Monthly Archives: January 2011
Clinical evaluation of a new hearing aid anti-cardioid directivity pattern
Objective: The purpose of this research was to evaluate a new directional hearing aid algorithm which automatically adapts to an anti-cardioid pattern in background noise when a speech signal originates from behind the hearing aid user. Design: Using the hearing-in-noise-test (HINT) in the soundfield, with the sentences delivered adaptively from the back (180°) and the standard HINT competing noise from the front (0°; 72 dB SPL), the participants were tested for three different hearing aid conditions: omnidirectional, conventional adaptive directional, and adaptive directional with the anti-cardioid algorithm enabled. Study Sample: Adults (n = 21) with bilaterally symmetrical downward sloping sensorineural hearing loss; experienced hearing aid users and aided bilaterally for experimental testing. Results: Results revealed a significant effect for the hearing aid microphone setting (p < .0001), with a HINT mean RTS of 4.2 dB for conventional adaptive directional, −0.1 dB for omnidirectional, and −5.7 dB when the anti-cardioid algorithm was active. This was a large effect size (Cohen's f2). Conclusion: The findings suggest that the signal classification system steered the algorithm correctly, and that when implemented, the anti-cardioid polar pattern resulted in an improvement in speech recognition in background noise for this listening situation.
from the International Journal of Audiology
Cross-cultural adaptation and validation of the Chinese Abbreviated Profile of Hearing Aid Benefit
Objective: The objective of the study was to investigate the cross-cultural validity and reliability of the Chinese version of the Abbreviated Profile of the Hearing Aid Benefit questionnaire (APHAB-CH). Design: A convenience sampling method was used to identify and recruit subjects. The subjects completed a history form seeking demographic data, the APHAB-CH, and a questionnaire seeking a subjective rating of hearing aid performance and overall satisfaction with their hearing aid. Study sample: The subjects were 134 experienced hearing aid users. Results: The APHAB-CH had a good internal consistency reliability estimate (α = 0.85) comparable to that of the original version. Significant correlation was observed between the APHAB-CH scores and other subjective ratings for hearing aid performance and the overall satisfaction measure. A high test-retest reliability (intraclass correlation coefficient = 0.84) was observed. Confirmatory factor analysis revealed that the APHAB-CH had a two-factor structure comprising “hearing disability” and “averviseness.” Normative data in terms of equal-percentile profiles were dervied for the APHAB-CH. Conclusion: The results suggest that the APHAB-CH is a reliable and valid measure of the outcomes of hearing aid fitting
Read More: http://informahealthcare.com/doi/abs/10.3109/14992027.2010.550067
from the International Journal of Audiology
Quality of life for individuals with hearing impairment who have not consulted for services and their significant others: Same- and different-sex couples
The purpose of this exploratory study was to assess perceptions of quality of life for individuals with hearing impairment who have not consulted for services and their significant others who are in same-sex relationships vs. those who are in different-sex relationships. Data were collected on a total of 20 older couples: 10 in same-sex relationships and 10 in different-sex relationships. In each of the couples, one member self-identified as having hearing impairment. The couples completed an audiologic evaluation, a disease-specific quality of life questionnaire, and a short, structured interview (which served as a general measure of quality of life). No differences between the groups were found on demographic or audiologic variables. Differences between the groups and within the couples were found on the disease-specific and overall quality of life measures. Participants with hearing impairment in different-sex relationships reported significantly more total consequences of hearing impairment than those in the same-sex relationships. Differences were found in the rate of reporting for various contributors to overall quality of life and consequences of hearing impairment on quality of life. There was more congruity between same-sex couples than different-sex couples. There appear to be important differences in perceptions of both disease-specific and overall quality of life based on sexual orientation for older couples who have not consulted for hearing services. These differences can help inform clinical practice with this under-researched population.
from the Journal of Communication Disorders
Outcomes of surgery for laryngotracheal stenosis—The parents perspective
This study has given us a unique insight into the concerns of parents who have children with laryngotracheal stenosis. It has also allowed us to evaluate our post-operative results from a qualitative perspective through the eyes of the parents.
from the International Journal of Pediatric Otorhinolaryngology
Outcomes of surgery for laryngotracheal stenosis—The parents perspective
This study has given us a unique insight into the concerns of parents who have children with laryngotracheal stenosis. It has also allowed us to evaluate our post-operative results from a qualitative perspective through the eyes of the parents.
