scholarly journals Cochlear implant patients’ localization using interaural level differences exceeds that of untrained normal hearing listeners

2012 ◽  
Vol 131 (5) ◽  
pp. EL382-EL387 ◽  
Author(s):  
Justin M. Aronoff ◽  
Daniel J. Freed ◽  
Laurel M. Fisher ◽  
Ivan Pal ◽  
Sigfrid D. Soli
Keyword(s):  
Cochlear Implant ◽  
Normal Hearing ◽  
Interaural Level Differences

scholarly journals Head Shadow, Summation, and Squelch in Bilateral Cochlear-Implant Users With Linked Automatic Gain Controls

2021 ◽  
Vol 25 ◽  
pp. 233121652110181
Author(s):  
Taylor A. Bakal ◽  
Kristina DeRoy Milvae ◽  
Chen Chen ◽  
Matthew J. Goupell
Keyword(s):  
Cochlear Implant ◽  
Functional Performance ◽  
Binaural Hearing ◽  
Normal Hearing ◽  
Functional Asymmetry ◽  
Speech Understanding ◽  
Speech Understanding In Noise ◽  
Bilateral Cochlear Implant ◽  
Automatic Gain Controls ◽  
Interaural Level Differences

Speech understanding in noise is poorer in bilateral cochlear-implant (BICI) users compared to normal-hearing counterparts. Independent automatic gain controls (AGCs) may contribute to this because adjusting processor gain independently can reduce interaural level differences that BICI listeners rely on for bilateral benefits. Bilaterally linked AGCs may improve bilateral benefits by increasing the magnitude of interaural level differences. The effects of linked AGCs on bilateral benefits (summation, head shadow, and squelch) were measured in nine BICI users. Speech understanding for a target talker at 0° masked by a single talker at 0°, 90°, or −90° azimuth was assessed under headphones with sentences at five target-to-masker ratios. Research processors were used to manipulate AGC type (independent or linked) and test ear (left, right, or both). Sentence recall was measured in quiet to quantify individual interaural asymmetry in functional performance. The results showed that AGC type did not significantly change performance or bilateral benefits. Interaural functional asymmetries, however, interacted with ear such that greater summation and squelch benefit occurred when there was larger functional asymmetry, and interacted with interferer location such that smaller head shadow benefit occurred when there was larger functional asymmetry. The larger benefits for those with larger asymmetry were driven by improvements from adding a better-performing ear, rather than a true binaural-hearing benefit. In summary, linked AGCs did not significantly change bilateral benefits in cases of speech-on-speech masking with a single-talker masker, but there was also no strong detriment across a range of target-to-masker ratios, within a small and diverse BICI listener population.

scholarly journals Logatome Discrimination in Cochlear Implant Users: Subjective Tests Compared to the Mismatch Negativity

2010 ◽  
Vol 10 ◽  
pp. 329-339 ◽  
Author(s):  
Torsten Rahne ◽  
Michael Ziese ◽  
Dorothea Rostalski ◽  
Roland Mühler
Keyword(s):  
Speech Perception ◽  
Cochlear Implant ◽  
Mismatch Negativity ◽  
Speech Intelligibility ◽  
Event Related Potentials ◽  
Normal Hearing ◽  
Discrimination Test ◽  
Speech Database ◽  
Automated Speech Recognition ◽  
Related Potentials

This paper describes a logatome discrimination test for the assessment of speech perception in cochlear implant users (CI users), based on a multilingual speech database, the Oldenburg Logatome Corpus, which was originally recorded for the comparison of human and automated speech recognition. The logatome discrimination task is based on the presentation of 100 logatome pairs (i.e., nonsense syllables) with balanced representations of alternating “vowel-replacement” and “consonant-replacement” paradigms in order to assess phoneme confusions. Thirteen adult normal hearing listeners and eight adult CI users, including both good and poor performers, were included in the study and completed the test after their speech intelligibility abilities were evaluated with an established sentence test in noise. Furthermore, the discrimination abilities were measured electrophysiologically by recording the mismatch negativity (MMN) as a component of auditory event-related potentials. The results show a clear MMN response only for normal hearing listeners and CI users with good performance, correlating with their logatome discrimination abilities. Higher discrimination scores for vowel-replacement paradigms than for the consonant-replacement paradigms were found. We conclude that the logatome discrimination test is well suited to monitor the speech perception skills of CI users. Due to the large number of available spoken logatome items, the Oldenburg Logatome Corpus appears to provide a useful and powerful basis for further development of speech perception tests for CI users.

scholarly journals Alpha EEG Frontal Asymmetries during Audiovisual Perception in Cochlear Implant Users

2015 ◽  
Vol 54 (06) ◽  
pp. 500-504 ◽  
Author(s):  
A. G. Maglione ◽  
A. Scorpecci ◽  
P. Malerba ◽  
P. Marsella ◽  
S. Giannantonio ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Alpha Rhythm ◽  
Normal Hearing ◽  
Experimental Conditions ◽  
Audiovisual Perception ◽  
Audiovisual Stimuli ◽  
The Difference ◽  
Eeg Alpha ◽  
The One ◽  
Hearing Children

