scholarly journals A Site-Selection Strategy Based on Polarity Sensitivity for Cochlear Implants: Effects on Spectro-Temporal Resolution and Speech Perception

2019 ◽  
Vol 20 (4) ◽  
pp. 431-448 ◽  
Author(s):  
Tobias Goehring ◽  
Alan Archer-Boyd ◽  
John M. Deeks ◽  
Julie G. Arenberg ◽  
Robert P. Carlyon
Keyword(s):  
Speech Perception ◽  
Cochlear Implants ◽  
Temporal Resolution ◽  
Site Selection ◽  
Selection Strategy ◽  
Polarity Sensitivity ◽  
A Site

scholarly journals A Site-Selection Strategy based on Polarity Sensitivity for Cochlear Implants: Effects on Spectro-Temporal Resolution and Speech Perception

2019 ◽  
Author(s):  
Tobias Goehring ◽  
Alan Archer-Boyd ◽  
John M. Deeks ◽  
Julie G. Arenberg ◽  
Robert P. Carlyon
Keyword(s):  
Speech Perception ◽  
Temporal Resolution ◽  
Site Selection ◽  
Dynamic Range ◽  
High Amplitude ◽  
Selection Strategy ◽  
Noise Performance ◽  
Large Variability ◽  
Processing Strategies ◽  
A Site

Thresholds of asymmetric pulses presented to cochlear implant (CI) listeners depend on polarity in a way that differs across subjects and electrodes. It has been suggested that lower thresholds for cathodic-dominant compared to anodic-dominant pulses reflect good local neural survival. We evaluated the hypothesis that this polarity effect (PE) can be used in a site-selection strategy so as to improve speech perception and spectro-temporal resolution. Detection thresholds were measured in 8 users of Advanced Bionics CIs for 80-pps, tri-phasic, monopolar pulse trains where the central high-amplitude phase was either anodic or cathodic. Two experimental MAPs were then generated for each subject by deactivating the five electrodes with either the highest or the lowest PE magnitudes (cathodic minus anodic threshold). Performance with the two experimental MAPs was evaluated using two spectro-temporal tests (STRIPES, Archer-Boyd et al., 2018; and SMRT, Aronoff and Landsberger, 2013), and with speech recognition in quiet and in noise. Performance was also measured with an experimental MAP that used all electrodes, similar to the subjects’ clinical MAP. The PE varied strongly across subjects and electrodes, with substantial magnitudes relative to the electrical dynamic range. There were no significant differences in performance between the three MAPs at group level, but there were significant effects at subject level - consistent with previous reports of a large variability in CI users’ performance, and in the potential benefit of site-selection strategies. The STRIPES but not the SMRT test successfully predicted which strategy produced the best speech-in-noise performance on a subject-by-subject basis. The average PE across electrodes correlated significantly with subject age, duration of deafness and speech perception scores, consistent with a relationship between PE and neural health. These findings motivate further investigations into site-specific measures of neural health and their application to CI processing strategies.

Waste disposal site selection techniques in Quaternary terraine Ontario, Canada

1991 ◽  
Vol 7 (1) ◽  
pp. 211-217
Author(s):  
A. J. Cooper
Keyword(s):  
Site Selection ◽  
Waste Treatment ◽  
Careful Analysis ◽  
Quaternary Geology ◽  
Disposal Site ◽  
Geological Investigation ◽  
Fine Grained ◽  
Clayey Silt ◽  
Treatment And Disposal ◽  
A Site

AbstractThick and predictable deposits of fine grained Quaternary materials have been used for the siting of waste management facilities in Ontario. The search for such sites is founded on the application of techniques in Quaternary geology and hydrogeology. Two examples are presented. Oxford County is located southwest of Toronto in an area of parallel morainic ridges separated by flat till plains. Conventional wisdom would focus on the till plains for thick, consistent fine grained Quaternary Sediments. However, the careful analysis of the Quaternary stratigraphy and glacial history revealed that better sites are located along the moraines. A site on the Ingersoll Moraine was studied in detail and defended at a public hearing. Concerns about the geology of the materials were allayed by the confirmation of homogeneous clayey silt materials exposed when the site opened in late 1986. A much wider ranging search was undertaken for a major hazardous and liquid industrial waste treatment and disposal facility for the Province of Ontario. Progressively more detailed investigations of the Quaternary geology were used to assist a multi-disciplinary site selection team. Initial interpretations covered an area of 75 000 km2 at a scale of 1:250 000. Eight candidate sites were then selected for further investigation with five continuously sampled stratigraphic boreholes. The chosen site is located in a depression in the bedrock filled with 40 m of glaciolacustrine clayey silt. Site specific hydrogeological and geotechnical studies were integrated with a detailed geological investigation.

Speech Perception and Localization With Adults With Bilateral Sequential Cochlear Implants

2007 ◽  
Vol 28 (Supplement) ◽  
pp. 86S-90S ◽  
Author(s):  
Richard S. Tyler ◽  
Camille C. Dunn ◽  
Shelley A. Witt ◽  
William G. Noble
Keyword(s):  
Speech Perception ◽  
Cochlear Implants

scholarly journals Auditory Speech Perception Development in Relation to Patient's Age with Cochlear Implant

2016 ◽  
Vol 21 (03) ◽  
pp. 206-212 ◽  
Author(s):  
Grace Ciscare ◽  
Erika Mantello ◽  
Carla Fortunato-Queiroz ◽  
Miguel Hyppolito ◽  
Ana Reis
Keyword(s):  
Speech Perception ◽  
Cochlear Implant ◽  
Cochlear Implants ◽  
Statistical Difference ◽  
Hearing Aid ◽  
Age Groups ◽  
Auditory Thresholds ◽  
Caregiver Education ◽  
Auditory Speech ◽  
Hearing Aid Use

Introduction A cochlear implant in adolescent patients with pre-lingual deafness is still a debatable issue. Objective The objective of this study is to analyze and compare the development of auditory speech perception in children with pre-lingual auditory impairment submitted to cochlear implant, in different age groups in the first year after implantation. Method This is a retrospective study, documentary research, in which we analyzed 78 reports of children with severe bilateral sensorineural hearing loss, unilateral cochlear implant users of both sexes. They were divided into three groups: G1, 22 infants aged less than 42 months; G2, 28 infants aged between 43 to 83 months; and G3, 28 older than 84 months. We collected medical record data to characterize the patients, auditory thresholds with cochlear implants, assessment of speech perception, and auditory skills. Results There was no statistical difference in the association of the results among groups G1, G2, and G3 with sex, caregiver education level, city of residence, and speech perception level. There was a moderate correlation between age and hearing aid use time, age and cochlear implants use time. There was a strong correlation between age and the age cochlear implants was performed, hearing aid use time and age CI was performed. Conclusion There was no statistical difference in the speech perception in relation to the patient's age when cochlear implant was performed. There were statistically significant differences for the variables of auditory deprivation time between G3 - G1 and G2 - G1 and hearing aid use time between G3 - G2 and G3 - G1.

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