Hand Cupped Behind Ear Correct Answer: -first Hearing Aid
-increased sound by 5-8db
-included horns,trumpets, speaking tubes
1892 Correct Answer: -carbon amplifiers patent by Alexander Bell
-marketed 1902-1903 until 1930;first patent for a telephone type hearing instrument
1920 Correct Answer: large vacuum tubes; not portable
1938 Correct Answer: miniature vacuum tube ;crystal receivers
1930 Correct Answer: diameter reduced
1940 Correct Answer: bone conduction receivers were introduced
1946 Correct Answer: first telecoil introduced
1950 Correct Answer: bodyworn HA became convenient size
1948 Correct Answer: transistor invented
1954 Correct Answer: eyeglasses aids introduced
1974 Correct Answer: microphones electrets were introduced
1964 Correct Answer: intergrated circuit(transistors, resistors, wiring...)
1952 Correct Answer: first transistors
The Most Important function of the oval window is to : Correct Answer: transfer vibration from
the ossicular chain
Hair Cells a rise from the layer on top of the : Correct Answer: organ of corti
The theory of hearing that is considered the most accurate is : Correct Answer: Place Theory,
Volley Theory, Temporal Theory
The Three semicircular canals are: Correct Answer: 1)90degress angle to one another
2)superior,posterior, and lateral
3)detectors of rotational movement in any direction
The average length of an uncoiled basilar membrane is Correct Answer: 35mm
, The name given to the nerve cells connecting the organ of corti to the 8th cranial Nerve is :
Correct Answer: Spiral Ganglia
The Theory of hearing that describes the cochlea as consisting of nerve ending with hair cells
that respond to specific frequencies: Correct Answer: The Place Theory
The basilar membrane is located: Correct Answer: In the scala media
Sounds appear to be louder when both ears hear together because of: Correct Answer: binaural
summation
Collectively the semi circular canals are called the Correct Answer: vestibular system
The inability of the brain to accurately process auditory stimuli is called a Correct Answer:
Central Hearing Loss
A Congential hearing loss : Correct Answer: is always present @ or near birth
Tinnitus is most common in : Correct Answer: SNHL sensorineural hearing loss
A small increase in intensity that results in a large increase in perceived loudness is call: Correct
Answer: recruitment
A central hearing loss involves the : Correct Answer: cochlea& auditory nerve
Common symptoms of Meniere's syndrome include: Correct Answer: tinnitus, vertigo, hearing
loss
Acoustic trauma is caused by : Correct Answer: sudden impact noise
Noise in the head such as roaring, hissing, buzzing or ringing is called: Correct Answer: tinnitus
Hearing loss from noise exposure is usually due to: Correct Answer: cochlear hair cell damage
A damaged Organ of Corti can cause a : Correct Answer: SNHL
Carbon Amplifiers Correct Answer: provided enough gain to help many people
Vacuum tube amplifiers of the 1920's Correct Answer: were not portable
The miniature vacuum tube of 1938 Correct Answer: allowed powerful hearing aids to be body
Inflworn
the first head worn hearing aid was Correct Answer: eyeglass aids
Electricity is Correct Answer: the flow of electrons