Effects of Schema-Enriched Communication in Teams With Diverse Hearing Status.

This study examined the effects of (a) schema-enriched communication and (b) computer-based messaging on the sharing of knowledge and problem solving in teams with deaf or hard of hearing (DHH) and typical hearing (TH) postsecondary students. Four-member teams comprising either all DHH, all TH, or two DHH and two TH postsecondary students solved a complex problem. Measures consisted of (a) shared written information, (b) creation of a matrix with information for solving the problem, (c) recognition of information shared by team members, and (d) quality of the team's problem solution. A total of 126 DHH and 126 TH postsecondary students participated in the study in teams with one of the three combinations of hearing status. Enriched communication increased teams' sharing of written information, creation of a matrix, recognition of information shared by teammates and quality of the problem solution in teams.

Wind turbine low frequency and infrasound propagation and sound pressure level calculations at dwellings.

This study was developed to estimate wind turbine low frequency and infrasound levels at 1238 dwellings in Health Canada's Community Noise and Health Study. In field measurements, spectral peaks were identifiable for distances up to 10 km away from wind turbines at frequencies from 0.5 to 70 Hz. These measurements, combined with onsite meteorology, were in agreement with calculations using Parabolic Equation (PE) and Fast Field Program (FFP). Since onsite meteorology was not available for the Health Canada study, PE and FFP calculations used Harmonoise weather classes and field measurements of wind turbine infrasound to estimate yearly averaged sound pressure levels. For comparison, infrasound propagation was also estimated using ISO 9613-2 (1996) calculations for 63 Hz. In the Health Canada study, to a distance of 4.5 km, long term average FFP calculations were highly correlated with the ISO based calculations. This suggests that ISO 9613-2 (1996) could be an effective screening method. Both measurements and FFP calculations showed that beyond 1 km, ISO based calculations could underestimate sound pressure levels. FFP calculations would be recommended for large distances, when there are large numbers of wind turbines, or when investigating specific meteorological classes.

Deaf/hard-of-hearing and other postsecondary learners' retention of STEM content with tablet computer-based notes.

Four groups of postsecondary students, 25 who were deaf/hard of hearing (D/HH), 25 with a learning disability, 25 who were English language learners (ELLs), and 25 without an identified disability studied notes that included text and graphical information based on a physics or a marine biology lecture. The latter 3 groups were normally hearing. All groups had higher scores on post- than on pretests for each lecture, with each group showing generally similar gains in amount of material learned from the pretest to the posttest. For each lecture, the D/HH students scored lower on the pre- and posttests than the other 3 groups of participants. Results indicated that students acquired measurable amounts of information from studying these types of notes for relatively short periods and that the notes have equal potential to support the acquisition of information by each of these groups of students.

"Black People Like Me": A virtual conference series to engage underserved patients with asthma in patient centered outcomes research.

BACKGROUND: In response to racial inequity in asthma, asthma-related research among diverse patients is vital. However, people from historically marginalized groups are underrepresented in clinical and patient-centered outcomes research (PCOR). The "Black People Like Me" (BPLM) virtual conference series was developed to: (1) engage Black patients with asthma and their caregivers in education and discussions about asthma, and (2) encourage involvement in PCOR. Education about COVID-19 and COVID-19 vaccination was also incorporated. METHODS: The Project Advisory Group consisting of Black patients, clergy, physicians, and a program evaluator met monthly to develop BPLM. The program consisted of free one-hour virtual sessions held monthly for 6 months. BPLM was promoted through the Allergy & Asthma Network website, emails, social media, and personal contacts with a recruitment goal of ≥ 100 Black patients with asthma or caregivers. Program evaluations, interactive polling questions during each session, and participant pre- and post-session tests were conducted. RESULTS: Sessions averaged 658 participants including Black patients, family members, caregivers, Black clergy, health care providers, and other concerned community. Overall, 77% of participants strongly agreed with satisfaction with the sessions. Pre- and post-tests demonstrated that participants exhibited growth in knowledge regarding asthma risk, PCOR, and PCOR research opportunities for patients, exhibited preexisting and sustained knowledge regarding COVID-19 vaccination and side effects, and demonstrated an increased sense of empowerment during healthcare visits. CONCLUSIONS: BPLM demonstrated that a virtual platform can successfully engage Black communities. Incorporating clergy and religious organizations was critical in developing the trust of the Black community towards BPLM.

