A Computational Evaluation of Sentence Processing Deficits in Aphasia

Individuals with agrammatic Broca's aphasia experience difficulty when processing reversible non‐canonical sentences. Different accounts have been proposed to explain this phenomenon. The Trace Deletion account (Grodzinsky, 1995, 2000, 2006) attributes this deficit to an impairment in syntactic representations, whereas others (e.g., Caplan, Waters, Dede, Michaud, & Reddy, 2007; Haarmann, Just, & Carpenter, 1997) propose that the underlying structural representations are unimpaired, but sentence comprehension is affected by processing deficits, such as slow lexical activation, reduction in memory resources, slowed processing and/or intermittent deficiency, among others. We test the claims of two processing accounts, slowed processing and intermittent deficiency, and two versions of the Trace Deletion Hypothesis (TDH), in a computational framework for sentence processing (Lewis & Vasishth, 2005) implemented in ACT‐R (Anderson, Byrne, Douglass, Lebiere, & Qin, 2004). The assumption of slowed processing is operationalized as slow procedural memory, so that each processing action is performed slower than normal, and intermittent deficiency as extra noise in the procedural memory, so that the parsing steps are more noisy than normal. We operationalize the TDH as an absence of trace information in the parse tree. To test the predictions of the models implementing these theories, we use the data from a German sentence—picture matching study reported in Hanne, Sekerina, Vasishth, Burchert, and De Bleser (2011). The data consist of offline (sentence‐picture matching accuracies and response times) and online (eye fixation proportions) measures. From among the models considered, the model assuming that both slowed processing and intermittent deficiency are present emerges as the best model of sentence processing difficulty in aphasia. The modeling of individual differences suggests that, if we assume that patients have both slowed processing and intermittent deficiency, they have them in differing degrees.     

The dialogical self in a cultural contact zone: Exploring the perceived ‘cultural correction’ function of schooling

This paper discusses a qualitative study that explores the impact the development of a cultural contact zone has upon identity processes in the Dialogical Self. The analysis draws upon interviews with Irish nationals, immigrants and asylum seekers in a new cultural contact zone. The findings illustrate uncertainty experienced as a result of immigration, suggesting that the development of the contact zone caused cultural discontinuity. The individuals' uncertainty for their cultural identities' future viability demanded the development of identity strategies to maintain continuity with their perceived cultural future, where they were faced with cultural others. Identity repositionings and a strategy to maintain continuity will be explored in the current paper. The Irish and asylum seeker participants' unprompted focus on schooling will be explored as a continuity strategy. The participants constructed schooling as a tool for the ‘cultural correction’ of migrant children and a means for the assimilation of migrants into the Irish community. The paper discusses the function of this strategy for the two groups, and the theoretical integration of cultural level processes in the theory of the Dialogical Self. Copyright © 2009 John Wiley & Sons, Ltd.     

Tactile discrimination performance in split-brain monkeys with secondary posterior parietal discharges

Summary Four split-brain monkeys showing EEG evidence of secondary discharges were trained to make tactile discriminations. No impairment in learning was found for the hand contralateral to the secondary hemisphere. This supports the view that epileptic discharges in the absence of cortical damage are unable to disrupt learning of tactile discrimination tasks.     

Statistical Effects of Religious Participation and Marriage on Substance Use and Abuse in Racial and Ethnic Minorities

Substance use and abuse, which includes alcohol use, alcohol dependence, drug use, and drug dependence, inflicts a substantial toll on Americans. Although studies have demonstrated the protective effect of social support, such as religious participation and via marriage, understanding their influence on racial and ethnic minorities is limited. Thus, the aim of this study is to assess the impact of social support on substance use and abuse in racial and ethnic minorities. The Collaborative Psychiatric Epidemiology Surveys, sponsored by the National Institute of Mental Health, a repository of race, ethnicity, and mental health data, was leveraged to develop four models using multivariate analysis, specifically logistic regression to estimate the probability of meeting the criteria for substance use and abuse. Racial and ethnic minorities were found to have lower rates of substance use and abuse compared to Whites, and foreign-born individuals were consistently less likely to use or abuse substances compared to American-born minorities. Mental health conditions were highly associated with substance use and abuse, and social support by way of religious participation and marriage was protective against substance use and abuse. In racial and ethnic minorities, nativity and social support were protective against substance use and abuse; however, these protective factors did not completely eliminate risk. Thus, although race and ethnicity are important to understanding health outcomes and health behaviors, such as substance use and abuse, it is the intersection of multiple factors, representing internal and external forces, which may be more informative and offer a more comprehensive picture of the landscape influencing drug and alcohol use and dependence. Targeted interventions should consider leveraging religious spaces and bilingual materials when attempting to reach racial and ethnic minorities.     

Production of non-canonical sentences in agrammatic aphasia: limits in representation or rule application?

