Olfactory dysfunction and its related molecular mechanisms in Parkinson's disease

Changes in olfactory function are considered to be early biomarkers of Parkinson's disease. Olfactory dysfunction is one of the earliest non-motor features of Parkinson's disease, appearing in about 90% of patients with early-stage Parkinson's disease, and can often predate the diagnosis by years. Therefore, olfactory dysfunction should be considered a reliable marker of the disease. However, the mechanisms responsible for olfactory dysfunction are currently unknown. In this article, we clearly explain the pathology and medical definition of olfactory function as a biomarker for early-stage Parkinson's disease. On the basis of the findings of clinical olfactory function tests and animal model experiments as well as neurotransmitter expression levels, we further characterize the relationship between olfactory dysfunction and neurodegenerative diseases as well as the molecular mechanisms underlying olfactory dysfunction in the pathology of early-stage Parkinson's disease. The findings highlighted in this review suggest that olfactory dysfunction is an important biomarker for preclinical-stage Parkinson's disease. Therefore, therapeutic drugs targeting non-motor symptoms such as olfactory dysfunction in the early stage of Parkinson's disease may prevent or delay dopaminergic neurodegeneration and reduce motor symptoms, highlighting the potential of identifying effective targets for treating Parkinson's disease by inhibiting the deterioration of olfactory dysfunction.

Astrocytic endothelin-1 overexpression impairs learning and memory ability in ischemic stroke via altered hippocampal neurogenesis and lipid metabolism

Vascular etiology is the second most prevalent cause of cognitive impairment globally. Endothelin-1, which is produced and secreted by endothelial cells and astrocytes, is implicated in the pathogenesis of stroke. However, the way in which changes in astrocytic endothelin-1 lead to poststroke cognitive deficits following transient middle cerebral artery occlusion is not well understood. Here, using mice in which astrocytic endothelin-1 was overexpressed, we found that the selective overexpression of endothelin-1 by astrocytic cells led to ischemic stroke-related dementia (1 hour of ischemia; 7 days, 28 days, or 3 months of reperfusion). We also revealed that astrocytic endothelin-1 overexpression contributed to the role of neural stem cell proliferation but impaired neurogenesis in the dentate gyrus of the hippocampus after middle cerebral artery occlusion. Comprehensive proteome profiles and western blot analysis confirmed that levels of glial fibrillary acidic protein and peroxiredoxin 6, which were differentially expressed in the brain, were significantly increased in mice with astrocytic endothelin-1 overexpression in comparison with wild-type mice 28 days after ischemic stroke. Moreover, the levels of the enriched differentially expressed proteins were closely related to lipid metabolism, as indicated by Kyoto Encyclopedia of Genes and Genomes pathway analysis. Liquid chromatography-mass spectrometry nontargeted metabolite profiling of brain tissues showed that astrocytic endothelin-1 overexpression altered lipid metabolism products such as glycerol phosphatidylcholine, sphingomyelin, and phosphatidic acid. Overall, this study demonstrates that astrocytic endothelin-1 overexpression can impair hippocampal neurogenesis and that it is correlated with lipid metabolism in poststroke cognitive dysfunction.

A review of the neurotransmitter system associated with cognitive function of the cerebellum in Parkinson's disease

The dichotomized brain system is a concept that was generalized from the 'dual syndrome hypothesis' to explain the heterogeneity of cognitive impairment, in which anterior and posterior brain systems are independent but partially overlap. The dopaminergic system acts on the anterior brain and is responsible for executive function, working memory, and planning. In contrast, the cholinergic system acts on the posterior brain and is responsible for semantic fluency and visuospatial function. Evidence from dopaminergic/cholinergic imaging or functional neuroimaging has shed significant insight relating to the involvement of the cerebellum in the cognitive process of patients with Parkinson's disease. Previous research has reported evidence that the cerebellum receives both dopaminergic and cholinergic projections. However, whether these two neurotransmitter systems are associated with cognitive function has yet to be fully elucidated. Furthermore, the precise role of the cerebellum in patients with Parkinson's disease and cognitive impairment remains unclear. Therefore, in this review, we summarize the cerebellar dopaminergic and cholinergic projections and their relationships with cognition, as reported by previous studies, and investigated the role of the cerebellum in patients with Parkinson's disease and cognitive impairment, as determined by functional neuroimaging. Our findings will help us to understand the role of the cerebellum in the mechanisms underlying cognitive impairment in Parkinson's disease.

