Accessibility of 3D Game Environments for People with Aphasia: An Exploratory Study

People with aphasia experience difficulties with all aspects of language and this can mean that their access to technology is substantially reduced. We report a study undertaken to investigate the issues that confront people with aphasia when interacting with technology, specifically 3D game environments. Five people with aphasia were observed and interviewed in twelve workshop sessions. We report the key themes that emerged from the study, such as the importance of direct mappings between users’ interactions and actions in a virtual environment. The results of the study provide some insight into the challenges, but also the opportunities, these mainstream technologies offer to people with aphasia. We discuss how these technologies could be more supportive and inclusive for people with language and communication difficulties

"Like déjà vu all over again": Patterns of perseveration in two people with jargon aphasia

Background: It has been argued that perseveration type corresponds to the level of breakdown so that total perseveration (the repetition of a whole word) involves the reactivation of a previous word at the lexical level when the target word is not sufficiently activated. A blended perseveration (the repetition of part of a previous response) results from a failure of target activation at the phoneme level (e.g. Martin & Dell 2007). This is challenged by the occurrence of non-word total perseverations, as these cannot be lexical retrievals (Hirsh 1998). A further problem is the occurrence of long intervals between perseverations and their sources. Some authors have invoked semantic relationships to explain these intervals (e.g. Martin, Roach, Brecher & Lowery 1998). Aims: This study examines the perseveration of two individuals with jargon aphasia in order to explore the proposal that while some perseveration may result from the reactivation of a recent response via the mechanisms described above, another mechanism exists whereby perseverative responses are built around default phonology, resulting in stereotypical errors. Methodology and Procedures: Tests of naming, reading and repetition were administered. Responses were analysed to determine: the extent of perseveration; the occurrence of long intervals between perseverations and their sources; patterns of phoneme use; the occurrence of non-word total perseverations. Outcomes and Results: Both individuals produced large numbers of perseverative responses. Lengthy intervals could not be explained by semantic relationships. For each participant, certain consonants were found to dominate the phoneme frequency distribution. Evidence was found of an interaction between the occurrence of perseveration and presence of these favoured consonants. The possibility that non-word total perseverations arose from a different source from word total perseverations was rejected because there was no significant difference in the use of the favoured phonemes between the two types. Conclusion: The findings support the theory of two mechanisms for perseveration. The first is local, occurring when residual activation overrides incoming activation. This is confined to a single speech act and occurs closely after the original occurrence. The second type is global, occurring across different contexts over time. It occurs because of default phonology, available in the event of a dearth of incoming activation at the phoneme level. Both total and blended perseverations may result from this mechanism. Word total perseverations may be favoured because of feedback from the phoneme level to the lexical level. Ideas for future research and implications for intervention are discussed

Micron- to nano-scale intergrowths among members of the cuprobismutite series and paderaite: HRTEM and microanalytical evidence

Copyright © 2004 The Mineralogical SocietyCoherent intergrowths, at the lattice scale, between cuprobismutite (N = 2) and structurally related padraite along both major axes (15 Åand 17 Årepeats) of the two minerals are reported within skarn from Ocna de Fier, Romania. The structural subunit, DTD, 3 layers of padraite, is involved at interfaces of the two minerals along the 15 Årepeat, as well as in transposition of 1 padraite unit to 2 cuprobismutite units along the 17 Årepeat in slip defects. Lattice images obtained by HRTEM across intervals of 200 -400 nm show short- to long-range stacking sequences of cuprobismutite and padraite ribbons. Such nanoscale slabs mimic µm-scale intergrowths observed in back-scattered electron images at three orders of magnitude greater. These slabs are compositionally equivalent to intermediaries in the cuprobismutite-padraite range encountered during microanalysis. Hodrushite (N = 1.5) is identified in the µm-scale intergrowths, but its absence in the lattice images indicates that, in this case, formation of polysomes between structurally related phases is favoured instead of stacking disorder among cuprobismutite homologues. The tendency for short-range ordering and semi-periodic occurrence of polysomes suggests they are the result of an oscillatory chemical signal with periodicity varying from one to three repeats of 15 Å, rather than simple 'accidents' or irregular structural defects. Lead distribution along the polysomes is modelled as an output signal modulated by the periodicity of stacking sequences, with Pb carried within the D units of padraite. This type of modulator acts as a patterning operator activated by chemical waves with amplitudes that encompass the chemical difference between the minerals. Conversion of the padraite structural subunit DTD to the C unit of cuprobismutite, conserving interval width, emphasizes that polysomatic modularity also assists interference of chemical signals with opposite amplitudes. Observed coarsening of lattice-scale intergrowths up to the µm-scale implies coupling between diffusion-controlled structural modulation, and rhythmic precipitation at the skarn front during crystallization.C.L. Ciobanu, A. Pring and N.J. Coo

Therapy for naming difficulties in bilingual aphasia: which language benefits?