Opportunistic viral surveillance confirms the ongoing disease threat grey squirrels pose to sympatric red squirrel populations in the UK.

BACKGROUND: Red Squirrels United was a UK landscape-scale grey squirrel management programme undertaken between 2016 and 2020. METHODS: A total of 11034 grey squirrels were removed by culling, with 1506 necropsied and 1405 suitable for adenovirus (AdV) or squirrelpox virus (SQPV) quantitative PCR (qPCR) analysis. Spleen, lip or hair were extracted, and DNA was isolated, with samples tested in duplicate by qPCR. RESULTS: Of 1378 tissue samples, 43% were positive for AdV and 10% for SQPV. Of 1031 hair samples, 11% were positive for AdV and 10% for SQPV. Overall, 762 of 1405 (54%) animals were positive for one or both viruses. LIMITATIONS: Ad hoc sampling was undertaken from limited geographical areas but provided the only dataset from that period, instead of extrapolating from historical data. CONCLUSIONS: The grey squirrel is an asymptomatic reservoir host for AdV and SQPV. Interspecific infection transmission potential is demonstrated. Grey squirrel management by culling is essential for mainland red squirrel viability until other suitable management tools are available.

Effects of Messaging and Communication Strategy Training on Interaction in Teams With Deaf and Hearing College Students.

The study investigated effects of computer-based messaging and training in communication strategies on interactions of deaf and typically hearing (TH) teammates in completing decision-making tasks without interpreter support. Fifteen teams, two deaf and two TH college students each, completed three decision-making tasks, one without messaging, one with messaging, and one with messaging and training in communication strategies. Each interaction was coded for (a) communication method, (b) to whom the interaction was directed, and (c) the function of the interaction. Without messaging, teams used speech, sign, or paper and pencil; with messaging, they predominantly used this technology to communicate with each other. Without messaging, teammates directed communications to members of the same hearing status; with messaging, they directed communications to the whole team. Teammates made fewer communication repairs with messaging than without. In focus groups conducted after the decision-making tasks, participants noted messaging's limitations and benefits.

Social processes and outcomes of in-school contact between deaf and hearing peers.

Studies of social processes and outcomes of the placement of deaf students with hearing peers cannot be easily summarized, but can be grouped into a least four major categories of focus: social skills, interaction and participation, sociometric status and acceptance, and affective functioning. We review 33 studies available since 1980 in which a mainstreamed or included deaf sample was compared to another group. Studies indicated (1) that hearing students were more socially mature than deaf students in public schools, (2) that deaf students interacted with deaf classmates more than hearing ones, (3) that deaf students were somewhat accepted by their hearing classmates, and (4) that self-esteem was not related to extent of mainstreaming. There was a tendency for studies to use observational methods with very young children, teacher evaluations with middle school children, and questionnaires with older children. Three major areas of methodology limit general conclusions: samples, measurements of variables, and experimental manipulations. The reviewed studies provide a basis for understanding the social processes and outcomes in these placement situations; however, it is not possible to make broad generalizations about effects of placement.

Developing Membership in the Education of Deaf and Hard-of-Hearing Students in Inclusive Settings.

This article discusses the importance of membership in the inclusive education of deaf/hard-of-hearing (D/HH) students. Membership refers to being an integral part of the classroom and school communities. Membership is a key philosophical concept in inclusion that may influence how classroom teachers and teachers of D/HH students share their expertise and how they work with students and each other. Membership can be contrasted with "visitorship." When programs treat D/HH students as visitors, these students face greater barriers to obtaining a quality education in classes with hearing students. A social constructivist perspective of learning and teaching that requires students in the classroom to interact with one another and the teacher may best promote learning and is consistent with a focus on membership. We suggest that inclusion is possible, but to sustain students as full members of their classes and school, programs must go beyond placement and communication access issues. To facilitate membership, inclusive programs must carefully address teacher attitudes, teacher roles and relationships, student knowledge and curriculum, structural barriers, extracurricular activities, community relationships, and parental support.

Effects of expanded and standard captions on deaf college students' comprehension of educational videos.