The role of exosomes in adult neurogenesis: implications for neurodegenerative diseases

Exosomes are cup-shaped extracellular vesicles with a lipid bilayer that is approximately 30 to 200 nm in thickness. Exosomes are widely distributed in a range of body fluids, including urine, blood, milk, and saliva. Exosomes exert biological function by transporting factors between different cells and by regulating biological pathways in recipient cells. As an important form of intercellular communication, exosomes are increasingly being investigated due to their ability to transfer bioactive molecules such as lipids, proteins, mRNAs, and microRNAs between cells, and because they can regulate physiological and pathological processes in the central nervous system. Adult neurogenesis is a multistage process by which new neurons are generated and migrate to be integrated into existing neuronal circuits. In the adult brain, neurogenesis is mainly localized in two specialized niches: the subventricular zone adjacent to the lateral ventricles and the subgranular zone of the dentate gyrus. An increasing body of evidence indicates that adult neurogenesis is tightly controlled by environmental conditions with the niches. In recent studies, exosomes released from different sources of cells were shown to play an active role in regulating neurogenesis both in vitro and in vivo, thereby participating in the progression of neurodegenerative disorders in patients and in various disease models. Here, we provide a state-of-the-art synopsis of existing research that aimed to identify the diverse components of exosome cargoes and elucidate the therapeutic potential of exosomal contents in the regulation of neurogenesis in several neurodegenerative diseases. We emphasize that exosomal cargoes could serve as a potential biomarker to monitor functional neurogenesis in adults. In addition, exosomes can also be considered as a novel therapeutic approach to treat various neurodegenerative disorders by improving endogenous neurogenesis to mitigate neuronal loss in the central nervous system.

Motor constraints on infant search: The impact of reaching around a barrier on search performance

This study investigated the impact of perceptual-motor context on a classic paradigm used to assess cognitive-spatial reasoning. Specifically, this project explored the effect on search behavior of reaching around a barrier versus not reaching around a barrier during the A portion in the B phase of the well-known A-not-B task. In examining 8- and 16-month-old infants, this study found that both age groups demonstrated poorer performance on A trials when needing to reach around a barrier than when there was no barrier present. More interestingly, for the younger infants, needing to reach around a barrier on A trials led to better performance on B trials relative to infants who did not reach around a barrier. Older infants, however, showed no difference in B trial performance. These results demonstrate that inducing constraints on reaching (e.g., reaching around a barrier) has a significant impact on search behavior, a finding that theoretically fits with a literature demonstrating a fundamental role in behavior of perceptual and motor influences in A-not-B behavior.

The power of the written word: Comparing word meaning inferencing from auditory and written modalities throughout grade school

Previous research indicates that word learning from auditory contexts may be more effective than written context at least through fourth grade. However, no study has examined contextual differences in word learning in older school-aged children when reading abilities are more developed. Here we examined developmental differences in children's ability to deduce the meanings of unknown words from the surrounding linguistic context in the auditory and written modalities and sought to identify the most important predictors of success in each modality. A total of 89 children aged 8-15 years were randomly assigned to either read or listen to a narrative that included eight novel words, with five exposures to each novel word. They then completed three posttests to assess word meaning inferencing. Children across all ages performed better in the written modality. Vocabulary was the only significant predictor of success on the word inferencing task. Results indicate support for written stimuli as the most effective modality for novel word meaning deduction. Our findings suggest that the presence of orthographic information facilitates novel word learning even for early, less proficient readers.