Background: The majority of the world's population is bilingual. Yet, therapy studies involving bilingual people with aphasia are rare and have produced conflicting results. One recent study suggested that therapy can assist word retrieval in bilingual aphasia, with effects generalising to related words in the untreated language. However, this cross-linguistic generalisation only occurred into the person's stronger language (L1). While indicative, these findings were derived from just three participants, and only one received therapy in both languages. Aims: This study addressed the following questions. Do bilingual people with aphasia respond to naming therapy techniques developed for the monolingual population? Do languages respond differently to therapy and, if so, are gains influenced by language dominance? Does cross-linguistic generalisation occur and does this depend on the therapy approach? Is cross-linguistic generalisation more likely following treatment in L2 or L1? Methods & Procedures: The study involved five aphasic participants who were bilingual in English and Bengali. Testing showed that their severity and dominance patterns varied, so the study adopted a case series rather than a group design. Each person received two phases of naming therapy, one in Bengali and one in English. Each phase treated two groups of words with semantic and phonological tasks, respectively. The effects of therapy were measured with a picture-naming task involving both treated and untreated (control) items. This was administered in both languages on four occasions: two pre-therapy, one immediately post-therapy and one 4 weeks after therapy had ceased. Testing and therapy in Bengali was administered by bilingual co-workers. Outcomes & Results: Four of the five participants made significant gains from at least one episode of therapy. Benefits arose in both languages and from both semantic and phonological tasks. There were three instances of cross-linguistic generalisation, which occurred when items had been treated in the person's dominant language using semantic tasks. Conclusions & Implications: This study suggests that ‘typical’ naming treatments can be effective for some bilingual people with aphasia, with both L1 and L2 benefiting. It offers evidence of cross-linguistic generalisation, and suggests that this is most likely to arise from semantic therapy approaches. In contrast to some results in the academic literature, the direction of generalisation was from LI to L2. The theoretical implications of these findings are considered. Finally, the results support the use of bilingual co-workers in therapy delivery

A Case Study of Rock-Fluid Interaction in the Enhanced Geothermal System in Cooper Basin, South Australia

This study was undertaken to observe mineral dissolution with replacing circulating fluid with fresh water every 24 hours. This was an attempt to accelerate the dissolution rate and to mimic the condition of a geothermal site when fresh water or treated water from a precipitation tank is reinjected to the fracture. The experiments were carried out in a titanium flow through cell for 1, 7, and 28 days at 250°C and 40 bars. Water analysis was performed using ICP-MS, and rock analyses were conducted using SEM, XRD and XRF. The experimental results revealed a linear correlation of mineral (element) dissolution at the early stages of the experiment. However at later stages, the mineral dissolution proceeds at a slower rate. This may have been caused by the exhaustion of a more soluble mineral phase in the sample. Therefore, this may cause the pore size in the fracture path size to enlarge. SEM observations showed evidence of etching of the mineral surfaces consistent with partial dissolution. SEM backscattered images reveals that mostly quartz phase (SiO₂) remains after 28 days of circulation. XRD results complement these finding, that quartz was stable throughout the experiment, and that the albite-feldspar (NaAlSi₃O₈) and microcline (KALSi₃O₈) in the rock had partially dissolved. As well, ICP-MS analysis of water samples confirmed that some mineral dissolution occurred. XRF study was used to generate an elemental mass balance. Determination of the dissolution kinetics of the various minerals phase is being undertaken.Gideon Kuncoro, Yung Ngothai, Brian O'Neill, Allan Pring, Joël Bruggerhttp://www.chemeca2010.com/abstract/270.as

The Lowland Maya "Protoclassic"

