What can co-speech gestures in aphasia tell us about the relationship between language and gesture?: A single case study of a participant with Conduction Aphasia

Cross-linguistic evidence suggests that language typology influences how people gesture when using ‘manner-of-motion’ verbs (Kita 2000; Kita & Özyürek 2003) and that this is due to ‘online’ lexical and syntactic choices made at the time of speaking (Kita, Özyürek, Allen, Brown, Furman & Ishizuka, 2007). This paper attempts to relate these findings to the co-speech iconic gesture used by an English speaker with conduction aphasia (LT) and five controls describing a Sylvester and Tweety1 cartoon. LT produced co-speech gesture which showed distinct patterns which we relate to different aspects of her language impairment, and the lexical and syntactic choices she made during her narrative

A comparison of calculated and measured background noise rates in hard X-ray telescopes at balloon altitude

An actively shielded hard X-ray astronomical telescope has been flown on stratospheric balloons. An attempt is made to compare the measured spectral distribution of the background noise counting rates over the energy loss range 20-300 keV with the contributions estimated from a series of Monte Carlo and other computations. The relative contributions of individual particle interactions are assessed

“TOT” phenomena: Gesture production in younger and older adults

This study explored age-related changes in gesture in order to better understand the relationship between gesture and word retrieval from memory. The frequency of gestures during “Tip-of-the-Tongue” (TOT) states highlights this relationship. There is a lack of evidence describing the form and content of iconic gestures arising spontaneously in such TOT states, and a parallel gap addressing age-related variations. In this study, TOT states were induced in 45 participants from two age groups (older and younger adults) using a pseudoword paradigm. The type and frequency of gestures produced was recorded during two experimental conditions (single-word retrieval/ narrative task). We found that both groups experienced a high number of TOT states, during which they gestured. Iconic co-TOT gestures were more common than non-iconic gestures. Whilst there was no age-effect on the type of gestures produced, there was a significant, task-specific, age difference in the amount of gesturing. That is, younger adults gestured more in the narrative task, whereas older adults generated more gestures on the single-word retrieval task. Task-specific age differences suggest that there are age-related differences in terms of the cognitive operations involved in TOT gesture production

Hecke algebras of finite type are cellular

Let \cH be the one-parameter Hecke algebra associated to a finite Weyl group $W$, defined over a ground ring in which ``bad'' primes for $W$ are invertible. Using deep properties of the Kazhdan--Lusztig basis of \cH and Lusztig's \ba-function, we show that \cH has a natural cellular structure in the sense of Graham and Lehrer. Thus, we obtain a general theory of ``Specht modules'' for Hecke algebras of finite type. Previously, a general cellular structure was only known to exist in types $A_n$ and $B_n$.Comment: 14 pages; added reference

Integration of speech and gesture in aphasia

BACKGROUND: Information from speech and gesture is often integrated to comprehend a message. This integration process requires the appropriate allocation of cognitive resources to both the gesture and speech modalities. People with aphasia are likely to find integration of gesture and speech difficult. This is due to a reduction in cognitive resources, a difficulty with resource allocation or a combination of the two. Despite it being likely that people who have aphasia will have difficulty with integration, empirical evidence describing this difficulty is limited. Such a difficulty was found in a single case study by Cocks et al. in 2009, and is replicated here with a greater number of participants. AIMS: To determine whether individuals with aphasia have difficulties understanding messages in which they have to integrate speech and gesture. METHODS & PROCEDURES: Thirty-one participants with aphasia (PWA) and 30 control participants watched videos of an actor communicating a message in three different conditions: verbal only, gesture only, and verbal and gesture message combined. The message related to an action in which the name of the action (e.g., 'eat') was provided verbally and the manner of the action (e.g., hands in a position as though eating a burger) was provided gesturally. Participants then selected a picture that 'best matched' the message conveyed from a choice of four pictures which represented a gesture match only (G match), a verbal match only (V match), an integrated verbal-gesture match (Target) and an unrelated foil (UR). To determine the gain that participants obtained from integrating gesture and speech, a measure of multimodal gain (MMG) was calculated. OUTCOMES & RESULTS: The PWA were less able to integrate gesture and speech than the control participants and had significantly lower MMG scores. When the PWA had difficulty integrating, they more frequently selected the verbal match. CONCLUSIONS & IMPLICATIONS: The findings suggest that people with aphasia can have difficulty integrating speech and gesture in order to obtain meaning. Therefore, when encouraging communication partners to use gesture alongside language when communicating with people with aphasia, education regarding the types of gestures that would facilitate understanding is recommended