Auditory attention influences trajectories of symbol-speech sound learning in children with and without dyslexia

The acquisition of letter-speech sound correspondences is a fundamental process underlying reading development, one that could be influenced by several linguistic and domain-general cognitive factors. In the current study, we mimicked the first steps of this process by examining behavioral trajectories of audiovisual associative learning in 110 7- to 12-year-old children with and without dyslexia. Children were asked to learn the associations between eight novel symbols and native speech sounds in a brief training and subsequently read words and pseudowords written in the artificial orthography. We then investigated the influence of auditory attention as one of the putative domain-general factors influencing associative learning. To this aim, we assessed children with experimental measures of auditory sustained selective attention and interference control. Our results showed shallower learning trajectories in children with dyslexia, especially during the later phases of the training blocks. Despite this, children with dyslexia performed similarly to typical readers on the post-training reading tests using the artificial orthography. Better auditory sustained selective attention and interference control skills predicted greater response accuracy during training. Sustained selective attention was also associated with the ability to apply these novel correspondences in the reading tests. Although this result has the limitations of a correlational design, it denotes that poor attentional skills may constitute a risk during the early stages of reading acquisition, when children start to learn letter-speech sound associations. Importantly, our findings underscore the importance of examining dynamics of learning in reading acquisition as well as individual differences in more domain-general attentional factors.

Truthful yet misleading: Elementary second-order deception in school-age children and its sociocognitive correlates

In highly competitive contexts, deceptive intentions might be transparent, so conveying only false information to the opponent can become a predictable strategy. In such situations, alternating between truths and lies (second-order lying behavior) represents a less foreseeable option. The current study investigated the development of 8- to 10-year-old children's elementary second-order deception in relation to their attribution of ignorance (first- and second-order ignorance) and executive functions (inhibitory control, shifting ability, and verbal working memory). An adapted version of the hide-and-seek paradigm was used to assess children's second-order lie-telling, in which children were asked to hide a coin in either of their hands. Unlike the standard paradigm, the opponent did not consistently look for the coin in the location indicated by the children, so children needed to switch between telling simple lies and truths (elementary second-order lies about the coin location) to successfully deceive the recipient. The results showed that older children were less likely to tell elementary second-order lies. However, across the sample, when children decided to lie, this ability was positively related to their second-order ignorance attribution and their verbal working memory. Moreover, we obtained preliminary evidence for the presence of a habituation effect in second-order lying, with children being more accurate and having less variability in their truthful-to-deceive responses (this being the more frequently elicited response) than when telling lies to deceive. Our findings could have implications for understanding the mechanisms underlying children's ability to alternate between truths and lies to deceive.

Shame, depression, and complicated grief among suicide loss-survivors: the moderating role of self-disclosure

Background: Suicide-loss survivors (SLSs) are recognised as an at-risk population for several psychiatric complications, including complicated grief (CG) and depression (SI). However, whereas shame is known as one of the characteristics of this population, knowledge about possible psychological processes which may moderate the contribution of shame levels to CG and depression in the aftermath of suicide loss is sparse. This study examines the role of self-disclosure - the inclination to share personal information with others - as a possible moderator of the associations of shame with CG and shame with depression over time.Method: Participants were 152 suicide-loss survivors, aged 18-70, who completed questionnaires tapping CG and depression at three time points (T1- index measurement, T2-two years after T1. and T3-four years after T1) and questionnaires tapping shame and SD at T3.Results: Hierarchical regression analyses showed that shame significantly and positively contributed to CG at T3 and to depression at T3, beyond the CG/depression trajectories. Notably, two significant interactions were found: Self-disclosure moderated the contribution of shame to CG at T3 and to depression at T3. At lower self-disclosure levels, shame's contribution to CG and depression was higher.Conclusion: The study's findings highlight shame as a significant facilitator of CG and depression in the aftermath of suicide loss. Moreover, the role of interpersonal interaction on SLSs' distress levels and grieving process was underscored, as this interaction may serve as a buffer against the deleterious sequelae of the suicide of a loved one.