The term "Protoclassic," employed regularly but inexplicitly in the literature of lowland Maya archaeology, has become increasingly nebulous and ambiguous in both meaning and usage. This paper reviews the history and use of the term and presents a formal redefinition of the Protoclassic as a ceramic stage based explicitly and exclusively on ceramic criteria. Some suggestions regarding future use of the term also are offered. The paper further addresses and resolves a number of persisting questions regarding Protoclassic orange wares, including problems concerning the actual existence of the "Aguacate ceramic group." and the relationships of Aguacate-group pottery to other emergent orange wares of the terminal Late Preclassic and initial Early Classic periods. The nature and significance of the "Holmul I Style," the "Floral Park Ceramic Sphere." and the relationships of the two to each other and the larger, redefined "protoclassic" ceramic stage also are examined. A spatial distribution for protoclassic ceramics considerably expanded over what has ever been reported previously is described, and chronometric data are presented to support a revised chronology for the protoclassic ceramic stage. Finally, ceramic data are offered that suggest a real subdivision of the protoclassic ceramic stage into an early, emergent facet originating entirely within Late Preclassic lowland traditions, and a later, fully "Classic" facet corresponding to the early Tzakol (Tzakol 1) ceramic horizon

‘Dead people don’t claim’: A psychopolitical autopsy of UK austerity suicides

One of the symptoms of post financial crisis austerity in the UK has been an increase in the numbers of suicides, especially by people who have experienced welfare reform. This article develops and utilises an analytic framework of psychopolitical autopsy to explore media coverage of ‘austerity suicide’ and to take seriously the psychic life of austerity (internalisation, shame, anxiety), embedding it in a context of social dis-ease. Drawing on three distinct yet interrelated areas of literature (the politics of affect and psychosocial dynamics of welfare, post and anti-colonial psychopolitics, and critical suicidology), the article aims to better understand how austerity ‘kills’. Key findings include understanding austerity suicides as embedded within an affective economy of the anxiety caused by punitive welfare retrenchment, the stigmatisation of being a recipient of benefits, and the internalisation of market logic that assigns value through ‘productivity’ and conceptualises welfare entitlement as economic ‘burden’. The significance of this approach lies in its ability to widen analytic framing of suicide from an individual and psychocentric focus, to illuminate culpability of government reforms while still retaining the complexity of suicide, and thus to provide relevant policy insights about welfare reform

The efficacy of speech intervention using electopalatography with an 18 year old deaf client: A single case study

This single case study explored the use of EPG as a therapeutic tool for treating inaccurate articulation of the voiceless alveolar plosive /t/. The participant (M) is an 18-year-old deaf adult who consistently uses hearing aids, and who communicates using a combination of English, Sign Supported English and British Sign Language (BSL). M received traditional phonological therapy targeting his production of /t/ prior to EPG therapy, but without success. He requested further therapy and EPG was offered as an alternative approach. Pre-EPG therapy, M made tongue placement errors for both /t/ and the voiced alveolar plosive /d/. Based on perceptual analysis by M’s speech and language therapist, the first author, his productions were inconsistent, though generally perceived as voiceless and voiced velar plosives respectively. The EPG therapy consisted of 6 bi-weekly therapy sessions, each lasting for one hour, targeting M’s production of /t/ in familiar words, using the visual feedback from the EPG display. Trained and untrained listeners perceptually analysed audio recordings of words and sentences collected at 3 assessment points. Improvements, both over the course of the EPG therapy and during the follow-up period, were found to be statistically significant. Significantly, M was able to generalise his production skills to untaught words containing both /t/ and /d/. Equally significant was the lack of change in M’s production of a control sound, the voiceless dental fricative /θ/. More globally, an improvement was observed in ratings of M’s intelligibility in sentences and in his voice quality (assessed impressionistically)

Mineral transformations in gold-(silver) tellurides in the presence of fluids: nature and experiment

Gold–(silver) telluride minerals constitute a major part of the gold endowment at a number of important deposits across the globe. A brief overview of the chemistry and structure of the main gold and silver telluride minerals is presented, focusing on the relationships between calaverite, krennerite, and sylvanite, which have overlapping compositions. These three minerals are replaced by gold–silver alloys when subjected to the actions of hydrothermal fluids under mild hydrothermal conditions (≤220 °C). An overview of the product textures, reaction mechanisms, and kinetics of the oxidative leaching of tellurium from gold–(silver) tellurides is presented. For calaverite and krennerite, the replacement reactions are relatively simple interface-coupled dissolution-reprecipitation reactions. In these reactions, the telluride minerals dissolve at the reaction interface and gold immediately precipitates and grows as gold filaments; the tellurium is oxidized to Te(IV) and is lost to the bulk solution. The replacement of sylvanite is more complex and involves two competing pathways leading to either a gold spongy alloy or a mixture of calaverite, hessite, and petzite. This work highlights the substantial progress that has been made in recent years towards understanding the mineralization processes of natural gold–(silver) telluride minerals and mustard gold under hydrothermal conditions. The results of these studies have potential implications for the industrial treatment of gold-bearing telluride minerals.Jing Zhao and Allan Prin