates when the eardrum vibratesThe hammer transmits vibrations to the anvil first and the stirrups secondThe anvilThe stirrup
6Inner Ear The inner ear is separated from the middle ear by a membrane When the stirrup vibrates it vibrates against the membrane and the vibrations pass into the cochleaThe Cochlea is a fluid-filled cavity shaped like a snail shellThe cochlea contains more than 10,000 tiny structures called hair cells
7The Inner EarThe tiny hair cells have hairlike projections that float in the fluid of the cochleaWhen vibrations move through the fluid the hair cells move, causing messages to be sent to the brain via the auditory nerveThe brain processes the messages and tells you what you’ve heard
8Hearing LossWhen hearing loss occurs a person may have difficulty hearing soft sounds or high-pitched soundsThere are many different causes of hearing loss such as, injury, infection, exposure to loud sounds, and aging
9Causes of Hearing LossInjury: Hearing loss can occur when the eardrum is damaged or punctured.This is why it is dangerous to stick objects in your earsInfection: Can cause damage to the delicate inner ear and cause permanent hearing loss
10Causes of Hearing LossExtended exposure to loud sounds can damage hair cells in the earThe damaged hair cells will no longer be able to send signals to the brainThis type of damage can be prevented!Aging: This is the most common form of hearing loss and it occurs graduallyAs people get older their hair cells in the cochlea begin to die ( AND THEY CANNOT BE REPLACED)People with this kind of hearing loss often have difficulty hearing high-frequency sounds
11Hearing AidsFor certain types of hearing loss, hearing aids can restore some ability to hearHearing aids amplify sounds entering the ear, and others can amplify specific frequencies that they person has lost the ability to hearHearing aids come in all different sizes
12Partner ProjectAsk Your Partner what sound they hear throughout the dayList at least 15 sounds your partner hearsAsk them to rank the sounds they hear ask either painful, quiet, normal, loudThen ask them to rate each sound as pleasant, neutral, or annoyingAlso for each sound record the source, location, time of day, and time exposed to the soundHow are the sound ratings similar? How are they different?
13SoundSourceLocationTime of dayTime of exposurePainful, quiet, normal, loud?Annoying, pleasant, neutral?