Twenty-two college students who were deaf viewed one instructional video with standard captions and a second with expanded captions, in which key terms were expanded in the form of vocabulary definitions, labeled illustrations, or concept maps. The students performed better on a posttest after viewing either type of caption than on a pretest; however, there was no difference in comprehension between standard and expanded captions. Camtasia recording software enabled examination of the extent to which the students accessed the expanded captions. The students accessed less than 20% of the available expanded captions. Thus, one explanation for the lack of difference in comprehension between the standard and expanded captions is that the students did not access the expanded captions sufficiently. Despite limited use of the expanded captions, the students stated, when interviewed, that they considered these captions beneficial in learning from the instructional video.

Validity and reliability of the classroom participation questionnaire with deaf and hard of hearing students in public schools.

The Classroom Participation Questionnaire (CPQ) was administered to 136 deaf or hard of hearing (D/HH) students attending general education classrooms in Grades 4-10. The CPQ is a student-rated measure that yields scores for Understanding Teachers, Understanding Students, Positive Affect, and Negative Affect. Validity and reliability of a long (28-item) and a short (16-item) form are reported. We provide evidence of (a) internal structure validity through an examination of the relationships between the subscales and an analysis of interitem reliability within each scale, (b) reliability over time by examining the scores of students over a 3-year period, and (c) external structure validity through an examination of the relationships of the CPQ with measures of teacher-rated academic competence and Stanford achievement scores. The results suggest that both the long and short form of the CPQ can be used to assess participation of D/HH students in general education classrooms.

Benefits of sign language interpreting and text alternatives for deaf students' classroom learning.

Four experiments examined the utility of real-time text in supporting deaf students' learning from lectures in postsecondary (Experiments 1 and 2) and secondary classrooms (Experiments 3 and 4). Experiment 1 compared the effects on learning of sign language interpreting, real-time text (C-Print), and both. Real-time text alone led to significantly higher performance by deaf students than the other two conditions, but performance by deaf students in all conditions was significantly below that of hearing peers who saw lectures without any support services. Experiment 2 compared interpreting and two forms of real-time text, C-Print and Communication Access Real-Time Translation, at immediate testing and after a 1-week delay (with study notes). No significant differences among support services were obtained at either testing. Experiment 3 also failed to reveal significant effects at immediate or delayed testing in a comparison of real-time text, direct (signed) instruction, and both. Experiment 4 found no significant differences between interpreting and interpreting plus real-time text on the learning of either new words or the content of television programs. Alternative accounts of the observed pattern of results are considered, but it is concluded that neither sign language interpreting nor real-time text have any inherent, generalized advantage over the other in supporting deaf students in secondary or postsecondary settings. Providing deaf students with both services simultaneously does not appear to provide any generalized benefit, at least for the kinds of materials utilized here.

Comparison of an analytic horn equation approach and a boundary element method for the calculation of sound fields in the human ear canal.

The sound field inside a model human ear canal has been computed, to show both longitudinal variations along the canal length and transverse variations through cross-sectional slices. Two methods of computation were used. A modified horn equation approach parametrizes the sound field with a single coordinate, the position along a curved center axis-this approach can accommodate the curvature and varying cross-sectional area of the ear canal but cannot compute transverse variations of the sound field. A boundary element method (BEM) was also implemented to compute the full three-dimensional sound field. Over 2000 triangular mesh elements were used to represent the ear canal geometry. For a plane piston source at the entrance plane, the pressure along the curved center axis predicted by the two methods is in good agreement, for frequencies up to 15 kHz, for four different ear canals. The BEM approach, though, reveals spatial variations of sound pressure within each canal cross section. These variations are small below 4 kHz, but increase with frequency, reaching 1.5 dB at 8 kHz and 4.5 dB at 15 kHz. For source configurations that are more realistic than a simple piston, large transverse variations in sound pressure are anticipated in the vicinity of the source.

Airflow noise in telephone handsets and methods for its reduction.

