Deaf Signers Research Articles

The Impact of Aging on Spatial Abilities in Deaf Users of a Sign Language.

Research involving the general population of people who use a spoken language to communicate has demonstrated that older adults experience cognitive and physical changes associated with aging. Notwithstanding the differences in the cognitive processes involved in sign and spoken languages, it is possible that aging can also affect cognitive processing in deaf signers. This research aims to explore the impact of aging on spatial abilities among sign language users. Results showed that younger signers were more accurate than older signers on all spatial tasks. Therefore, the age-related impact on spatial abilities found in the older hearing population can be generalized to the population of signers. Potential implications for sign language production and comprehension are discussed.

The sign superiority effect: Lexical status facilitates peripheral handshape identification for deaf signers.

Deaf signers exhibit an enhanced ability to process information in their peripheral visual field, particularly the motion of dots or orientation of lines. Does their experience processing sign language, which involves identifying meaningful visual forms across the visual field, contribute to this enhancement? We tested whether deaf signers recruit language knowledge to facilitate peripheral identification through a sign superiority effect (i.e., better handshape discrimination in a sign than a pseudosign) and whether such a superiority effect might be responsible for perceptual enhancements relative to hearing individuals (i.e., a decrease in the effect of eccentricity on perceptual identification). Deaf signers and hearing signers or nonsigners identified the handshape presented within a static ASL fingerspelling letter (Experiment 1), fingerspelled sequence (Experiment 2), or sign or pseudosign (Experiment 3) presented in the near or far periphery. Accuracy on all tasks was higher for deaf signers than hearing nonsigning participants and was higher in the near than the far periphery. Across experiments, there were different patterns of interactions between hearing status and eccentricity depending on the type of stimulus; deaf signers showed an effect of eccentricity for static fingerspelled letters, fingerspelled sequences, and pseudosigns but not for ASL signs. In contrast, hearing nonsigners showed an effect of eccentricity for all stimuli. Thus, deaf signers recruit lexical knowledge to facilitate peripheral perceptual identification, and this perceptual enhancement may derive from their extensive experience processing visual linguistic information in the periphery during sign comprehension. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Functional neuroanatomy of language without speech: An ALE meta-analysis of sign language.

Sign language (SL) conveys linguistic information using gestures instead of sounds. Here, we apply a meta‐analytic estimation approach to neuroimaging studies (N = 23; subjects = 316) and ask whether SL comprehension in deaf signers relies on the same primarily left‐hemispheric cortical network implicated in spoken and written language (SWL) comprehension in hearing speakers. We show that: (a) SL recruits bilateral fronto‐temporo‐occipital regions with strong left‐lateralization in the posterior inferior frontal gyrus known as Broca's area, mirroring functional asymmetries observed for SWL. (b) Within this SL network, Broca's area constitutes a hub which attributes abstract linguistic information to gestures. (c) SL‐specific voxels in Broca's area are also crucially involved in SWL, as confirmed by meta‐analytic connectivity modeling using an independent large‐scale neuroimaging database. This strongly suggests that the human brain evolved a lateralized language network with a supramodal hub in Broca's area which computes linguistic information independent of speech.

Evidence of an Effect of Gaming Experience on Visuospatial Attention in Deaf but Not in Hearing Individuals.

Auditory cortex in congenitally deaf early sign language users reorganizes to support cognitive processing in the visual domain. However, evidence suggests that the potential benefits of this reorganization are largely unrealized. At the same time, there is growing evidence that experience of playing computer and console games improves visual cognition, in particular visuospatial attentional processes. In the present study, we investigated in a group of deaf early signers whether those who reported recently playing computer or console games (deaf gamers) had better visuospatial attentional control than those who reported not playing such games (deaf non-gamers), and whether any such effect was related to cognitive processing in the visual domain. Using a classic test of attentional control, the Eriksen Flanker task, we found that deaf gamers performed on a par with hearing controls, while the performance of deaf non-gamers was poorer. Among hearing controls there was no effect of gaming. This suggests that deaf gamers may have better visuospatial attentional control than deaf non-gamers, probably because they are less susceptible to parafoveal distractions. Future work should examine the robustness of this potential gaming benefit and whether it is associated with neural plasticity in early deaf signers, as well as whether gaming intervention can improve visuospatial cognition in deaf people.