SummaryObjectives: The aim of the present study is to investigate the variations of the electroencephalographic (EEG) alpha rhythm in order to measure the appreciation of bilateral and unilateral young cochlear implant users during the observation of a musical cartoon. The cartoon has been modified for the generation of three experimental conditions: one with the original audio, another one with a distorted sound and, finally, a mute version.Methods: The EEG data have been recorded during the observation of the cartoons in the three experimental conditions. The frontal alpha EEG imbalance has been calculated as a measure of motivation and pleasantness to be compared across experimental populations and conditions.Results: The EEG frontal imbalance of the alpha rhythm showed significant variations during the perception of the different cartoons. In particular, the pattern of activation of normal-hearing children is very similar to the one elicited by the bilateral implanted patients. On the other hand, results related to the unilateral subjects do not present significant variations of the imbalance index across the three cartoons.Conclusion: The presented results suggest that the unilateral patients could not appreciate the difference in the audio format as well as bilaterally implanted and normal hearing subjects. The frontal alpha EEG imbalance is a useful tool to detect the differences in the appreciation of audiovisual stimuli in cochlear implant patients.

scholarly journals Rapid learning of minimally different words in five- to six-year-old children: effects of acoustic salience and hearing impairment

2015 ◽  
Vol 43 (2) ◽  
pp. 310-337 ◽  
Author(s):  
MARCEL R. GIEZEN ◽  
PAOLA ESCUDERO ◽  
ANNE E. BAKER
Keyword(s):  
Cochlear Implant ◽  
Hearing Impairment ◽  
Normal Hearing ◽  
Task Demands ◽  
Deaf Children ◽  
Matching Task ◽  
Object Matching ◽  
Rapid Learning ◽  
Minimal Pairs

AbstractThis study investigates the role of acoustic salience and hearing impairment in learning phonologically minimal pairs. Picture-matching and object-matching tasks were used to investigate the learning of consonant and vowel minimal pairs in five- to six-year-old deaf children with a cochlear implant (CI), and children of the same age with normal hearing (NH). In both tasks, the CI children showed clear difficulties with learning minimal pairs. The NH children also showed some difficulties, however, particularly in the picture-matching task. Vowel minimal pairs were learned more successfully than consonant minimal pairs, particularly in the object-matching task. These results suggest that the ability to encode phonetic detail in novel words is not fully developed at age six and is affected by task demands and acoustic salience. CI children experience persistent difficulties with accurately mapping sound contrasts to novel meanings, but seem to benefit from the relative acoustic salience of vowel sounds.

Frequency Characteristics in Children Using Cochlear Implant: A Comparison With Normal Hearing Peers

2021 ◽  
Vol 17 (5) ◽  
pp. 393-399
Author(s):  
Abishek Umashankar ◽  
◽  
Subhashini Dhandayutham ◽  
Santhoshi Ramamoorthy ◽  
Jasmine Lydia Selvaraj ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Normal Hearing ◽  
Frequency Characteristics

scholarly journals Postural control during dual task in adolescent cochlear implant users under on/off-device conditions

2021 ◽  
Author(s):  
Zahra Nadimi ◽  
Mansoureh Adel Ghahraman ◽  
Ghassem Mohammadkhani ◽  
Reza Hoseinabadi ◽  
Shohreh Jalaie ◽  
...  
Keyword(s):  
Postural Control ◽  
Cochlear Implant ◽  
Vestibular System ◽  
Dual Task ◽  
Cognitive Task ◽  
Normal Hearing ◽  
Hearing Impaired ◽  
Caloric Test ◽  
Vestibular Disorders ◽  
Control Performance

Background and Aim: Vestibular system has several anatomical connections with cognitive regions of the brain. Vestibular disorders have negative effects on cognitive performance. Hearing-impaired patients, particularly cochlear implant users, have concomitant vestibular disor­ders. Previous studies have shown that attention assigned to postural control decreases while per­forming a cognitive task (dual task) in hearing-impaired children. Since the vestibular system and postural control performance develop around 15−16 years of age, the aim of this study was to compare postural control performance during dual task in adolescent boys with normal hearing and cochlear implant (CI) users with congenital hearing-impairment. Methods: Postural control was assessed in twenty 16−19 year old cochlear implant boys and 40 normal hearing peers with force plate. The main outcomes were displacement in posterior- anterior and medial-lateral planes, and mean speed with and without cognitive task and under on/off-device conditions. Caloric test was per­formed for CI users in order to examine the peri­pheral vestibular system. Results: Ninety-five percent of CI users showed caloric weakness. There were no significant diff­erences in postural control parameters between groups. All performances deteriorated in the foam pad condition compared to the hard surface in all groups. Total mean velocity significantly increased during dual task in normal hearing group and in CI users with off-device. Conclusion: Although CI users had apparent vestibular disorders, their postural control in both single and dual-task conditions was identical to the normal peers. These effects can be attributed to the vestibular compensation that takes place during growing. Keywords: Balance; postural control; dual task; congenital hearing loss; cochlear implant

scholarly journals Comparison of the high-frequency morpho-syntactic structures of cochlear implant children and children with normal hearing aged 4-6 years

2020 ◽  
Vol 22 (1) ◽  
pp. 85-91
Author(s):  
Seyedeh Sepideh seyedhosseini ◽  
Fatemeh Aqayi ◽  
Shima Rahmani ◽  
Toktam Maleki Shahmahmood ◽  
Fatemeh Haresabadi ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
High Frequency ◽  
Normal Hearing ◽  
Syntactic Structures
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