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Biomedical subjects

N Tye-Murray

Publications and source records attributed to N Tye-Murray.

At least 19 recordsLinked to original sources

Reported use of communication strategies by SHHH members: client, talker, and situational variables.

Two hundred and twelve members of the Self Help for Hard of Hearing People (SHHH) organization completed a survey that evaluated their use of communication strategies. Reported use of strategies was correlated with attitudinal variables and social-interaction indices. On average, subjects agreed most strongly with questionnaire items stating they would ask a talker to repeat a misperceived utterance. They agreed less strongly with items stating they would ask the talker to restructure or elaborate an utterance. Subjects agreed strongly that they would use the communication strategies with familiar talkers, and less strongly that they would use them with unfamiliar talkers. Subjects who appeared less likely to say nothing after misperceiving an utterance were more likely to disagree that they were frustrated with their speechreading skills, and they appeared less likely to avoid social interactions. Subjects who indicated a greater likelihood of using anticipatory strategies, such as reviewing potential vocabulary before an appointment, were on average more likely to avoid social interactions. They also agreed more strongly that poor speechreaders appear less intelligent.

Adult

Performance over time with a nucleus or Ineraid cochlear implant.

This investigation determined whether the audiological performance of cochlear implant users varied with experience. Thirteen Nucleus and 14 Ineraid subjects were evaluated at 1, 9, and 18 mo after cochlear implant connection. Ten Nucleus and five Ineraid subjects were tested at 30 mo. On average, the ability of the subjects to recognize words and phonemes in an audition-only condition improved during the first 9 mo, as did their ability to recognize spondees in noise. The phoneme scores continued to improve during the next 9 mo. Environmental sound recognition improved gradually; significant improvement from the 1 mo scores was not noted until 18 mo. About half of the subjects who demonstrated poor word recognition at 1 mo showed significantly improved percent word correct scores by 18 mo. The Nucleus and Ineraid subjects did not differ in their patterns of change over time. An information transmission analysis performed on the subjects' consonant confusion matrices showed relatively little change for the nasality and place features during the first 18 mo, and relatively large change for the voice, duration, and frication features. Most improvement in the feature scores occurred during the first 9 mo.

Cochlear Implants

Young cochlear implant users' response to delayed auditory feedback.

This investigation determined whether the signal provided by the Cochlear Corporation Nucleus cochlear implant can convey enough speech information to induce a response to delayed auditory feedback (DAF), and whether prelingually deafened children who received a cochlear implant relatively late in their speech development are susceptible. Ten children with the Nucleus cochlear implant spoke simple phrases, first without and then with DAF. Three prelingually deafened subjects and the only two postlingually deafened subjects demonstrated longer phrase durations when speaking with DAF than without it. Two of the prelingually deafened subjects who demonstrated a response received their cochlear implants at the age of 5 years.

Attention

The use of static and dynamic vowel cues by multichannel cochlear implant users.

Multichannel cochlear implant users vary greatly in their word-recognition abilities. This study examined whether their word recognition was related to the use of either highly dynamic or relatively steady-state vowel cues contained in /bVb/ and /wVb/ syllables. Nine conditions were created containing different combinations of formant transition, steady-state, and duration cues. Because processor strategies differ, the ability to perceive static and dynamic information may depend on the type of cochlear implant used. Ten Nucleus and ten Ineraid subjects participated, along with 12 normal-hearing control subjects. Vowel identification did not differ between implanted groups, but both were significantly poorer at identifying vowels than the normal-hearing group. Vowel identification was best when at least two kinds of cues were available. Using only one type of cue, performance was better with excised vowels containing steady-state formants than in "vowelless" syllables, where the center vocalic portion was deleted and transitions were joined. In the latter syllable type, Nucleus subjects identified vowels significantly better when /b/ was the initial consonant; the other two groups were not affected by specific consonantal context. Cochlear implant subjects' word-recognition was positively correlated with the use of dynamic vowel cues, but not with steady-state cues.

Adult

Preparing for communication interactions: the value of anticipatory strategies for adults with hearing impairment.

Some people with hearing impairment may use anticipatory strategies to prepare for an upcoming communication interaction, such as a doctor's appointment. They may consider vocabulary and statements that might occur, and they may practice speechreading a partner saying the items. Experiment 1 evaluated the effectiveness of two types of anticipatory strategies: workbook activities and situation-specific lipreading practice. Two groups of normal-hearing subjects were asked to prepare for a communication interaction in a bank setting where they would be required to recognize speech using only the visual signal. Each group was assigned to one type of anticipatory strategy. A third group served as a control group. Experiment 2 evaluated whether multifaceted anticipatory practice improved cochlear implant users' ability to recognize statements and words audiovisually that might occur in a doctor's office, bank, movie theater, and gas station. One group of implanted subjects received 4 days of training, 1 day for each setting, and a second group served as a control group. In both experiments, subjects who used anticipatory strategies did not improve their performance on situation-specific sentence tests more than the control subjects.

Cochlear Implants

The establishment of open articulatory postures by deaf and hearing talkers.