Social App Accessibility for Deaf Signers

Social media platforms support the sharing of written text, video, and audio. All of these formats may be inaccessible to people who are deaf or hard of hearing (DHH), particularly those who primarily communicate via sign language, people who we call Deaf signers. We study how Deaf signers engage with social platforms, focusing on how they share content and the barriers they face. We employ a mixed-methods approach involving seven in-depth interviews and a survey of a larger population (n = 60). We find that Deaf signers share the most in written English, despite their desire to share in sign language. We further identify key areas of difficulty in consuming content (e.g., lack of captions for spoken content in videos) and producing content (e.g., captioning signed videos, signing into a phone camera) on social media platforms. Our results both provide novel insights into social media use by Deaf signers and reinforce prior findings on DHH communication more generally, while revealing potential ways to make social media platforms more accessible to Deaf signers.

Variação na produção de sinais da Libras à luz da Fonologia Gestual

Os sinais da língua brasileira de sinais, Libras, são tipicamente realizados com uma ou duas mãos. Apesar disso, observa-se a ocorrência de variação no número de mãos de alguns desses sinais. Este trabalho apresenta os resultados de um experimento realizado para determinar se (1) a variação no número de mãos na produção de três sinais da Libras (PRECISAR, QUERER e JÁ) decorre da coarticulação, ou seja, da inluência do número de mãos do sinal precedente (coarticulação perseveratória) ou seguinte (coarticulação antecipatória) sobre o deles, e (2) se, assim como tem sido demonstrado para as línguas orais, o aumento na taxa de elocução também aumenta a ocorrência de coarticulação. O experimento contou com a participação de quatro sinalizantes surdos (dois homens e duas mulheres) e consistiu de três partes. A primeira, uma entrevista, objetivou eliciar os sinais em análise em sua forma isolada. A segunda, um jogo, eliciou tais sinais em diferentes contextos fonético-fonológicos, mas de uma forma lúdica. Por im, a terceira também consistiu na eliciação dos sinais-alvo em contextos fonético-fonológicos distintos, porém, diferentemente do jogo, se restringiu à sinalização de cada enunciado em duas taxas (normal e rápida). Os resultados mostram que a ocorrência de coarticulação varia em função do sujeito, do sinal, do contexto e da taxa.

Lexical processing in sign language: A visual mismatch negativity study

Event-related potential studies of spoken and written language show the automatic access of auditory and visual words, as indexed by mismatch negativity (MMN) or visual MMN (vMMN). The present study examined whether the same automatic lexical processing occurs in a visual-gestural language, i.e., Hong Kong Sign Language (HKSL). Using a classic visual oddball paradigm, deaf signers and hearing non-signers were presented with a sequence of static images representing HKSL lexical signs and non-signs. When compared with hearing non-signers, deaf signers exhibited an enhanced vMMN elicited by the lexical signs at around 230 ms, and a larger P1–N170 complex evoked by both lexical sign and non-sign standards at the parieto-occipital area in the early time window between 65 ms and 170 ms. These findings indicate that deaf signers implicitly process the lexical sign and that neural response differences between deaf signers and hearing non-signers occur at the early stage of sign processing.

You Have the Right to Remain Signing

This paper presents a first snapshot of what we know about how the Irish justice system responds to deaf signers. We look specifically at engagement with An Garda Síochána, the District Court and the Irish Prison Service. We draw on a body of data that stems from (i) the European Commission funded Justisigns Project, (ii) the ‘grey literature’, and (iii) a small study of how equally deaf prisoners access services available to hearing prisoners. We set out to document and benchmark provisions, mapping current practice against the requirements of the European Directives, and reflecting on how these sit with respect to the obligations outlined in the Irish Sign Language Act (2017) and the UNCRPD (2006). We identify a number of gaps arising from systemic issues such as the siloed manual recording of requests for interpreting, quality assurance protocols where interpreters are provided (e.g. the video recording of all parties), and arising from this, the limited opportunities for true evidence-led practice for all those engaged with deaf signers in the Irish justice system.