Self-efficacy and locus of control as transdiagnostic factors in Middle Eastern refugees

Background: Many refugees report high levels of psychopathology. As a countermeasure, some psychological interventions aim at targeting mental health difficulties in refugees transdiagnostically. However, there is a lack of knowledge about relevant transdiagnostic factors in refugee populations.Objective: To inform intervention efforts empirically, we investigated whether self-efficacy and locus of control are transdiagnostically associated with symptoms of depression, anxiety, somatisation, psychological distress, and a higher-order psychopathology factor ('p') in Middle Eastern refugees residing in Germany.Method: In total, 200 Middle Eastern refugees took part in this cross-sectional study, comprising 160 male and 40 female refugees. Participants were, on average, 25.56 years old (SD = 9.19), and 182 (91%) originally came from Syria, while remaining refugees were from Iraq or Afghanistan. They completed measures of depression, anxiety, somatisation, self-efficacy, and locus of control.Results: In multiple regression models adjusting for demographic factors (gender and age), self-efficacy and external locus of control were transdiagnostically related to depression, anxiety, somatic symptoms, psychological distress, and a higher-order psychopathology factor. Internal locus of control had no detectable effect in these models.Conclusions: Self-efficacy and external locus of control appear critical in the mental health of refugees and may be important mechanisms in overcoming posttraumatic stress and resettlement stressors. Our findings support the need to target self-efficacy and external locus of control as transdiagnostic factors of general psychopathology in Middle Eastern refugees.

Assessing the role of depression in reducing intimate partner violence perpetration among young men living in urban informal settlements using a mediation analysis of the Stepping Stones and Creating Futures intervention

BACKGROUND

Stepping Stones and Creating Futures (SS/CF) is a gender transformative and economic empowerment intervention that has effectively reduced the perpetration of intimate partner violence (IPV) by young men living in informal settlements in South Africa.

OBJECTIVE

This study examines whether depression mediated the association between SS/CF intervention and decreased IPV.

METHOD

Data from a two-arm cluster randomised community-based controlled trial that evaluated the effectiveness of SS/CF in lowering IPV were obtained from 674 young men aged 18-30 within urban informal settlements in South Africa. After being randomly assigned to either the experimental arm (SS/CF) or the control arm, the participants were followed up for 24 months. Logistic regression using mediation analysis was conducted to see whether changes in depressive symptoms mediated the association between the intervention and reduced IPV perpetration.

RESULTS

Findings from the mediation analysis indicated that those assigned to the SS/CF experimental group reported lower depression (β = -0.42, p < 0.05) at 12 months, and this was subsequently associated with reduced IPV (β = 0.43, p < 0.05) at 24 months. The direct path from SS/CF to IPV was originally (β = -0.46, p < 0.01), but reduced in the mediation model to (β = -0.13, p = 0.50). Depressive symptoms mediated the association between the SS/CF intervention and decreased IPV perpetration.

CONCLUSION

These findings suggest that one pathway through which SS/CF decreased IPV was through improvement in mental health (i.e. depression). Future IPV prevention interventions may consider incorporating components that focus on improving mental health as a way of also reducing IPV perpetration in disadvantaged settings.

Assessing the effectiveness of a sexual and reproductive health and rights training programme in changing healthcare practitioners' attitudes and practices in low-income countries

INTRODUCTION

In low-income countries the utilisation of sexual and reproductive health and rights (SRHR) services is influenced by healthcare practitioners' knowledge, attitudes and practices. Despite awareness of the potential problems due to ingrained biases and prejudices, few approaches have been effective in changing practitioners' knowledge, attitudes and practices concerning SRHR in low-income countries.

