Multitaper Spectrum Analysis of Consonants Produced by Patients With Dentofacial Disharmonies.

PURPOSE: This study investigates differences in American English consonants produced by patients who present with various dentofacial disharmonies (DFDs), including severe overbites (Class II), underbites (Class III), and anterior open bites. Previous studies have found that patients with these malocclusion types all produce lingual sibilants and plosives with increased spectral center of gravity and increased spectral variance relative to controls. This result is puzzling since some DFD groups differ from controls in opposite ways, and it is also difficult to interpret because spectral moment measures are affected by a wide range of speech and nonspeech factors. METHOD: To better understand the articulatory basis of these differences, we apply articulatorily interpretable spectral measures derived from multitaper spectra. RESULTS: We find that all groups of DFD patients produce /s ʃ t tʃ/ with midfrequency spectral peaks that are less prominent than those of the control group, but peak frequency measures are largely the same across all groups. CONCLUSION: We conclude that the DFD patients differ more in sibilant noise source properties than in front cavity filter properties.

The Relationship between Non-Native Perception and Phonological Patterning of Implosive Consonants.

This study uses non-native perception data to examine the relationship between perceived phonetic similarity of segments and their phonological patterning. Segments that are phonetically similar to one another are anticipated to pattern together phonologically, and segments that share articulatory or acoustic properties are also expected to be perceived as similar. What is not yet clear is whether segments that pattern together phonologically are perceived as similar. This study addresses this question by examining how L1 English listeners and L1 Guébie listeners perceive non-native implosive consonants compared with plosives and sonorants. English does not have contrastive implosives, whereas Guébie has a bilabial implosive. The bilabial implosive phonologically patterns with sonorants in Guébie, to the exclusion of obstruents. Two perception experiments show English listeners make more perceptual categorization errors between implosives and voiced plosives than Guébie listeners do, but both listener groups are more likely to classify implosives as similar to voiced plosives than sonorants. The results also show that Guébie listeners are better at categorizing non-native implosive consonants (i.e., alveolar implosives) than English listeners, showing that listeners are able to extend features or gestures from their L1 to non-native implosive consonants. The results of these experiments suggest a cross-linguistic perceptual similarity hierarchy of implosives compared with other segments that are not affected by L1 phonological patterning.

DENTOFACIAL DISHARMONY PATIENTS' SIBILANTS DIFFER FROM CONTROLS' MORE IN SOURCE THAN FILTER PROPERTIES.

This study uses multitaper spectral analysis to examine the differences in consonants produced by patients who present with different dentofacial disharmonies (DFD) including severe overbites (Class II), underbites (Class III) and anterior open bites. Previous studies have found that patients with these malocclusion types all produce sibilants and plosives with increased spectral center of gravity and increased spectral spread relative to controls. This result is puzzling since some DFD groups differ from controls in opposite ways. To better understand the articulatory basis of these differences, we apply several spectral shape measures and find that all groups of DFD patients produce /s ʃ t tʃ/ with mid-frequency spectral peaks that are less prominent than those of the control group, but peak frequency measures are largely the same across all groups. This indicates that the DFD patients differ more in sibilant noise source than front cavity size.1.

A peer interview qualitative study exploring support for carers of people with comorbid autism and eating disorders.

BACKGROUND: Carers of people with eating disorders (EDs) are known to experience a lack of support, high levels of unmet needs and resulting distress. Specific support and interventions for carers may benefit both the carer, and their loved one with an ED. Individuals with co-occurring autism and EDs may present with additional needs and difficulties relating to their Autism Spectrum Condition (ASC) that impact their carers. However, there is a lack of research exploring whether carers of people with ASC and EDs have specific support needs, and what kinds of support may be most beneficial for this population. METHODS: This study used a qualitative interview design, utilising peer interviews. Eleven carers participated in interviews about their experiences as a carer, and their views on existing support systems and potential improvements. As the study took place during the initial UK coronavirus lockdown, the impact of the lockdown also emerged as a topic during the interviews. Interviews were transcribed and analysed using thematic analysis. RESULTS: Five themes were identified: challenges associated with co-occurring Autism and EDs, a lack of existing support for carers from healthcare services, the personal impact of caring for someone with both ASC and EDs, ideas for how carers can be best supported, and the impact of the coronavirus on carers. CONCLUSIONS: Carers of loved ones with both ASC and EDs described the experience as having a significant personal impact on their lives, but also experienced a lack of support from healthcare services. There was a perception that caring for someone with both an ASC and EDs presents additional challenges compared to caring for someone with an ED only, and that this population therefore requires specialised support. Recommendations for possible support options, and for further research, are outlined.

Carers' views on autism and eating disorders comorbidity: qualitative study.

BACKGROUND: Patients with co-occurring anorexia nervosa and autism respond differently to eating disorder treatments. Previous interviews with patients with both conditions and clinicians working in eating disorder services has highlighted service and treatment adaptations might be beneficial and could improve outcomes for these individuals. AIMS: The aim of this study was to explore carers' experiences of current treatment approaches for people with autism who have anorexia nervosa, and their views on how these can be improved. METHOD: Ten carers of a loved one diagnosed with autism and anorexia nervosa were interviewed using a semi-structured interview schedule and the transcripts were analysed with thematic analysis. RESULTS: Four key themes emerged from the interviews: the role of autism in anorexia nervosa, carers' problems with clinical services, the impact on carers and suggestions for future improvements. CONCLUSIONS: Carers agreed that autism played a significant role in the development and maintenance of their daughters' anorexia nervosa. However, this comorbidity does not appear to be appropriately addressed in current treatment provisions. They described several difficulties, including problems getting an autism diagnosis and the perception that eating disorder services did not accept or adapt around the condition. This resulted in feelings of frustration and isolation for families, a scenario exacerbated by a perceived lack of support or specific resources for carers of individuals on the autism spectrum. Clinical recommendations on the basis of the current and previous studies are outlined.

Spatial offset of test field elements from surround elements affects the strength of motion aftereffects.

Static movement aftereffects (MAEs) were measured after adaptation to vertical square-wave luminance gratings drifting horizontally within a central window in a surrounding stationary vertical grating. The relationship between the stationary test grating and the surround was manipulated by varying the alignment of the stationary stripes in the window and those in the surround, and the type of outline separating the window and the surround [no outline, black outline (invisible on black stripes), and red outline (visible throughout its length)]. Offsetting the stripes in the window significantly increased both the duration and ratings of the strength of MAEs. Manipulating the outline had no significant effect on either measure of MAE strength. In a second experiment, in which the stationary test fields alone were presented, participants judged how segregated the test field appeared from its surround. In contrast to the MAE measures, outline as well as offset contributed to judged segregation. In a third experiment, in which test-stripe offset was systematically manipulated, segregation ratings rose with offset. However, MAE strength was greater at medium than at either small or large (180 degrees phase shift) offsets. The effects of these manipulations on the MAE are interpreted in terms of a spatial mechanism which integrates motion signals along collinear contours of the test field and surround, and so causes a reduction of motion contrast at the edges of the test field.