The study reported here compares two linguistically informed hypotheses on agrammatic sentence production, the TPH [Friedmann, N., & Grodzinsky, Y. (1997). Tense and agreement in agrammatic production: Pruning the syntactic tree. Brain and Language, 56, 397-425.] and the DOP [Bastiaanse, R., & van Zonneveld, R. (2005). Sentence production with verbs of alternating transitivity in agrammatic Broca's aphasia. Journal of Neurolinguistics, 18, 59-66]. To explain impaired production of non-canonical sentences in agrammatism, the TPH basically relies on deleted or pruned clause structure positions in the left periphery, whereas the DOP appeals to limitations in the application of movement rules. Certain non-canonical sentences such as object-questions and object-relative clauses require the availability of nodes in the left periphery as well as movement to these nodes. In languages with relatively fixed word order such as English, the relevant test cases generally involve a coincidence of left periphery and movement, such that the predictions of the TPH and the DOP are identical although for different reasons. In languages with relatively free word order such as German, on the other hand, it is possible to devise specific tests of the different predictions due to the availability of scrambling. Scrambled object sentences, for example, do not involve the left periphery but do require application of movement in a domain below the left periphery. A study was conducted with German agrammatic subjects which elicited canonical sentences without object movement and non-canonical scrambled sentences with object movement. The results show that agrammatic speakers have a particular problem with the production of scrambled sentences. Further evidence reported in the study from spontaneous speech, elicitation of object relatives, questions and passives and with different agrammatic subjects confirms that non-canonical sentences are generally harder to produce for agrammatics. These findings provide evidence in favor of the DOP and it will be argued that a cross-modal explanation of agrammatic deficits is possible if two factors--movement and canonicity--are taken into consideration.     

Tense and Agreement dissociations in German agrammatic speakers: underspecification vs. hierarchy

The aim of the present paper was to investigate whether German agrammatic production data are compatible with the Tree-Pruning-Hypothesis (TPH; Friedmann & Grodzinsky, 1997). The theory predicts unidirectional patterns of dissociation in agrammatic production data with respect to Tense and Agreement. However, there was evidence of a double dissociation between Tense and Agreement in our data. The presence of a bidirectional dissociation is incompatible with any theory which assumes a hierarchical order between these categories such as the TPH or other versions thereof (such as Lee's, 2003 top--down hypothesis). It will be argued that the data can better be accounted for by relying on newer linguistic theories such as the Minimalist Program (MP,), which does not assume a hierarchical order between independent syntactic Tense and Agreement nodes but treats them as different features (semantically interpretable vs. uninterpretable) under a single node.     

Developing Metacompetence in Low Intensity Cognitive‐Behavioural Therapy (CBT) Interventions: Evaluating a Self‐Practice/Self‐Reflection Programme for Experienced Low Intensity CBT Practitioners

Self‐practice/self‐reflection (SP/SR) is a targeted training and professional development strategy in which clinicians practice cognitive‐behavioural therapy (CBT) techniques and processes on themselves and then working through a structured process of self‐reflection. Previous studies with CBT trainees and experienced mental health practitioners have found that SP/SR or experiencing CBT “from the inside out” has been perceived by participants as increasing competency in a number of important areas and increasing therapist flexibility and artistry. Low intensity (LI) practitioners are identified as a relatively new addition to mental health service delivery in the UK. These workers are differentiated from traditional mental health practitioners by a shorter training period, the delivery of a circumscribed number of CBT interventions, and a very high weekly patient load. This study, the first of its kind, reports outcomes from an SP/SR programme undertaken by seven experienced LI CBT practitioners. Participants used the following measures to track their experience of the programme: time spent on programme, personal‐ and therapy‐related belief rating, goals attained, and perceived skill rated for average and most difficult patients. Results showed a positive change in work‐related skill and behaviour change, particularly when working with the more difficult patients. The findings are consistent with those found in other groups of therapists (e.g., trainee CBT therapists and highly experienced CBT therapists), suggesting that SP/SR may be a valuable addition to LI intensity training and professional development. These findings are discussed in the context of the particular needs of LI practitioners.     

Does morphology make the difference? Agrammatic sentence comprehension in German

This study examines the syntactic comprehension of seven German agrammatic speakers. The German language allows the study of the interaction of syntactic principles and morphological devices in the comprehension process. In addition, due to its relatively free word order, German allows the study of strictly minimal pairs of canonical and non-canonical sentences in addition to the rather controversial active-passive contrast. A central research question was whether the pattern of agrammatic comprehension predicted by the trace deletion hypothesis (TDH, Grodzinsky, 1990, 1995), relatively normal comprehension performance of canonical sentences and chance performance on non-canonical sentences, can be found in a language with richer morphology than English. The generalisability of the TDH-pattern to morphologically rich languages is not obvious, given that case morphology in particular can provide explicit cues to the detection of the agent and patient roles in a sentence. The results of this study indicate that morphology does not make a difference. Furthermore, the group results are in line with the TDH-predictions only for number marked sentences but not for case marked sentences. However, single case analysis reveals different patterns of syntactic comprehension in agrammatic patients, a spectrum that encompasses near-normal comprehension of canonical and non-canonical sentences, overall chance performance, and TDH-like profiles.     

Understanding the Labour Market Participation of Skilled Immigrant Women in Switzerland: The Interplay of Class, Ethnicity, and Gender

Switzerland has recently adopted immigration policies that give preference to skilled migrants, the assumption being that migrants with higher education will integrate easily. Our study of 57 skilled immigrant women from Latin America, the Middle East and Southeastern Europe shows that this assumption is largely unjustified. Most of the women cannot use their social and cultural capital to establish themselves in the upper segments of the labour market. A third are not integrated in the labour market and a quarter occupy positions below their skill-level. A further third work at their skill-level but only irregularly. The differentiated participation of these immigrants in the labour market is well explained by analysing the interplay of class, ethnicity and gender.