OBJECTIVES

1) To assess whether participating in an SRHR international training programme (ITP) changed healthcare practitioners' SRHR knowledge, SRHR attitudes and SRHR practices and 2) examine associations between trainees' characteristics, their SRHR work environment and transfer of training.

METHODS

A pre- and post-intervention study, involving 107 trainees from ten low-income countries, was conducted between 2017 and 2018. Paired samples t-test and independent samples t-test were used to assess differences between trainees' pre- and post-training scores in self-rated SRHR knowledge, attitudes, knowledge seeking behaviour and practices. Linear regression models were used to examine association between trainees' baseline characteristics and post-training attitudes and practices.

RESULTS

Trainees' self-rated scores for SRHR knowledge, attitudes and practices showed statistically significant improvement. Baseline high SRHR knowledge was positively associated with improvements in attitudes but not practices. High increases in scores on knowledge seeking behaviour were associated with higher practice scores. No statistically significant associations were found between scores that measured changes in SRHR knowledge, attitudes and practices.

CONCLUSION

The findings indicate that the ITP was effective in improving trainees' self-rated scores for SRHR knowledge, attitudes and behaviours (practices). The strongest association was found between improvement in SRHR knowledge seeking behaviour and the improvement in SRHR practices. This suggests that behaviour intention may have a central role in promoting fair open-minded SRHR practices among healthcare practitioners in low-income countries.

Assessment of hepatitis-related knowledge, attitudes, and practices on quality of life with the moderating role of internalized stigma among hepatitis B-positive patients in Pakistan

Aim

This study aimed to assess the Pakistani hepatitis B patients' knowledge, attitudes, and practices towards hepatitis management and the impact of self-management on the quality of life of hepatitis B patients as well as the moderating role of stigmatization.

Methods

A cross-sectional study design was used, and the data was collected from a total of 432 hepatitis B positive patients through a self-designed questionnaire. The studied subjects consisted of men (n = 205, 47%), women (n = 165, 38%), and transgender (n = 62, 14%). The obtained data were statistically analyzed using SPSS software version 26.0 for Windows.

Results

The mean age of the study participants was 48. Knowledge has a significant positive relationship with hepatitis self-management and quality of life, whereas knowledge has a negative relationship with stigmatization. Furthermore, multivariate analysis revealed that men were more knowledgeable about the disease than women and transgender people (6.14 ± 2.08 vs. 3.23 ± 1.61 vs. 1.03 ± 0.73, F = 8.2**, p = .000). On the scale of attitude and practice, significant gender differences were found. Women had more experience with hepatitis self-management than men or transgender (4.21 ± 13.0 vs. 2.17 ± 6.02 vs. 0.37 ± 0.31, F = 6.21**, p = .000). The regression analysis showed that self-management has a positive association with quality of life (B = 0.36, p = .001). The moderation analysis revealed that stigmatization negatively moderates the relationship between self-management and quality of life (B = -0.53, p = .001).

Conclusion

Generally, patients had good knowledge about the disease and its self-management. However, a societal and community-level awareness campaign should be organized on the quality of life and stigmatization of people with chronic illness regarding their human rights, dignity, and physical, mental, and social well-being.

Trauma exposure and psychometric properties of the life events checklist among adults in South Africa

