To measure the gap detection threshold in CI users and (NH control subjects) considering the effect with speech-like stimuli using direct stimulation or CI device.
ID
Source
Brief title
Condition
- Hearing disorders
Synonym
Research involving
Sponsors and support
Intervention
Outcome measures
Primary outcome
The threshold duration for identification of the gaps.
Secondary outcome
Not applicable
Background summary
It is well known that the cochlear implant (CI) devices assist in hearing and
understanding speech. This is a highly specialized research designed to study
only one aspect of the CI processing: Gap detection. In this experiment we will
test the gap detection ability of the CI users with the speech as stimulus and
compare them with normal hearing (NH) as control. We try to find the temporal
threshold of gap detection in CI users.
Gap detection is the ability of listeners to detect silent periods in a
continuous auditory stimulus. It is a measure of auditory temporal acuity. It
is an essential process for distinguishing speech sounds and identifying
phonemes even in NH listeners. For CI users it is of even more paramount
importance because they rely heavily on temporal cues for understanding of
speech.
Relatively little is known about the temporal acuity and gap detection
abilities of impaired hearing. Even lesser is known about gap detection
abilities in a complex time-varying stimulus such as speech. A previous study
(Bhargava and Ba*kent, 2011) has shown that CI users may have difficulty in
detecting gaps in speech like stimuli. The question is, what causes this? This
could be due to the limitations imposed either by cognitive processing in CI
users or by various aspects of CI processing involved in CI devices. By
bypassing the CI device processor we would be able to rule out the effect of CI
processor and provide more controlled stimuli.
Study objective
To measure the gap detection threshold in CI users and (NH control subjects)
considering the effect with speech-like stimuli using direct stimulation or CI
device.
Study design
Psychophysical hearing tests, intraparticipant comparison
Intervention
Not applicable
Study burden and risks
There is a small risk of too loud and unpleasant sound. This risk is excluded
through the proper setting of the implant device. Apart from this, the
equipment has been tested rigorously in advance to avoid the risk.
Apart from this risk, there are no other known risks to human subjects
participating in this study. The implant is not able to generate electric
currents to be which are harmful to the ear or the auditory nerve. This also
applies if the implant is "controlled" from a computer, such as in these
experiments.
Nevertheless, there is an insurance which covers any damage when,
unfortunately, something should go wrong during the study. Subjects are
informed about the existence of this insurance.
Hanzeplein 1
Groningen 9700RB
NL
Hanzeplein 1
Groningen 9700RB
NL
Listed location countries
Age
Inclusion criteria
CI users: AB CI device; post-lingually implanted, with a free-field phoneme score better than or equal to 50% at 65 dB SPL; At least one year experience of using the CI. ;NH subjects: Hearing loss should be less than 20 dB HL for 500, 1000, 2000, and 4000 Hz.;Bothl: Native speakers of Dutch, of age between 18 years to 90 years;
Exclusion criteria
Inability to cooperate, medical and technical complications and pre lingual deafness.
Design
Recruitment
Followed up by the following (possibly more current) registration
No registrations found.
Other (possibly less up-to-date) registrations in this register
No registrations found.
In other registers
| Register | ID |
|---|---|
| CCMO | NL38315.042.11 |