Do age-related word retrieval difficulties appear (or disappear) in connected speech?

We conducted a comprehensive literature review of studies of word retrieval in connected speech in healthy aging and reviewed relevant aphasia research that could shed light on the aging literature. Four main hypotheses guided the review: (1) Significant retrieval difficulties would lead to reduced output in connected speech. (2) Significant retrieval difficulties would lead to a more limited lexical variety in connected speech. (3) Significant retrieval difficulties would lead to an increase in word substitution errors and in pronoun use as well as to greater dysfluency and hesitation in connected speech. (4) Retrieval difficulties on tests of single-word production would be associated with measures of word retrieval in connected speech. Studies on aging did not confirm these four hypotheses, unlike studies on aphasia that generally did. The review suggests that future research should investigate how context facilitates word production in old age.     

Cumulative mild head injury (CMHI) among college rugby players: A replication and extension study

We investigated the prevalence of cumulative mild head injury (CMHI) symptoms among college student rugby players pre- and post-season. The players completed a number of neuropsychological tests known to be sensitive to CMHI effects: vocabulary, working memory, motor coordination, and a self-report Post Concussive Symptomology (PCS) checklist. A total of 18 rugby players registered at a South African university were participants (age range 18 to 24 years, SD?=?2.02 years). Data were analysed utilising Fishers Exact Test comparisons of pre- and post-season mean scores. There was significant variability on mean scores between the rugby forwards and backline players in terms of verbal memory and concept formation, cognitive flexibility, working memory, and visual motor-processing speed. Poorer overall scores from the rugby forwards may also be indicative of depression as they reported more insomnia and anger on the PCS than the backline players.     

Students with Exceptionalities and the Peer Group Context of Bullying and Victimization in Late Elementary School

We examined bullying and victimization in 5th grade classrooms in relation to students’ education status and peer group membership. The sample consisted of 484 participants (258 girls, 226 boys), including 369 general education students, 74 academically gifted students, and 41 students with mild disabilities. Students with mild disabilities were more likely to be perceived as being bullies by both teachers and peers. Teachers also rated students with mild disabilities significantly higher for being bullied by peers. Academically gifted students were rated by teachers as the lowest for both bullying and being bullied. Associating with aggressive or perceived-popular peers increased the likelihood of being perceived as a bully. Social isolates were more likely to be bullied than students who did not associate with perceived-popular peers who, in turn, were more likely to be bullied than students who associated with perceived-popular peers. Students with mild disabilities who had aggressive and perceived-popular associates had more peer nominations for bullying than all others. In contrast, students in general education with neither aggressive nor perceived-popular associates had the fewest peer nominations for bullying. We discuss implications for research and intervention.     

Impact of Conflict on Mental Health in Northern Ireland: The Mediating Role of Intergroup Forgiveness and Collective Guilt

The aim of the present research was to investigate the mediating role of group-level forgiveness and guilt in the relationship between victimhood (the extent to which the conflict affected an individual's life), exposure to violence (the level of violence in their area of residence), and group identity on the one hand, and mild psychiatric morbidity on the other. Specifically the study focused on the psychological impact of the ethnopolitical conflict in Northern Ireland, utilizing people's identification with either the Catholic or Protestant community. Our results revealed that intergroup forgiveness mediated the relationship between both victimhood and group identification, as predictors, and mild psychiatric morbidity. Collective guilt, on the other hand, mediated the relationship between both exposure to violence and group identification, as predictors, and intergroup forgiveness. Overall this study shows that forgiveness and collective guilt can act as mediators in the relationship between impact of ethnopolitical conflict and mental health, at the group level, and thus demonstrates their centrality to the reconciliation process. Implications for intergroup reconciliation initiatives in Northern Ireland are discussed.     