Background: Trauma exposure is widespread and linked to chronic physical and mental health conditions including posttraumatic stress disorder. However, there are major gaps in our knowledge of trauma exposure in Africa and on the validity of instruments to assess potentially life-threatening trauma exposure.Objective: The Life Events Checklist for the DSM-5 (LEC-5) is a free, widely used questionnaire to assess traumatic events that can be associated with psychopathology. As part of a case-control study on risk factors for psychosis spectrum disorders, we used the LEC-5 to examine the frequency of traumatic events and to assess the questionnaire's factor structure in South Africa (N = 6,765).Method: The prevalence of traumatic events was measured by individual items on the LEC-5 across the study sample, by case-control status, and by sex. Cumulative trauma burden was calculated by grouping items into 0, 1, 2, 3, and ≥4 traumatic event types. Psychometric properties of the LEC-5 were assessed through exploratory and confirmatory factor analyses.Results: More than 92% of the study sample reported experiencing ≥1 traumatic event; 38.7% reported experiencing ≥4 traumatic event types. The most endorsed item was physical assault (65.0%), followed by assault with a weapon (50.2%). Almost 94% of cases reported ≥1 traumatic event compared to 90.5% of controls (p < .001) and 94% of male participants reported ≥1 traumatic event compared to 89.5% of female participants (p < .001). Exploratory factor analysis revealed a 6-factor model. Confirmatory factor analyses of three models found that a 7-factor model based on the South African Stress and Health survey was the best fit (standardized root mean square residual of 0.024, root mean square error of approximation of 0.029, comparative fit index of 0.910).Conclusion: Participants reported very high exposure to traumatic events. The LEC-5 has good psychometric priorities and is adequate for capturing trauma exposure in South Africa.

Reviewing the neurobiology of electroconvulsive therapy on a micro- meso- and macro-level

BACKGROUND

Electroconvulsive therapy (ECT) remains the one of the most effective of biological antidepressant interventions. However, the exact neurobiological mechanisms underlying the efficacy of ECT remain unclear. A gap in the literature is the lack of multimodal research that attempts to integrate findings at different biological levels of analysis METHODS: We searched the PubMed database for relevant studies. We review biological studies of ECT in depression on a micro- (molecular), meso- (structural) and macro- (network) level.

RESULTS

ECT impacts both peripheral and central inflammatory processes, triggers neuroplastic mechanisms and modulates large scale neural network connectivity.

CONCLUSIONS

Integrating this vast body of existing evidence, we are tempted to speculate that ECT may have neuroplastic effects resulting in the modulation of connectivity between and among specific large-scale networks that are altered in depression. These effects could be mediated by the immunomodulatory properties of the treatment. A better understanding of the complex interactions between the micro-, meso- and macro- level might further specify the mechanisms of action of ECT.

Brain structural alterations in internet gaming disorder: Focus on the mesocorticolimbic dopaminergic system

AIMS

This study aimed to identify gray/white matter volume (GMV/WMV) alterations in Internet Gaming Disorder (IGD), with a special focus on the subregions of the mesocorticolimbic dopaminergic system and their clinical association.

RESULTS

Compared with healthy controls, IGDs showed bigger GMV in the bilateral caudate and the left nucleus accumbens (NAc), and bigger WMV in the inferior parietal lobule. The comparison of regions of interest (ROI) confirmed increased GMV in the bilateral caudate (including the dorsal anterior, body, and tail) and the left core of NAc in IGD, but no significant WMV alterations in the mesocorticolimbic dopaminergic system. GMVs in the left lateral orbital gyrus of orbitofrontal cortex (OFC) were associated with craving for games, while GMVs in the left anterior insula, right NAc, right caudate, and right OFC were associated with self-control in IGD.

CONCLUSIONS

IGD was accompanied by changed GMV, but not WMV, in the mesocorticolimbic dopaminergic system. GMV in the mesocorticolimbic dopaminergic system may contribute to impaired self-control and craving in IGD.

Remote neurocognitive interventions for attention-deficit/hyperactivity disorder - Opportunities and challenges

Improving neurocognitive functions through remote interventions has been a promising approach to developing new treatments for attention-deficit/hyperactivity disorder (AD/HD). Remote neurocognitive interventions may address the shortcomings of the current prevailing pharmacological therapies for AD/HD, e.g., side effects and access barriers. Here we review the current options for remote neurocognitive interventions to reduce AD/HD symptoms, including cognitive training, EEG neurofeedback training, transcranial electrical stimulation, and external cranial nerve stimulation. We begin with an overview of the neurocognitive deficits in AD/HD to identify the targets for developing interventions. The role of neuroplasticity in each intervention is then highlighted due to its essential role in facilitating neuropsychological adaptations. Following this, each intervention type is discussed in terms of the critical details of the intervention protocols, the role of neuroplasticity, and the available evidence. Finally, we offer suggestions for future directions in terms of optimizing the existing intervention protocols and developing novel protocols.

