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Current Topics in CAEPs, presented in partnership with Seminars in Hearing

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1.  The N1 response is fully mature by the age of: 18 weeks 8 months 8 years 18 years

2.  The main generators of the CAEP are anatomically in Heschls gyrus which is in the: Temporal lobe Parietal lobe Frontal lobe Cerebellum

3.  The spectral peak of the near-threshold CAEP is in the range: 0.2 - 0.5 Hz 2 - 5 Hz 20 - 50 Hz 200 - 500 Hz

4.  The CAEP threshold could be defined by any of the following but is defined in this lecture as: the lowest level at which a response is present mid-way between the lowest level at which a response is present and the highest level at which a response is absent the lowest level at which a response is present, with a response absent at a level of 10 dB or less below this level the level corresponding to the zero response amplitude, extrapolated from the amplitude input-output function

5.  There is an average difference between the CAEP threshold and the "true" behavioral threshold, sometimes known as the bias. In adults and using tone burst stimuli this is typically: less than 5 dB 5 -10 dB 10 - 15 dB 15 - 20 dB

6.  When presenting stimuli at conversational levels (i.e. between 55 and 75 dB SPL) in the free field, the following conclusion is reached in this lecture. Hearing aid gain significantly affects CAEP amplitudes: in normal-hearers and hearing-impaired users in normal-hearers but not in hearing-impaired users not in normal-hearers but only in hearing-impaired users not in normal-hearers nor hearing-impaired users

7.  When, starting from an audibility equal to zero, the audibility is being increased indefinitely, the following occurs with the CAEP amplitude: it keeps on increasing indefinitely as well it increases up to a certain point, where it plateaus it does not increase or decrease (it therefore remains constant) it fluctuates randomly

8.  When stimulus audibility is close to threshold, increasing the hearing aid gain will have the following effect on CAEP amplitudes in hearing-impaired wearers: CAEP amplitude will decrease CAEP amplitude will increase CAEP amplitude will stay the same This cannot be predicted. It depends on the stimulus SNR.

9.  Activation of nonlinear frequency compression is associated with: Increase in sensation level at high frequencies Increase in sensation level at low frequencies Decrease in sensation level at high frequencies Decrease in sensation level at low frequencies

10.  Activation of nonlinear frequency compression is associated with: Increase in the presence of CAEPs at high frequencies Increase in the presence of CAEPs at low frequencies Decrease in the presence of CAEPs at high frequencies Decrease in the presence of CAEPs at low frequencies

11.  Which of the following statements is false? Infants who show CAEP responses present to a range of stimuli in both ears are more likely to have higher scores on tests of functional auditory behavior. Infants with absent CAEPs to a range of stimuli may still demonstrate responses to sound in their day-to-day listening environment. It is sufficient to use CAEP testing alone when making decisions about whether an infant should be referred on for cochlear implantation evaluations. Using questionnaires to assess functional auditory behavior engages parents in the observation and management process.

12.  Which of the statements about cortical auditory evoked potentials (CAEPs) is false? An increase in stimulus sensation level has been shown to increase the detection rate of CAEPs in infants with normal hearing and SNHL. CAEPs require lower temporal precision in order to be recorded compared to an ABR. If a CAEP response is absent, it means the infant is unable to hear the sound. Clinicians need to take into account audiological results and parental observations when interpreting absent CAEP results.

13.  Which of the following about auditory neuropathy spectrum disorder (ANSD) is true? A CAEP can be present even when the auditory brainstem response (ABR) is absent in infants with ANSD. If there is a cochlear microphonic present and the ABR is absent at 85 dBHL it means there is a severe-profound hearing loss. CAEPs always deteriorate when infants are fitted with amplification. CAEPs can't be used to assess infants with ANSD, you just have to wait until they are older and can perform reliable behavioral testing before you decide whether to fit hearing aids or not.

14.  According to the Australian Hearing protocol, when CAEPs are detected for a specific speech sound at 75 dB SPL but not at 65 dB SPL, and residual electroencephalogram (EEG) noise levels are acceptable: no change of the estimated audiogram is warranted the audiogram is re-estimated at the corresponding frequency range by 5 dB the audiogram is re-estimated at the corresponding frequency range by 10 dB the audiogram is re-estimated at the corresponding frequency range by 15 dB the client is reassessed with the CAEP test on the same day

15.  According to the Australian Hearing protocol, a valid reason for not conducting a CAEP test is the child: having a severe hearing loss having otitis media being awake and alert being younger than 6 months of age not being able to perform behavioral testing