Iconic gesture in normal language and word searching conditions: A case of conduction aphasia

Although there is a substantive body of research about the language used by individuals with aphasia, relatively little is known about their spontaneous iconic gesture. A single case study of LT, an individual with conduction aphasia indicated qualitative differences between the spontaneous iconic gestures produced alongside fluent speech and in tip of the tongue states. The current study examined the iconic gestures produced by another individual with conduction aphasia, WT, and a group of 11 control participants. Comparisons were made between iconic gestures produced alongside normal language and those produced alongside word-searching behaviour. Participants recounted the Tweety and Sylvester cartoon Canary Row. All gesture produced was analysed qualitatively and quantitatively. WT produced more iconic gestures than controls accompanying word searching behaviour, whereas he produced a similar frequency of iconic gestures to control participants alongside normal language. The iconic gestures produced in the two language contexts also differed qualitatively. Frequency of iconic gesture production was not affected by limb apraxia. This study suggests that there are differences between iconic gestures that are produced alongside normal language and those produced alongside word-searching behaviour. Theoretical and clinical implications of these findings are discussed

The 4U 0115+63: Another energetic gamma ray binary pulsar

Following the discovery of Her X-1 as a source of pulsed 1000 Gev X-rays, a search for emission from an X-ray binary containing a pulsar with similar values of period, period derivative and luminosity was successful. The sporadic X-ray binary 4U 0115-63 has been observed, with probability 2.5 x 10 to the minus 6 power ergs/s to emit 1000 GeV gamma-rays with a time averaged energy flux of 6 to 10 to the 35th power

Enlarged symmetry algebras of spin chains, loop models, and S-matrices

The symmetry algebras of certain families of quantum spin chains are considered in detail. The simplest examples possess m states per site (m\geq2), with nearest-neighbor interactions with U(m) symmetry, under which the sites transform alternately along the chain in the fundamental m and its conjugate representation \bar{m}. We find that these spin chains, even with {\em arbitrary} coefficients of these interactions, have a symmetry algebra A_m much larger than U(m), which implies that the energy eigenstates fall into sectors that for open chains (i.e., free boundary conditions) can be labeled by j=0, 1, >..., L, for the 2L-site chain, such that the degeneracies of all eigenvalues in the jth sector are generically the same and increase rapidly with j. For large j, these degeneracies are much larger than those that would be expected from the U(m) symmetry alone. The enlarged symmetry algebra A_m(2L) consists of operators that commute in this space of states with the Temperley-Lieb algebra that is generated by the set of nearest-neighbor interaction terms; A_m(2L) is not a Yangian. There are similar results for supersymmetric chains with gl(m+n|n) symmetry of nearest-neighbor interactions, and a richer representation structure for closed chains (i.e., periodic boundary conditions). The symmetries also apply to the loop models that can be obtained from the spin chains in a spacetime or transfer matrix picture. In the loop language, the symmetries arise because the loops cannot cross. We further define tensor products of representations (for the open chains) by joining chains end to end. The fusion rules for decomposing the tensor product of representations labeled j_1 and j_2 take the same form as the Clebsch-Gordan series for SU(2). This and other structures turn the symmetry algebra \cA_m into a ribbon Hopf algebra, and we show that this is ``Morita equivalent'' to the quantum group U_q(sl_2) for m=q+q^{-1}. The open-chain results are extended to the cases |m|< 2 for which the algebras are no longer semisimple; these possess continuum limits that are critical (conformal) field theories, or massive perturbations thereof. Such models, for open and closed boundary conditions, arise in connection with disordered fermions, percolation, and polymers (self-avoiding walks), and certain non-linear sigma models, all in two dimensions. A product operation is defined in a related way for the Temperley-Lieb representations also, and the fusion rules for this are related to those for A_m or U_q(sl_2) representations; this is useful for the continuum limits also, as we discuss in a companion paper

