IHS Final Study Guide With Correct Questions And Answers

The fleshy part of the ear that protrudes from the side of the head is called the - ANSWER Auricle or Pinna The average adults canal is about _____ inch in length and about _____ inch in diameter - ANSWER 1 and ¼ The cone of light is a reflection of the light from - ANSWER an otoscope on the tympanic membrane The external auditory canal's resonant frequency is - ANSWER about 2700hz and varies slightly from person to person The structure of the tympanic membrane is made up of - ANSWER 3 layers The transduction of energy as acoustical sound courses through the middle ear which is as follows - ANSWER Acoustical energy is changed into mechanical energy at the tympanic membrane and changed into hydraulic energy at the stapes footplate The promontory is located on the medial wall of the middle ear - ANSWER It represents the basal turn of the cochlea Otitis media is an ear infection that may - ANSWER result from Eustachian tube dysfunction Fluid in the middle ear is also called - ANSWER effusion Otosclerosis immobilizes the ossicles at the - ANSWER stapes footplate The cochlea in located with the petrous portion of the temporal bone. It coils in about - ANSWER 2 ½ turns. Uncoiled it measures about 1 inch Three chambers within the inner ear are called - ANSWER scala vestibuli, scala media, scala tympani The basilar membrane and the reissner's membrane - ANSWER separate the cochlea into three chambers. The organ of Corti is - ANSWER the sensory receptor for hearing The hair cells activate the auditory nerve - ANSWER through electrochemical energy The Place Theory of Hearing is simply explained as - ANSWER the basal turn of the cochlea responds to high frequencies and the apical turn of the cochlea responds to low The singular perception of two different signals presented to each ear simultaneously is - ANSWER binaural fusion An octave is the - ANSWER doubling of a frequency •Masking is define as a procedure used to - ANSWER eliminate the participation of the non test ear while measuring some aspect of auditory function in the test ear The symbol used to document that thresholds were measured with masking presented to the NTE are - ANSWER a blue square for the left ear and a red triangle for the right ear The formula used to determine the initial masking intensity to be delivered to the - ANSWER NTE is AC of NTE + 10db The increase in loudness when both ears hear together - ANSWER is binaural summation Sensory/Neural hearing loss is caused by damage or a disorder involving the - ANSWER hair cells or auditory nerve •Recruitment can result in an - ANSWER exaggerated sensitivity to loud sounds •In ears with cochlear damage, the critical bands - ANSWER are wider than 1/3 octave The impact of sensory/neural hearing loss on critical bands results in: - ANSWER difficulty with speech intelligibility in quiet and noise An audiometric finding that may indicate a retrocochlear disorder is: - ANSWER asymmetric word recognition scores in the presence of symmetrical hearing levels Ototoxic medications result in damage to - ANSWER the organ of Corti A neural disconnection of the auditory centers of the cortex with the rest of the hearing system is - ANSWER known as "central deafness". A tympanometer is used to measure - ANSWER middle ear function For threshold measurement each tone presented should be about - ANSWER 2 second in duration Test/retest reliability for threshold measurements - ANSWER is: + 5 db The hearing instrument specialist must be familiar with the upper limit for threshold determination because it: - ANSWER differs with stimulus (frequency or speech) and with transducer The headband for the bone conduction transducer applies pressure on the oscillator - ANSWER holding it firmly against the most prominent point on the mastoid The frequency order for BC threshold measurement is - ANSWER 1000 Hz, 2000 Hz, 4000 Hz, retest 1000 Hz, 500 Hz and 250 Hz An air-bone gap is defined as a - ANSWER 15 dB or greater difference between the air and bone conduction thresholds of the same ear Masking is define as a procedure used to - ANSWER eliminate the participation of the non-test ear while measuring some aspect of auditory function in the test ear Plateau refers to the - ANSWER stability in measurement of TE threshold with successive increases in masking intensity The symbols used to document that thresholds were measured with masking presented to the NTE are: - ANSWER a blue square for the left ear and a red triangle for the right ear Crossover is the - ANSWER intensity of the sound that is heard by the non-test cochlea through intracranial stimulation when the TE is stimulated at a high intensity. Masking for BC threshold measurement is required when - ANSWER an air-bone gap is present at any frequency The patient's/client's hearing levels measured by AC show that the left ear is better. With the BC oscillator is placed on the left mastoid process, it is reasonable to assume that the results reflect left ear cochlear function. - ANSWER False - when any hearing asymmetry is evident, only accurate threshold measurements using masking, as appropriate, will determine true hearing levels for AC and Bc IA for BC - ANSWER is 0 db Overtones are also called - ANSWER harmonics Vowels are an example of an - ANSWER phonemic complex sounds Noise is an example of an - ANSWER Formant complex sound Rollover is is a decrease in word recognition performance at higher intensity levels - ANSWER and is associated with retrocochlear disorder The discrete sounds of speech - ANSWER are called phonemes The auditory space between threshold and UCL is called - ANSWER Dynamic Range The procedure for measuring UCL is - ANSWER present a pulsed tone at 70 dB HL or conversational speech at MCL and increase intensity in 5 dB steps until the patient/client indicates that it is uncomfortably loud A degradation in word recognition in the binaural condition compared to right and left monaural conditions is called - ANSWER binaural interference Tympanometry is one component of a test battery called - ANSWER immittance audiometry Normal middle ear pressure with normal compliance is a - ANSWER Type A tympanogram A markedly non-compliant middle ear system with a normal external ear canal volume is demonstrated as a - ANSWER Type B tympanogram Abnormally negative middle ear pressure with normal compliance is a - ANSWER Type C tympanogram Hearing loss associated with otitis media - ANSWER is typically conductive but may present as mixed Guiding a patient/client through the process of setting realistic expectations for himself is called - ANSWER counseling Hearing instrument gain, output, and frequency response are conveniently specified by a shorthand called a - ANSWER Matrix The difference between a thin-tube fitting and an open fitting is - ANSWER a thin-tube fitting can use either a dome or a custom earmold, whereas an open fitting refers to the use of a highly vented earpiece with either a thin-tube or a RIC When applied to hearing instrument fittings, Boyle's Law is - ANSWER the inverse relationship between depth in the ear canal of a hearing instrument fitting and the SPL the instrument produces at the TM One acoustical benefit of a CIC or IIC over an ITE is - ANSWER the need for less gain in the high frequencies Concha and external ear canal resonances contribute to the frequency response of - ANSWER RIC/RITE with an open dome Venting has 2 purposes - ANSWER to modify the hearing instrument's frequency response and to relieve a feeling of pressure in the ear canal The horn effect is - ANSWER a progressive change in diameter of the sound bore that provides high frequency emphasis in the response of the hearing instrument system One component of dispensing BTE hearing instruments is to - ANSWER measure and cut the custom earmold tubing to the appropriate length to allow the hearing instrument