Age of sign language acquisition has lifelong effect on syntactic preferences in sign language users

Acquisition of natural language has been shown to fundamentally impact both one’s ability to use the first language and the ability to learn subsequent languages later in life. Sign languages offer a unique perspective on this issue because Deaf signers receive access to signed input at varying ages. The majority acquires sign language in (early) childhood, but some learn sign language later—a situation that is drastically different from that of spoken language acquisition. To investigate the effect of age of sign language acquisition and its potential interplay with age in signers, we examined grammatical acceptability ratings and reaction time measures in a group of Deaf signers (age range = 28–58 years) with early (0–3 years) or later (4–7 years) acquisition of sign language in childhood. Behavioral responses to grammatical word order variations (subject–object–verb [SOV] vs. object–subject–verb [OSV]) were examined in sentences that included (1) simple sentences, (2) topicalized sentences, and (3) sentences involving manual classifier constructions, uniquely characteristic of sign languages. Overall, older participants responded more slowly. Age of acquisition had subtle effects on acceptability ratings, whereby the direction of the effect depended on the specific linguistic structure.

Markers of epistemic modality and their origins

Abstract Native deaf signers express epistemic modality by different means: mental-state words, clause-internal particles, signs indicating hypothesis, and nonmanually. The data for this study come from two unrelated sign languages, Danish Sign Language and Japanese Sign Language. In dialogues the signers use both calques of majority-language words and signs that appear to have emerged in the sign languages only. Based on the multifunctionality of some word forms, the origin of the epistemic modal particles may be traced back to tags, interjections, and lexical signs, a route motivated by interaction and also found in unrelated spoken languages. Furthermore, in both sign languages, the first-person pronoun can be used, without a verb, as an epistemic “anchor” of a proposition, a construction that seems specific to languages in the gestural-visual modality. Another modality-specific feature is the possibility of transferring the expression of a marker of epistemic uncertainty from one articulator to another.

EEG frequency-tagging demonstrates increased left hemispheric involvement and crossmodal plasticity for face processing in congenitally deaf signers

In humans, face-processing relies on a network of brain regions predominantly in the right occipito-temporal cortex. We tested congenitally deaf (CD) signers and matched hearing controls (HC) to investigate the experience dependence of the cortical organization of face processing. Specifically, we used EEG frequency-tagging to evaluate: (1) Face-Object Categorization, (2) Emotional Facial-Expression Discrimination and (3) Individual Face Discrimination. The EEG was recorded to visual stimuli presented at a rate of 6 Hz, with oddball stimuli at a rate of 1.2 Hz. In all three experiments and in both groups, significant face discriminative responses were found. Face-Object categorization was associated to a relative increased involvement of the left hemisphere in CD individuals compared to HC individuals. A similar trend was observed for Emotional Facial-Expression discrimination but not for Individual Face Discrimination. Source reconstruction suggested a greater activation of the auditory cortices in the CD group for Individual Face Discrimination. These findings suggest that the experience dependence of the relative contribution of the two hemispheres as well as crossmodal plasticity vary with different aspects of face processing.

“Sign to me, not the children”: Ideologies of language contamination at a deaf tourist site in Bali

Certain historical processes and sign language ideologies have led to the dissemination of American Sign Language (ASL) signs throughout Southeast Asia via deaf education projects, international development interventions, and tourism, notably in Cambodia and Indonesia. These ideologies normalized attempts to develop standardised sign systems based on national spoken languages and the introduction of signs from foreign sign languages, especially ASL. This history has shaped and mobilized ideas among deaf sign language users about language contact, the spread of hegemonic national sign languages, and the vitality of sign languages outside of the US and western Europe. Some of these ideologies manifest in deaf signers’ concerns about the vitality of what are often perceived to be non-hegemonic sign languages (e.g., sign languages that are not ASL, Auslan, or BSL) and language practices. By examining discourses and practices in the context of encounters between deaf tourists and deaf leaders in Bali, this article approaches larger questions about the territorialization of sign languages, linguistic boundaries, language contact, and sign language vitality.

Tactile Enumeration and Embodied Numerosity Among the Deaf.

Representations of the fingers are embodied in our cognition and influence performance in enumeration tasks. Among deaf signers, the fingers also serve as a tool for communication in sign language. Previous studies in normal hearing (NH) participants showed effects of embodiment (i.e., embodied numerosity) on tactile enumeration using the fingers of one hand. In this research, we examined the influence of extensive visuo-manual use on tactile enumeration among the deaf. We carried out four enumeration task experiments, using 1-5 stimuli, on a profoundly deaf group (n=16) and a matching NH group (n=15): (a) tactile enumeration using one hand, (b) tactile enumeration using two hands, (c) visual enumeration of finger signs, and (d) visual enumeration of dots. In the tactile tasks, we found salient embodied effects in the deaf group compared to the NH group. In the visual enumeration of finger signs task, we controlled the meanings of the stimuli presentation type (e.g., finger-counting habit, fingerspelled letters, both or neither). Interestingly, when comparing fingerspelled letters to neutrals (i.e., not letters or numerical finger-counting signs), an inhibition pattern was observed among the deaf. The findings uncover the influence of rich visuo-manual experiences and language on embodied representations. In addition, we propose that these influences can partially account for the lag in mathematical competencies in the deaf compared to NH peers. Lastly, we further discuss how our findings support a contemporary model for mental numerical representations and finger-counting habits.