Communication support in care homes for older adults: Views and reported practices of speech and language therapists and care home activities staff in the UK

Background Speech and language therapists (SLTs) and care home activities staff play key roles in managing and supporting the communication needs of older residents in care homes. However, the current practice and perspectives of these two professions in the United Kingdom has not been examined. Aims To investigate the practice patterns and views of SLTs and activities staff working in UK care homes for older adults in relation to residents’ communication needs. Methods and Procedures Two online surveys, with 63 questions (SLT survey) and 46 questions (activities staff survey) in total, were created using the online platform Qualtrics. Participants were asked to consider their routine practice before COVID‐19. Results were analysed using descriptive statistics and qualitative content analysis. Outcomes and Results A total of 116 valid responses were received from SLTs and 29 valid responses from activities staff. A high level of communication needs in care homes was reported by both participant groups, as was insufficient time and resources and lack of managerial encouragement in this area. SLTs reported that the majority of referrals to their service from care homes was for swallowing needs (70%). Cognitive communication difficulty was the most commonly reported communication need by SLTs (65%). Most SLTs (73%–87%) provided some level of communication intervention and considered management of residents’ communication needs to be both part of the SLT role and a good investment of their time. Lack of confidence setting goals and providing direct intervention for communication needs was reported, with 25% feeling stressed at the thought of this. The main themes from free text responses about SLT service improvement were increased staff training, funding (of resources and specialist posts) and changes to service provision (referral criteria and accessibility/awareness of SLT service). Hearing impairment was the communication need most commonly reported by activities staff (43%). Participants demonstrated relatively high awareness of communication difficulty in residents and reported high levels of knowledge and confidence identifying and supporting residents’ communication. Most (79%–89%) considered identifying and supporting the communication needs of residents to be part of their role and expressed interest in receiving further training in communication support. The reported activities staff data set may be positively biased. Conclusions and Implications SLTs and activities staff were highly motivated to support the communication needs of care home residents. Increased training, time and resources dedicated to managing the communication needs of residents emerged as opportunities for service improvement across both data sets. WHAT THIS PAPER ADDS What is already known on the subject There is a high level of communication need amongst older care home residents. Social interaction and relationships are important factors contributing to quality of life in this population and rely on successful communication. Speech and language therapists (SLTs) and activities staff play key roles in managing and supporting the communication needs of this client group, but the current practice and perspectives of these professions in the United Kingdom has not been examined. What this study adds A high level of communication need in care home residents was identified by both SLT and activities staff and both participant groups were motivated to address, identify and manage this need. However, insufficient time and resources, as well as a perceived lack of encouragement from managers to provide communication support/intervention, were reported by both groups. SLT practice was constrained by referral criteria and care pathways, which differed between services. Suggestions for SLT service improvement are reported. Clinical implications of this study Targeted, ongoing staff training is required in care homes to improve the communication environment and develop care home staff capacity to support residents’ communication needs. There is also a call for service level improvements to increase the range of SLT practice in care homes, including a greater focus on communication needs and more specialist (e.g., dementia) SLT roles

Schur elements for the Ariki-Koike algebra and applications

We study the Schur elements associated to the simple modules of the Ariki-Koike algebra. We first give a cancellation-free formula for them so that their factors can be easily read and programmed. We then study direct applications of this result. We also complete the determination of the canonical basic sets for cyclotomic Hecke algebras of type $G(l,p,n)$ in characteristic 0.Comment: The paper contains the results of arXiv:1101.146