The noise in a telephone handset produced by the bursts of airflow that accompany plosive sounds such as a "p" or "t" has been investigated. Measurements have been made on a series of modified handsets, using various arrangements of ports and tubes between microphone and the exterior of the telephone mouthpiece. A narrow stream of air was used to probe the mouthpiece and the signal picked up by the microphone recorded. The use of one, two, and multiple exterior holes was considered. Two-hole approaches alleviate the static pressure buildup that occurs when a single microphone hole is used and in many cases they result in reduced noise generation; for some directions of incident airflow, though, noise can be markedly increased. This was found to be due to interaction between intersecting streams of air. By using a large number of small (less than 0.5 mm) exterior holes, the airflow noise can be reduced by over 30 dB for all incident directions of airflow. It is also beneficial to ensure that none of the exterior holes is in direct line with the sound tube leading to the microphone.

Effect of handset proximity on hearing aid feedback.

The increased sensitivity of hearing aids to feedback as a telephone handset is brought near has been studied experimentally and numerically. For the measurements, three different hearing aids were modified so that the open-loop transfer function could be measured. They were mounted in the pinna of a mannikin and the change in open-loop transfer function determined as a function of handset proximity. Increases of over 20 dB were observed, most of this change occurring within the first 10 mm of separation between pinna and handset. Numerical calculations performed using a boundary element technique were in good agreement with the measurements.

Microphone array measurement system for analysis of directional and spatial variations of sound fields.

A measurement system has been developed that is capable of analyzing the directional and spatial variations in a reverberant sound field. A spherical, 32-element array of microphones is used to generate a narrow beam that is steered in 60 directions. Using an omnidirectional loudspeaker as excitation, the sound pressure arriving from each steering direction is measured as a function of time, in the form of pressure impulse responses. By subsequent analysis of these responses, the variation of arriving energy with direction is studied. The directional diffusion and directivity index of the arriving sound can be computed, as can the energy decay rate in each direction. An analysis of the 32 microphone responses themselves allows computation of the point-to-point variation of reverberation time and of sound pressure level, as well as the spatial cross-correlation coefficient, over the extent of the array. The system has been validated in simple sound fields in an anechoic chamber and in a reverberation chamber. The system characterizes these sound fields as expected, both quantitatively from the measures and qualitatively from plots of the arriving energy versus direction. It is anticipated that the system will be of value in evaluating the directional distribution of arriving energy and the degree and diffuseness of sound fields in rooms.

Scattering from impedance gratings and surface wave formation.

The scattering problem of acoustic plane waves from comb-like impedance gratings on a rigid surface has been investigated in this paper. A rigorous analytic approach for homogeneous plane-wave incidence is presented based on the periodicity of the grating structure, in which the problem was solved as a mixed boundary value problem and the scattered field was represented by the tangent velocity difference across a partition wall of the grating. A singular integral equation has been derived for the tangent velocity difference, which can directly be solved with the Gauss-Chebyshev procedure. The resulting solution consists of a series of Bloch-Floquet waves (plane bulk wave and surface wave modes) with explicit expressions for the expansion coefficients. When the grating period is much less than the incident wavelength (ka << 1), the grating structure is equivalent to a plane impedance surface and no surface waves can be excited with homogeneous plane-wave incidence. When the grating period is comparable to the incident wavelength, resonance phenomena are predicted under certain conditions and surface waves can form, even with homogeneous plane-wave incidence. The dispersion relation for surface waves has also been examined. The impedance effects of the grating on the reflection and diffraction waves as well as on the dispersion and formation of surface waves have been studied, with the acoustically hard grating being the special case of the general impedance grating.

Experimental and numerical study of air-coupled surface waves generated above strips of finite impedance.

A series of laboratory experiments are described in which air coupled surface waves are generated from a point source in the frequency range between 800 and 1700 Hz above a surface composed of a lattice of small cavities. Since the sound pressure near the lattice of cavities can be greater than if the surface was rigid, passive amplification is obtained. Moreover, directional receivers can be designed by restricting the lattice of cavities to a strip of finite width. These directional receivers are shown to provide more amplification than would be obtained with a semi-infinite lattice of cavities. Theoretical calculations using a boundary element method predict gains of up to 6 dB, relative to the pressure on a rigid plane when the strip width is of the order of 1 wavelength. The strips are further modified by changing their shape or by adding reflectors to further enhance the amplification. Gains of 12 dB have been measured and predictions show that gains of 20 dB are theoretically possible.