Ideologies behind the scoring of factors to rate sign language vitality

This article examines ideologies underlying the rating of sign language vitality. The discussion is based on a 2011 survey by UNESCO and the International Institute for Sign Languages and Deaf Studies, and a newer survey by UNESCO, released in 2018. Ideologies of biodiversity and culture that appear in discourse about language vitality generally are examined. Three of the factors used to determine the vitality scores of 15 sign languages during the first survey (Safar and Webster, 2014; Webster and Safar, 2019) are considered from an ideological perspective. Further ideological issues that surfaced during this survey are then explored through a case study on endangered village sign languages in Mexico. Lastly, some ideological aspects of UNESCO's 2018 survey are scrutinised, including its accessibility to deaf signers, emphasis on hierarchical globalist structures, and presentation of sign languages as bounded entities that fit into binary categories. We find problems with framing sign languages within endangerment ideologies and relying on academic perceptions of ‘language’ that differ from the beliefs of language communities themselves. These vitality surveys provide a starting point for more robust mixed-methods assessments, which should take more account of sign language communities' own perspectives.

Sign phonological parameters modulate parafoveal preview effects in deaf readers

Research has found that deaf readers unconsciously activate sign translations of written words while reading. However, the ways in which different sign phonological parameters associated with these sign translations tie into reading processes have received little attention in the literature. In this study on Chinese reading, we used a parafoveal preview paradigm to investigate how four different types of sign phonologically related preview affect reading processes in adult deaf signers of Hong Kong Sign Language (HKSL). The four types of sign phonologically related preview-target pair were: (1) pairs with HKSL translations that overlapped in three parameters—handshape, location, and movement; (2) pairs that overlapped in only handshape and location; (3) pairs that only overlapped in handshape and movement; and (4) pairs that only overlapped in location and movement. Results showed that the handshape parameter was of particular importance as only sign translation pairs that had handshape among their overlapping sign phonological parameters led to early sign activation. Furthermore, we found that, compared to control previews, deaf readers took longer to read targets when the sign translation previews overlapped with targets in either handshape and movement or handshape, movement, and location. In contrast, fixation times on targets were shorter when previews and targets overlapped location and any single additional parameter—either handshape or movement. These results indicate that the phonological parameters of handshape, location, and movement are activated via orthography during Chinese reading and can have different effects on parafoveal processing in deaf signers of HKSL.

Development and Validation of an Instrument to Measure Nurses' Beliefs Toward Deaf and Hard of Hearing Interaction.

Nurse-patient communication has a significant effect on health outcomes and quality of care. The purpose of this research was to develop and validate an instrument to measure nurses' beliefs toward interacting with Deaf signers, non-signing deaf, and hard of hearing (DdHH) patients. Initial pool items created based on literature review. Content validated by DdHH and hearing registered nurses (RNs) and certified interpreters working in healthcare. Resulting D/deaf and Hard of Hearing Interaction Beliefs Scale for Registered Nurses (DdHH-IBS/RN) administered to two groups of RNs. Two validation studies conducted. Analyses demonstrated high inter-item reliability, internal consistency reliability, and stability reliability of a 25-item DdHH-IBS/RN. Confirmatory factor analysis supported hypothesized structure of the scale. The DdHH-IBS/RN is a reliable and valid scale to measure nurses' beliefs towards DdHH interaction.

Pre-output Language Monitoring in Sign Production.