from the International Journal of Pediatric Otorhinolaryngology
Phonological learning in semantic dementia
Patients with semantic dementia (SD) have anterior temporal lobe (ATL) atrophy that gives rise to a highly selective deterioration of semantic knowledge. Despite pronounced anomia and poor comprehension of words and pictures, SD patients have well-formed, fluent speech and normal digit span. Given the intimate connection between phonological STM and word learning revealed by both neuropsychological and developmental studies, SD patients might be expected to show good acquisition of new phonological forms, even though their ability to map these onto meanings is impaired. In contradiction of these predictions, a limited amount of previous research has found poor learning of new phonological forms in SD. In a series of experiments, we examined whether SD patient, GE, could learn novel phonological sequences and, if so, under which circumstances. GE showed normal benefits of phonological knowledge in STM (i.e., normal phonotactic frequency and phonological similarity effects) but reduced support from semantic memory (i.e., poor immediate serial recall for semantically degraded words, characterised by frequent item errors). Next, we demonstrated normal learning of serial order information for repeated lists of single-digit number words using the Hebb paradigm: these items were well-understood allowing them to be repeated without frequent item errors. In contrast, patient GE showed little learning of nonsense syllable sequences using the same Hebb paradigm. Detailed analysis revealed that both GE and the controls showed a tendency to learn their own errors as opposed to the target items. Finally, we showed normal learning of phonological sequences for GE when he was prevented from repeating his errors. These findings confirm that the ATL atrophy in SD disrupts phonological processing for semantically-degraded words but leaves the phonological architecture intact. Consequently, when item errors are minimised, phonological STM can support the acquisition of new phoneme sequences in patients with SD.
from Neuropsychologia
Impairments in speech and nonspeech sound categorization in children with dyslexia are driven by temporal processing difficulties
Auditory processing problems in persons with dyslexia are still subject to debate, and one central issue concerns the specific nature of the deficit. In particular, it is questioned whether the deficit is specific to speech and/or specific to temporal processing. To resolve this issue, a categorical perception identification task was administered in thirteen 11-year old dyslexic readers and 25 matched normal readers using 4 sound continua: (1) a speech contrast exploiting temporal cues (/bA/-/dA/), (2) a speech contrast defined by nontemporal spectral cues (/u/-/y/), (3) a nonspeech temporal contrast (spectrally rotated/bA/-/da/), and (4) a nonspeech nontemporal contrast (spectrally rotated/u/-/y/). Results indicate that children with dyslexia are less consistent in classifying speech and nonspeech sounds on the basis of rapidly changing (i.e., temporal) information whereas they are unimpaired in steady-state speech and nonspeech sounds. The deficit is thus restricted to categorizing sounds on the basis of temporal cues and is independent of the speech status of the stimuli. The finding of a temporal-specific but not speech-specific deficit in children with dyslexia is in line with findings obtained in adults using the same paradigm (Vandermosten et al., 2010, Proceedings of the National Academy of Sciences of the United States of America, 107: 10389–10394). Comparison of the child and adult data indicates that the consistency of categorization considerably improves between late childhood and adulthood, particularly for the continua with temporal cues. Dyslexic and normal readers show a similar developmental progress with the dyslexic readers lagging behind both in late childhood and in adulthood.
Assessing Phonemic Awareness in Preschool and Kindergarten: Development and Initial Validation of First Sound Fluency
This article presents initial findings from a study examining First Sound Fluency (FSF), which is a brief measure of early phonemic awareness (PA) skills. Students in prekindergarten and kindergarten (preK and K) were assessed three times (fall, winter, and spring) over one school year, which resulted in multiple reliability and validity coefficients. In addition, a subset of students in both preK and K was assessed monthly between benchmark periods using alternate forms of the FSF measure to estimate delayed alternate-form reliability. The FSF measure displayed adequate reliability and validity for decision making in early literacy for students in both grades. Implications of these findings are discussed.
