All About the Ears
The 2 cues for localization in the horizontal plane.
What are Interaural Timing difference and Intramural level differences?
The 4 types of OAEs.
What are Spontaneous OAE, Transient/click OAE, Distortion Product OAE, and Stimulus Frequency OAE
SOAE, TEOAE, DPOAE, SFOAE
The type of wave that are sound waves.
The amount of dB between 1 octave on the audiogram that is specified by ANSI standards.
What is 20 dB?
The 5 components to a HA test box.
1. isolating sound chamber.
2. test mic
3. reference mic
4. speaker
5. coupler
High Intensity sounds are ___ frequency specific and low intensity sounds are ___ frequency specific.
What is less and more?
An internationally recognized method to describe and apply the location of scalp electrodes in the context of an EEG test or experiment.
What is the International 10-20 System?
Sounds are described as a combination of sine waves differing in these 3 characteristics.
What is frequency, amplitude, and starting phase?
The 4 effects of hearing loss. Name 3.
What is decreased ...
audibility
frequency resolution
dynamic range
temporal resolution
The amount of compression applied to a signal once the threshold knee point has been reached.
What is compression ratio?
The 2 ways neurons code for intensity.
What are high spontaneous fibers and low spontaneous fibers?
The ABR response is seen between __ and __ ms post-stimulus.
What is 1.5-15 ms?
(2-12 also found)
The 2 psychoacoustic processes of masking.
What are swamping and suppression?
The averages for occlusion effects using headphones and inserts for 250, 500, and 1000 Hz.
Headphones - Inserts -
250 = 30 dB 250 = 10 dB
500 = 20 dB 500 = 10 dB
1000 = 10 dB 1000 = 0 dB
3 Red Flags that necessitate referral before a HA fitting.
Congenital or trauma deformity of the ear; otorrhea within 90 days; otalgia; cerumen or foreign body in EAC; unilateral or asymmetric tinnitus; statistically significant different WRS; sudden onset or rapidly progressing HL within 90 days; 15 dB HL ABG at 500, 1000, and 2000
The pathway of an ipsilateral acoustic reflex.
Sound - ME - oval window - cochlea - CN VIII - Ventral cochlear nucleus - Ipsilateral MSO (SOC) - Motor nucleus of CN VII - CN VII - stapedius muscle in ME
The 3 measures used to interpret the presence or absence of DPAOEs.
1. Noise floor is low - <10 dB
2. Amplitude of emission is > -10 dB
3. SNR > 6 dB
The steps for solving a (log) problem.
1. Convert main number to scientific notation.
2. Turn exponent into the characteristic
3. Reference common log table using S.N. # to find mantissa (first 2 namers = row, last number = column)
4. Put characteristic and mantissa together
The range for normal adult static acoustic admittance according to PEC norms.
What is .2 - 1.5 mL?
The fitting formula that maximizes comfort with less gain and more compression. It is typically used for adults.
What is NAL-NL2?
The 4 main proteins that work in the cochlear. Name 3.
What is actin, myosin, prestin, and connexin?
The auditory pathway of the 7 ABR waves.
Wave I - extra cranial portion of CN VIII
Wave II - intracranial portion of CN VIII
III - Cochlear Nucleus
IV - Superior Olivary Complex
V - Lateral Lemniscus
VI - Inferior Colliculus
VII - Medial Geniculate Body
The phenomenon that is evidence for the ability to compare temporal information across filters using envelope fluctuation. The bigger the bandwidth, the greater the effect.
What is the Co-modulation Masking Release (CMR)?
The method to determine the need for masking for bone conduction AND the way to calculate the IML for BC masking.
Need to mask - ABG > 10 dB
IML = AC nte + 10 dB + OE
Determine the difference between and occlusion complaint and an amplification complaint.
Occlusion complaint will not go away when hearing aid is turned off.
Amplification complaint will go away when hearing aid is turned off.