A domain-general monitoring mechanism is proposed to be involved in overt speech monitoring. This mechanism is reflected in a medial frontal component, the error negativity (Ne), present in both errors and correct trials (Ne-like wave) but larger in errors than correct trials. In overt speech production, this negativity starts to rise before speech onset and is therefore associated with inner speech monitoring. Here, we investigate whether the same monitoring mechanism is involved in sign language production. Twenty deaf signers (American Sign Language [ASL] dominant) and 16 hearing signers (English dominant) participated in a picture-word interference paradigm in ASL. As in previous studies, ASL naming latencies were measured using the keyboard release time. EEG results revealed a medial frontal negativity peaking within 15 msec after keyboard release in the deaf signers. This negativity was larger in errors than correct trials, as previously observed in spoken language production. No clear negativity was present in the hearing signers. In addition, the slope of the Ne was correlated with ASL proficiency (measured by the ASL Sentence Repetition Task) across signers. Our results indicate that a similar medial frontal mechanism is engaged in preoutput language monitoring in sign and spoken language production. These results suggest that the monitoring mechanism reflected by the Ne/Ne-like wave is independent of output modality (i.e., spoken or signed) and likely monitors prearticulatory representations of language. Differences between groups may be linked to several factors including differences in language proficiency or more variable lexical access to motor programming latencies for hearing than deaf signers.

Effects of age on American Sign Language sentence repetition.

The study of deaf users of signed languages, who often experience delays in primary language (L1) acquisition, permits a unique opportunity to examine the effects of aging on the processing of an L1 acquired under delayed or protracted development. A cohort of 107 congenitally deaf adult signers ages 45-85 years who were exposed to American Sign Language (ASL) either in infancy, early childhood, or late childhood were tested using an ASL sentence repetition test. Participants repeated 20 sentences that gradually increased in length and complexity. Logistic mixed-effects regression with the variables of chronological age (CA) and age of acquisition (AoA) was used to assess sentence repetition accuracy. Results showed that CA was a significant predictor, with increased age being associated with decreased likelihood to reproduce a sentence correctly (odds ratio [OR] = 0.56, p = .010). In addition, effects of AoA were observed. Relative to native deaf signers, those who acquired ASL in early childhood were less likely to successfully reproduce a sentence (OR = 0.42, p = .003), as were subjects who learned ASL in late childhood (OR = 0.27, p < .001). These data show that aging affects verbatim recall in deaf users of ASL and that the age of sign language acquisition has a significant and lasting effect on repetition ability, even after decades of sign language use. These data show evidence for life-span continuity of early life effects. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Development of the Hong Kong Sign Language Sentence Repetition Test.

This paper presents the design and development of the Hong Kong Sign Language-Sentence Repetition Test (HKSL-SRT). It will be argued that the test offers evidence of discriminability, reliability, as well as practicality and can serve as an effective global measurement of individuals' proficiency in HKSL. The full version of the test consists of 40 signed sentences of increasing length and complexity. Specifically, we will evaluate the manual and non-manual components of these sentences to find out whether and to what extent they can differentiate three groups of deaf signers, namely, native signers, early learners and late learners. Statistical analyses show that the test scores based on a correct repetition of the manual signs of each sentence bear a significant negative correlation with signers' age of acquisition. Including the correct repetition of non-manuals in the scoring scheme can result in higher reliability and separation index of the test in the Rasch model. This paper will also discuss how psychometric measures of Rasch analysis, including the concept of fit and the rankings of items/persons in the Wright map, have been applied to the original list of the 40 sentence items for the development of a shortened test.

Mediating identities

Deaf people’s lives are frequently predicated on working with interpreters. Identity becomes known and performed through the translated self in many interactions with hearing, non-signing people. Taking an interdisciplinary approach in combining interpreting studies, deaf studies, applied linguistics and social research, the ‘Translating the Deaf Self ’ project, funded by the Arts and Humanities Research Council (UK), sought to explore the experience of deaf people and other stakeholders of the lived experience of being translated. Drawing on discourses of identity, representation and trust, this paper gives an overview of the findings from two focus groups with sign language interpreters (n = 7) on their perspectives of the experiences of deaf signers being ‘known’ through interpreting. Social constructionism underpinned our approach to data analysis and the dominant theme of ‘trust’ was examined with reference to a framework for trustworthiness developed by Alan Jones and Samantha Sin. In particular, we focus on the issue of trust in relation to representation, relationships, ability and boundaries. The main findings demonstrate that sign language interpreters are acutely aware of the responsibility they have to represent deaf signers, especially at work, and thus represent their professional-and-deaf identities, and the important role of trust for deaf professionals to feel represented through interpreters.&#x0D; &#x0D; &#x0D; Open Access Attribution: CC BY