语言与音乐活动的脑机制研究述评

语言和音乐是否具有相同加工机制的争论持续了很长时间。对失语症和失乐症的研究进行了简要回顾,并结合ERP和功能神经影像对语言和音乐的对比加工及同步加工分别进行研究,发现两者很大程度上存在加工机制的重合,即具有共同的神经加工源。对音乐加工的多个领域进行研究有助于语言加工研究的进展,两者的结合有着更深远的应用前景     

Visuomotor tracking abilities of speakers with apraxia of speech or conduction aphasia

This investigation examined the visuomotor tracking abilities of persons with apraxia of speech (AOS) or conduction aphasia (CA). In addition, tracking performance was correlated with perceptual judgments of speech accuracy. Five individuals with AOS and four with CA served as participants, as well as an equal number of healthy controls matched by age and gender. Participants tracked predictable (sinusoidal) and unpredictable signals using jaw and lip movements transduced with strain gauges. Tracking performance in participants with AOS was poorest for predictable signals, with decreased kinematic measures of cross-correlation and gain ratio and increased target-tracker difference. In contrast, tracking of the unpredictable signal by participants with AOS was performed as well as for other groups (e.g. participants with CA, healthy controls). Performance of the subjects with AOS on the predictable tracking task was found to strongly correlate with perceptual judgments of speech. These findings suggest that motor control capabilities are impaired in AOS, but not in CA. Results suggest that AOS has its basis in motor programming deficits, not impaired motor execution.     

Selective attention in early Dementia of Alzheimer Type

This study explored possible deficits in selective attention brought about by Dementia of Alzheimer Type (DAT). In three experiments, we tested patients with early DAT, healthy elderly, and young adults under low memory demands to assess perceptual filtering, conflict resolution, and set switching abilities. We found no evidence of impaired perceptual filtering nor evidence of impaired conflict resolution in early DAT. In contrast, early DAT patients did exhibit a global cost in set switching consistent with an inability to maintain the goals of the task (mental set). We discuss these findings in relation to the DAT literature on executive attention, dual-tasking, and working memory.     

Absence of differences in the learning rate of a speed–accuracy movement task between women patients with mild and major depression and healthy adult women

This study tested the hypothesis that women patients with depression should perform movements more slowly and with greater variability, and their learning rate should be lower compared with age-matched healthy adult women. Three groups of adult women subjects (aged 33–37 years, women patients with mild and major depression and healthy adult women, n = 20 in each group) performed five series (20 repetitions in each series) of a speed–accuracy hand-movement task (SAT). The mean movement speed (V_a) of the SAT was lower and more stable (the coefficient of variation of V_a was lower) in women patients with major depression compared with those with minor depression and healthy adult women during the first series of the SAT. Only the V_a and movement accuracy (path of movement, S) of the SAT varied significantly in the five learning series regardless of the subject group (healthy women subjects and women patients with minor and major depression). The intraindividual variability of reaction time, V_a, maximal movement velocity to the target (tV_max), time to tV_max, and S did not change significantly in any of the groups. Our research data showed that although women patients with depression performed speed–accuracy movements more slowly, the stability of the performance of their movements and their learning rate did not differ from those of age-matched healthy adult women.     

Action naming in anomic aphasic speakers: effects of instrumentality and name relation

Many studies reveal effects of verb type on verb retrieval, mainly in agrammatic aphasic speakers. In the current study, two factors that might play a role in action naming in anomic aphasic speakers were considered: the conceptual factor instrumentality and the lexical factor name relation to a noun. Instrumental verbs were shown to be better preserved than non-instrumental verbs in a group of anomic aphasic speakers but not in a group of Broca's aphasic speakers. Name relation to a noun improved the performance of the anomic aphasic speakers as well. Again, no effect was found in the group of Broca's aphasic speakers. Verbs with a name relation to a noun were better retrieved in action naming than verbs without a name relation. These findings are discussed in terms of the spreading activation theory of Dell. (Dell, G. S. (1986). A spreading activation theory of retrieval in sentence production. Psychological Review 93, 283-321.).     

Variability in subcortical aphasia is due to variable sites of cortical hypoperfusion

A variety of fluent and nonfluent aphasias have been reported after left basal ganglia stroke. It has been speculated that this heterogeneity may reflect variations in cortical hypoperfusion resulting from large vessel stenosis. To test this hypothesis, a consecutive series of 24 patients with left caudate infarct identified with diffusion-weighted imaging underwent language testing and perfusion-weighted imaging < 24h from onset of symptoms. Specific regions in perisylvian cortex were rated for the percentage of the region that was hypoperfused. Aphasia type was determined on the basis of speech fluency, comprehension, and repetition performance on the language tests. Association between aphasia type/language impairment and regions of hypoperfusion were identified with Fisher's exact tests. Results demonstrated that in patients with acute left caudate infarct, the presence and type of aphasia reflected regions of hypoperfusion, and generally followed predictions based on chronic lesion studies, regarding anatomical lesions associated with classic aphasia types.