Previous researchers have proposed that prelingually deafened talkers do not displace the tongue body to establish vowel steady-state postures and displace the jaw excessively. The purpose of this investigation was to evaluate the opening gesture lingual displacement patterns of three deaf and two hearing adult talkers. Cinefluorography and x-ray microbeam data indicated that the deaf subjects displaced their tongue bodies during the opening gestures. However, their glossal movement trajectories were qualitatively dissimilar to those of the hearing subjects. Whereas the hearing subjects moved the tongue differently for different vowel contexts, the deaf subjects had similar trajectories for all contexts. The common trajectories suggest that some deaf talkers contract their tongue muscles such that the tongue body moves similarly for all vowels. The deaf subjects also appeared to have a less flexible tongue body during speech production than the hearing subjects. Means for quantifying and comparing the lingual behaviors of deaf and hearing talkers are considered.

Adult

Scaling and transcription measures of intelligibility for populations with disordered speech.

Although Samar and Metz (1988) have addressed significant issues regarding the assessment of the intelligibility of hearing-impaired talkers, we cannot agree with their interpretation of their findings. Because the transcription and rating-scale measures were performed on different types of speech samples, the two sets of scores cannot be compared. Moreover, transcription and scaling measures may provide fundamentally different estimates of speech performance. Investigators should select which measure to use after considering the appropriate construct validity and the purpose of the measurement.

Hearing Disorders

Repair strategy usage by hearing-impaired adults and changes following communication therapy.

This investigation documented how hearing-impaired individuals use communication repair strategies in structured settings and determined whether these strategies could be changed by communication therapy. Eight hearing-impaired adults with mild to severe sensorineural hearing losses practiced using five repair strategies when they did not correctly speechread a videotaped sentence. The strategies included asking the talker to (a) repeat the sentence, (b) simplify it, (c) rephrase it, (d) say an important key word, and (e) speak two sentences. Therapy consisted of computerized interactive activities and role-playing with a clinician. Seven hearing-impaired adults served as control subjects and received no therapy. Before and during therapy, subjects usually wanted a misperceived sentence to be repeated. On average, subjects changed their use of repair strategies following therapy. They utilized the repeat strategy less often and other strategies more often.

Adult

Aural rehabilitation.

Aural rehabilitation involves a complete evaluation of the communication deficits and needs of the hearing-impaired patient as well as the provision of counselling and therapy. This article describes listening-assistive devices, speech production, and audiovisual training. Issues related to educational placement and tinnitus also are reviewed.

Cochlear Implants

Effects of repair strategies on visual identification of sentences.

This investigation determined whether information elicited by repair strategies enhances an individual's ability to lipread a misperceived sentence. Five groups of subjects were each assigned one of five repair strategies: (a) asking the talker to repeat a sentence, (b) simplify it, (c) rephrase it, (d) say an important keyword, and (e) speak two sentences. Subjects viewed sentences spoken by six different talkers. When a subject did not recite a sentence verbatim, the talker performed the assigned repair strategy and then repeated the original sentence. A control group of subjects saw only the original sentence repeated twice. All five test groups demonstrated a significantly greater improvement for the second presentation score (referenced to the first presentation score) than the control group. The benefits provided by the repair strategies were independent of the talker, and benefits did not differ significantly among the groups.

Adult

Comparison of the F0F2 and F0F1F2 processing strategies for the Cochlear Corporation cochlear implant.

In April 1985, an updated processing strategy became available for the Cochlear Corporation Nucleus cochlear implant. Whereas the original strategy codes only fundamental frequency, amplitude, and information in the second formant region, the newer strategy also codes frequencies in the first formant region. This investigation evaluated the speech recognition skills of five subjects who were experienced with both designs. On average, the addition of first formant information improved word identification in an audition-only condition and improved spondee recognition in noise. Scores for the NU 6 Monosyllabic Word Test and the Sentence Test Without Context improved from 8% (2-12%) to 28% words correct (10-42%), and from 31% (10-45%) to 64% words correct (39-84%), respectively. Scores for the Four-Choice Spondee Test in noise improved from 37% (25-50%) to 75% (45-90%). The percent correct scores for the Iowa 14-Item Consonant Confusion Test in an audition-only and vision-plus-audition condition did not vary with the change in processing strategy. However, an information transfer analysis performed on the responses to the consonant test in a vision-only and a vision-plus-audition condition suggested that the newer strategy enhances the transmission of the voicing, duration, and envelope features.

Adult

Jaw and lip movements of deaf talkers producing utterances with known stress patterns.

This investigation determined whether prelingually deaf talkers could correctly produce stressed and unstressed syllables across known changes in stress patterning and phonetic composition. Three deaf and three hearing adults spoke sets of homogeneous syllable strings with stress patterns that they could tap successfully with a finger. Strain gauge transduction of lower lip and jaw movement indicated that both deaf and hearing subjects produced different displacements and durations for the stressed and unstressed syllables, regardless of the stress pattern. Jaw movement did not become more variable with changes in phonetic composition of the syllables. The results show no evidence that motoric abilities (as assessed in lip and jaw movements) limit deaf talkers in producing desired stress patterns.