Dental and craniofacial characteristics in a patient with Dubowitz syndrome: a case report
The main method of diagnosis is through identification of facial phenotype. Differential diagnosis can be made with Bloom syndrome, Smith-Lemli-Optiz Syndrome and Fetal alcohol syndrome. As there are few reports of this syndrome in the literature the authors have endeavored to enable health professionals to recognize the phenotypic alterations of this syndrome, and consequently refer such patients for the necessary multidisciplinary treatments.
from the Journal of Medical Case Reports
Neural Processing of What and Who Information during Spoken Language Processing
Human speech is composed of two types of information, related to content (lexical information, i.e., “what” is being said, e.g., words) and to the speaker (indexical information, i.e., “who” is talking, e.g., voices). The extent to which lexical versus indexical information is represented separately or integrally in the brain is unresolved. In the current experiment, we use short-term fMRI adaptation to address this issue. Participants performed a loudness judgment task during which single or multiple sets of words/pseudowords were repeated with single (repeat) or multiple talkers (speaker-change) conditions while BOLD responses were collected. As reflected by adaptation fMRI, the left posterior middle temporal gyrus, a crucial component of the ventral auditory stream performing sound-to-meaning computations (“what” pathway), showed sensitivity to lexical as well as indexical information. Previous studies have suggested that speaker information is abstracted during this stage of auditory word processing. Here, we demonstrate that indexical information is strongly coupled with word information. These findings are consistent with a plethora of behavioral results that have demonstrated that changes to speaker-related information can influence lexical processing.
from the Journal of Cognitive Neuroscience
The effects of hypertext glosses on L2 vocabulary acquisition: a meta-analysis
This study examines (1) the effects of hypertext gloss use on L2 vocabulary acquisition in computerized reading contexts; (2) which specific combination of either text-only (single) or text + visual (multiple) hypertext glosses is more effective on L2 vocabulary acquisition; and (3) potential moderators to systematically account for between study variation. In addition, it aims to synthesize characteristics of studies, technology use, and research methods from empirical research studies for a comprehensible and insightful review of the effect of hypertext glosses on L2 vocabulary acquisition. Meta-analysis was conducted to synthesize overall findings of empirical studies by calculating a standardized mean difference effect size. On the basis of 35 weighted mean effect sizes, the magnitude of text + visual (multiple) hypertext gloss combination was moderately effective on L2 vocabulary acquisition when L2 learners were given two conditions: text-only and text + visual hypertext glosses. The results revealed that studies with large samples (Mes = 0.43) provided a bigger effect size. In addition, the variable of learner proficiency was found statistically significant: the impact of multiple hypertext glosses was likely more on L2 vocabulary acquisition of beginning learners. Test type formats were also found as a significant factor across the studies.
Comparing the Effects of Rehabilitation Swallowing Therapy vs. Functional Neuromuscular Electrical Stimulation Therapy in an Encephalitis Patient: A Case Study
A 49-year-old man with pharyngeal dysphagia after encephalitis is presented in this case study. Sixteen months earlier the patient experienced a sudden severe fever which resulted in encephalitis, leading to liquid dysphagia. Despite receiving an initial treatment of swallowing therapy, the patient’s liquid dysphagia did not improve. Functional neuromuscular electrical stimulation, which is a new treatment method, was then applied to the patient. The patient showed improvement in the pharyngeal phase of swallowing. Clinical and treatment observations are reported.
from Dysphagia
Kinematic Analysis of Dysphagia: Significant Parameters of Aspiration Related to Bolus Viscosity
The purpose of this study was to investigate the mechanisms of aspiration with respect to the viscosity of ingested material in patients with dysphagia. Seventy patients with dysphagia underwent videofluoroscopic swallow studies (VFSS) between May 1, 2009 and September 30, 2009. Based on the findings of the VFSS, patients were divided into three groups: a thick-fluid aspiration group, a thin-fluid aspiration group, and a no-aspiration group. Kinematic analyses were performed during thick-fluid swallowing. Among our 70 patients, 23 had thick-fluid aspiration, 20 had thin-fluid aspiration, and 27 had no aspiration. A shortened duration of upper esophageal sphincter (UES) opening, a shorter interval between UES opening and peak pharyngeal constriction, and a diminished extent of laryngeal elevation were all significant risk factors for thick-fluid aspiration. A prolonged latency of the swallowing reflex, pharyngeal transit time, and the interval between bolus arrival at the vallecula and laryngeal elevation were all significant risk factors for thin-fluid aspiration. Our kinematic analysis of dysphagia employing the VFSS indicated that the mechanisms relevant to aspiration differed with respect to food viscosity.
from Dysphagia