Patient and caregiver questions and clinician responses during initial outpatient neuropalliative care appointments

Objective

Open communication during appointments exemplifies person-centered care. The current study characterized questions asked by persons with neurologic illnesses and their caregivers-and clinicians' responses to those questions-during initial outpatient palliative care appointments.

Methods

We coded type (direct or indirect) and topic of questions stated by patients and their caregivers in audio recordings from 38 initial outpatient palliative care appointments. We also coded the completeness and quality features of clinicians' responses.

Results

Patients and caregivers stated 556 total questions; most were direct questions (79.7%) and primarily about symptoms, treatment, and lifestyle issues. Clinicians responded to more than 90% of all questions. Responses to both question types were similar in completeness and quality, but clinicians more frequently offered support in response to direct questions and gave recommendations in response to indirect questions.

Conclusion

Persons with neurologic illnesses and their caregivers use different question types to obtain information about symptoms and treatment during initial palliative care appointments. Results may guide clinician training and patient education for optimizing information exchange in palliative care.

Innovation

This study is the first to explore patient and caregiver use of indirect questions in neuropalliative care appointments and the quality of clinicians' responses to those questions.

Cancer caregivers at the end-of-life: How much me vs. how much we?

OBJECTIVE

This study explored cancer caregivers' individual and communal coping through their use of personal and communal pronouns during naturally occurring conversations.

METHODS

Nurse-home hospice visits involving cancer patients and their partner caregivers were audio recorded and then transcribed. Pronoun use was analyzed using Linguistic Inquiry Word Count (LIWC) software and descriptive statistics compared patient and partner caregivers' pronoun use. Personal and communal pronoun use was examined within six identified topics of caregiver speech: patient medical care, daily life, emotion, criticism/disagreement, relationships with family/friends, and asserting needs.

RESULTS

Dyads (N = 76) had an average of 35.8 years in their relationship. Caregivers used proportionately more first-person singular (I-talk) than first-person plural (we-talk). However, they used significantly less I-talk than patients and less I-talk than LIWC measures in naturally occurring speech. Caregivers were most likely to discuss patient medical care (41.9%) and least likely to discuss their own needs (3.8%).

CONCLUSION

Partner caregivers may find it easier to express emotions related to communal stressors, rather than their individual ability to cope with end-of-life caregiving.

INNOVATION

Examining personal and communal pronoun use by partner caregivers during nurse-home hospice visits may provide a more objective measure of caregiver coping than standard self-report measures.

Talk outside the box: Parents' decontextualized language during preschool years relates to child numeracy and literacy skills in middle childhood

Children's literacy and numeracy skills are fundamental for early academic performance and later academic success, mental health, and employment prospects in adulthood. Given that parents play a key role in promoting child development, identifying early parenting behaviors that predict literacy and numeracy skills is a research imperative. Emerging evidence suggests that parental use of decontextualized language (DL)-talk that requires cognitive abstraction and transcends the here and now-predicts children's literacy skills. However, its relation to numeracy remains underexplored. Accordingly, the current study examined how DL during interaction with children in infancy (T1) and preschool years (T2) relates to child literacy and numeracy in middle childhood (T3). Participants were 26 Irish mother-father-child triads (16 female children). At T1 and T2, participants engaged in 5-min interactions that were coded for DL. At T3, child literacy and numeracy were assessed using the Wechsler Intelligence Scale for Children-Fourth Edition and teacher report of child scores on national standardized tests. Controlling for child age and contextualized utterances, child reading in middle childhood was negatively related to maternal and child DL in infancy but was positively related to DL during preschool years, suggesting that the benefits of DL may become apparent later in development. Mothers', fathers', and children's DL during preschool years was also positively linked with child numeracy in middle childhood. Thus, embedding DL in conversation with children may have positive domain-specific and cross-domain effects on children's literacy and numeracy performance. Findings provide incentive for future research to examine relations between DL and children's school performance across a wider range of developmental domains.

