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Trial registered on ANZCTR

Registration number
Ethics application status
Not yet submitted
Date submitted
Date registered
Date last updated
Type of registration
Prospectively registered

Titles & IDs
Public title
The Neural Processing of Speech Sounds in Hearing Impaired Children
Scientific title
The sensitivity of cortical evoked auditory potentials to speech sounds in hearing impaired children
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Hearing Impairment 4842 0
Condition category
Condition code
Ear 237185 237185 0 0

Study type
Patient registry
Target follow-up duration
Target follow-up type
Description of intervention(s) / exposure
cortical evoked potentials will be performed while speech sounds are played via a loud speaker. This will be performed once, in a 30 minute session.
Intervention code [1] 236622 0
Not applicable
Comparator / control treatment
no control
Control group

Primary outcome [1] 238003 0
To show that acoustic changes in the spectral and temporal characteristics of speech (e.g., change in formant frequency or voice onset time) can be measured acoustically at the eardrum. a probe microphone and real ear measurement system will be used to record the sound at the ear drum.
Timepoint [1] 238003 0
This will be measured at the time of the research appointment, immediately prior to the measurement of the cortical evoked potentials (CAEPs)
Secondary outcome [1] 242268 0
To show that acoustical changes in speech sounds measured at the eardrum correlate with changes in the speech-evoked cortical auditory evoked potentials (CAEP). the CAEP will be measured via surface electrodes on the scalp
Timepoint [1] 242268 0
the speech-evoked cortical auditory evoked potentials (CAEP) will be measured at the time of the research appointment

Key inclusion criteria
Hearing loss
English speaking
Minimum age
3 Months
Maximum age
15 Years
Both males and females
Can healthy volunteers participate?
Key exclusion criteria
Any individuals with known central nervous system (CNS) dysfunction, autism or attention deficit hyperactivity disorder (ADHD) will be excluded from the study.

Study design
Natural history
Defined population
Statistical methods / analysis

Recruitment status
Not yet recruiting
Date of first participant enrolment
Date of last participant enrolment
Date of last data collection
Sample size
Accrual to date
Recruitment outside Australia
Country [1] 1802 0
New Zealand
State/province [1] 1802 0

Funding & Sponsors
Funding source category [1] 5005 0
Name [1] 5005 0
University of Auckland
Address [1] 5005 0
261 Morrin Road,
Glen Innes
Auckland 1072
Country [1] 5005 0
New Zealand
Primary sponsor type
university of auckland
261 Morrin Road,
Glen Innes
Auckland 1072
New Zealand
Secondary sponsor category [1] 4525 0
Name [1] 4525 0
Auckland Distract Health Board (ADHB) Audiology
Address [1] 4525 0
ADHB Audiology
Green Lane Clinical Centre
One Tree Hill
Auckland 1051
Country [1] 4525 0
New Zealand

Ethics approval
Ethics application status
Not yet submitted
Ethics committee name [1] 7106 0
Ethics committee address [1] 7106 0
Ethics committee country [1] 7106 0
Date submitted for ethics approval [1] 7106 0
Approval date [1] 7106 0
Ethics approval number [1] 7106 0

Brief summary
Research has shown that cortical auditory evoked potentials (CAEPs) can be used to objectively verify neural processing of speech sounds and to show that hearing aids provide speech detection in very young infants who cannot be tested using behavioural or observational methods. It is not possible to determine by simple observation whether a young infant who is deaf or hearing impaired is successfully processing speech sounds and hence an objective method to determine both detection and discrimination is required. The aim of the study is to determine whether changes in spectral and temporal characteristics of speech sounds, as measured using a probe microphone at the eardrum, are reflected in the CAEP characteristics measured from scalp surface electrodes. If CAEPs are sensitive to speech changes, this technique can be used as an objective indicator of speech discrimination. This technique has potential for early detection of auditory processing disorder, as well as hearing aid evaluation in young infants found to have a hearing loss as a result of newborn hearing screening.
Trial website
Trial related presentations / publications
Public notes

Principal investigator
Name 29637 0
Address 29637 0
Country 29637 0
Phone 29637 0
Fax 29637 0
Email 29637 0
Contact person for public queries
Name 12884 0
Genevieve Mercer
Address 12884 0
26 Claremont St
Auckland 1023
Country 12884 0
New Zealand
Phone 12884 0
+64 27 634 0438
Fax 12884 0
Email 12884 0
Contact person for scientific queries
Name 3812 0
Genevieve Mercer
Address 3812 0
26 Claremont St
Auckland 1023
Country 3812 0
New Zealand
Phone 3812 0
+64 27 634 0438
Fax 3812 0
Email 3812 0

No information has been provided regarding IPD availability
Summary results
No Results