Adult

Alternating current at the eardrum for tinnitus reduction.

The effectiveness of alternating current (AC) stimulus on tinnitus was investigated in 10 patients who reported constant tinnitus in at least one ear. Patients were first screened to determine their responsiveness to electrical stimulation in relation to tinnitus reduction. The responsive patients were then stimulated for a treatment period of at least 10 min, during which time the tinnitus was measured. The AC stimuli (62 Hz to 8000 Hz) were applied to the eardrum of the patients via a specially constructed electrode. Psychophysical measurements (pitch matching, loudness matching, minimum masking level, and loudness and annoyance scaling) of the patient's tinnitus were made before and after electrical stimulation. Minimal masking level was determined and tinnitus scaling was performed during the treatment period. Electrical stimulation was effective in tinnitus reduction in 5 of the 10 patients. These 5 patients reported that the loudness and the annoyance of their tinnitus decreased during the treatment period. These observations were consistent with psychophysical measures of contralateral broadband noise masking. Poststimulation reduction in tinnitus varied in duration among individuals from 40 s to about 4 hr.

Adult

Auditory consonant and word recognition skills of cochlear implant users.

Auditory consonant recognition and sentence recognition tests were administered to two subjects wearing the 3M/House cochlear implant, three subjects wearing the 3M/Vienna implant, seven subjects wearing the Cochlear Corporation (Nucleus) implant and 10 subjects wearing the Symbion implant. For the 14-item consonant test, the Symbion subjects scored an average of 41% consonants correct (17-58%), the Cochlear Corporation subjects scored an average of 34% (25-48%), the 3M/Vienna subjects scored 19% (15-26%), and the 3M/House subjects scored 11% (7-14%). An information transfer analysis performed on the consonant data suggested that subjects perceive the envelope feature relatively well and the place feature relatively poorly. All of the 3M/House and 3M/Vienna subjects scored 0% words correct for the sentence test. The Symbion and Cochlear Corporation subjects scored an average of 35% (0-92%) and 32% (9-45%) words correct, respectively. To better understand the variability in word recognition skills, the scores from the sentence test were correlated with the results of the information transfer analysis. The voicing and duration features did not correlate with the sentence scores very well. Place and frication features were shown to be most predictive of auditory word recognition. This finding suggests that subjects who utilize middle and high-frequency speech information are more likely to score better on open-set word recognition tests than subjects who do not.

Cochlear Implants

The influence of final-syllable position on the vowel and word duration of deaf talkers.

Hearing talkers produce shorter vowel and word durations in multisyllabic contexts than in monosyllabic contexts. This investigation determined whether a similar effect occurs for deaf talkers, a population often characterized as lacking coarticulation in their speech. Four prelingually deafened adults and two hearing controls produced three sets of word sequences. Each set included a kernel word and six derived forms (e.g., "speed," "speedy," "speeding," etc.). The derived forms were created by adding unstressed and stressed syllables to the kernel form. A spectrographic analysis indicated that the deaf subjects did not always decrease word and vowel durations for the derivatives. Unlike hearing speakers, they often did not reduce vowel segments more than consonant segments. Three explanations are forwarded for the shortening effects. One relates to the implementation of temporal rules, the second concerns the organization imposed upon the articulators to produce speech, and the third suggests a language-independent vocal tract characteristic. The role of auditory information in developing the shortening effects is also considered.

Adult

The recognition of vowels differing by a single formant by cochlear-implant subjects.

The ability to recognize synthetic, two-formant vowels with equal duration and similar loudness was measured in five subjects with the Cochlear and five subjects with the Symbion cochlear implants. In one set of test stimuli, vowel pairs differed only in the first-formant frequency (F1). In another set, vowel pairs differed only in the second-formant frequency (F2). When F1 differed, four of five Cochlear subjects and four of five Symbion subjects recognized the vowels significantly above chance. When F2 differed, two of five Cochlear subjects and three of five Symbion subjects scored above chance. These results suggest that implanted subjects can utilize both "place" information across different electrodes and "rate" information on a single electrode to derive information about the spectral content of the stimulus.

Adult

Synthetic two-formant vowel perception by some of the better cochlear-implant patients.

Synthetic two-formant vowel recognition was tested in some of the better cochlear-implant users to determine their ability to resolve sounds that differ essentially in their frequency content. The vowels /i, epsilon, alpha, u/ were synthesized with equal duration and similar sound pressure level. The formant values were chosen to approximate the values of these vowels in French, German and American English. Performance ranged from 29 to 71% for the 6 patients with the Chorimac implant, from 25 to 67% for the 9 patients with the 3M/Vienna implant, from 63 to 92% for the 10 patients with the Nucleus implant from Hannover, from 17 to 79% for the 10 patients with the Duren/Cologne implant, from 54 to 100% for the 9 patients with the Symbion implant, and from 79 to 100% for the 10 Nucleus patients from the USA. Patients with each of these devices can utilize some spectral information when recognizing steady-state vowels.

Cochlear Implants