Effect of COGNI-MACHINE computational thinking training on executive functions in children aged 9 to 11: Protocol of a cluster randomized controlled trial

We designed a controlled trial protocol that seeks to contribute to cognitive science by studying the effect of thought training on children's executive functions. The study design is a cluster randomized controlled trial, with intra-subject and inter-subject evaluation, with two parallel groups: an experimental group and a TAU control group. With three measures, pre-test, post-test, and follow-up after three months. The participants will be children aged 9 to 11. The allocation will be randomized by groups and not individually. The sample will be a minimum of 44 participants. The primary measures will be neuropsychological tests to assess executive functions. Secondary measures will be a computational thinking test, neuropsychological tests to assess metacognition and attention, and an acceptability scale. The experimental group will participate in the COGNI-MACHINE computational thinking training designed by the first author. The training frequency will be twice a week in 60 min sessions for 12 weeks. The TAU control group will receive computer science classes as usual during the same time as the experimental group. The evaluators taking the measurements will be blinded to the assignment. The investigators in charge of the intervention will be blinded to the results of the evaluations.

Social causation, social selection, and economic selection in the health outcomes of Chinese older adults and their gender disparities

Background

The economic selection hypothesis, which argues that the initial economic situation determines both subsequent health and economic conditions, has been drawn into the debate on causation-selection issues. This study aims to construct a path model with self-rated health and depression score of older adults as health outcomes to measure and compare the social causation forces of wealth accumulation, social selection forces of adulthood health, and economic selection forces of childhood economics, and to examine their gender disparities.

Methods

Data was obtained from a sample of 19613 older adults aged 45 years or above from the 2014 life history survey and the 2015 routine follow-up survey of the China Health and Retirement Longitudinal Study. Structural equation modeling analysis was conducted employing the full information maximum likelihood estimation method.

Results

The presence of social causation, social selection, and economic selection were all statistically supported. In self-rated health, social selection forces held the dominant position, while social causation forces were comparable to economic selection forces. In depression score, social selection still exhibited stronger forces than economic selection, but social causation had forces close to social selection and greater than economic selection. The forces of the three hypotheses in self-rated health did not significantly change with gender, but social causation exerted mightier forces than economic selection within the male group, unlike the female group. The forces of economic selection in depression score were greater in females than males and no significant differences were observed among the forces of the three hypotheses in the female group.

Conclusions

Social causation, social selection, and economic selection operate simultaneously on the self-rated health and depression score of older adults. However, the force magnitudes of the three hypotheses and/or their rankings differ by health outcomes and gender.

Fatty acid-binding protein 5 differentially impacts dopamine signaling independent of sex and environment

Epidermal/brain fatty acid-binding protein 5 (FABP5) plays an integral role in the intracellular trafficking of bioactive lipids/endocannabinoids and the subsequent initiation of cellular cascades affecting cannabinoid and dopamine (DA) systems. Social isolation (SI) and environmental enrichment (EE) during adolescence have been shown to impact DA signaling, and, specifically, DA transporter (DAT) and receptor levels of DA type 1 (D1) and 2 (D2); however, the relationship between FABP5, environment and DA signaling remains unclear. The present study quantified DAT and DA receptor levels in male/female FABP5-/- and FABP5+/+ mice raised in either SI or EE. Results showed that FABP5-/- mice had 6.09-8.81% greater D1 levels in striatal sub-regions of the caudal brain, independent of sex or environment. D1 levels were 8.03% greater only in the olfactory tubercle of enrichment-reared animals. In summary, these results supported that FABP5 plays an important function in regulating striatal DA signaling, and this may have important implications as a target with therapeutic potential for various psychiatric disorders.