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The New Jersey Kids Study (NJKS) is a transdisciplinary statewide initiative to understand influences on child health, development, and disease. We conducted a mixed-methods study of project planning teams to investigate team effectiveness and relationships between team dynamics and quality of deliverables.
Methods:
Ten theme-based working groups (WGs) (e.g., Neurodevelopment, Nutrition) informed protocol development and submitted final reports. WG members (n = 79, 75%) completed questionnaires including de-identified demographic and professional information and a modified TeamSTEPPS Team Assessment Questionnaire (TAQ). Reviewers independently evaluated final reports using a standardized tool. We analyzed questionnaire results and final report assessments using linear regression and performed constant comparative qualitative analysis to identify central themes.
Results:
WG-level factors associated with greater team effectiveness included proportion of full professors (β = 31.24, 95% CI 27.65–34.82), team size (β = 0.81, 95% CI 0.70–0.92), and percent dedicated research effort (β = 0.11, 95% CI 0.09–0.13); age distribution (β = −2.67, 95% CI –3.00 to –2.38) and diversity of school affiliations (β = –33.32, 95% CI –36.84 to –29.80) were inversely associated with team effectiveness. No factors were associated with final report assessments. Perceptions of overall initiative leadership were associated with expressed enthusiasm for future NJKS participation. Qualitative analyses of final reports yielded four themes related to team science practices: organization and process, collaboration, task delegation, and decision-making patterns.
Conclusions:
We identified several correlates of team effectiveness in a team science initiative's early planning phase. Extra effort may be needed to bridge differences in team members' backgrounds to enhance the effectiveness of diverse teams. This work also highlights leadership as an important component in future investigator engagement.
To determine and compare the intraoperative durability of 4 major surgical glove brands.
Design, Setting, and Participants:
This study is a randomized open-label clinical trial in which surgical gloves from 4 manufacturers are randomized to 5 surgical subspecialty study groups: (1) orthopedic surgery, (2) neurosurgery, (3) colorectal surgery, (4) trauma or acute general surgery, and (5) cardiac and plastic surgeries. The study was divided into 10 periods, with a cross-over design, and was conducted at a tertiary care academic medical center. Participants were licensed and certified physicians, physicians-in-training, scrub nurses, or technicians working within the sterile field.
Interventions:
Participants from each study group were randomly assigned to 1 of 4 surgical glove manufacturer types and subsequently rotated through the other 3 glove brands such that each participant acted as their own control in the sequential cross-over design.
Main Outcomes and Measures:
The primary outcome was to determine and compare the intraoperative failure rate of Biogel® Sterile Surgical undergloves against sterile surgical undergloves from 3 other manufacturers, both as a combined competitor group and individually.
Results:
There were no differences between brands with respect to the primary outcome of underglove intraoperative failures. Brand 1 wearers were slightly more likely to detect glove failures when they occurred.
Conclusion:
The durability of surgical gloves intraoperatively is similar across 4 major glove manufacturers. Detection of intraoperative failures is infrequent, though specific glove characteristics may promote enhanced detection. Recognition of glove perforations intraoperatively is important in the maintenance of a maximally sterile field.
The U.S. Department of Veterans Affairs is actively transitioning away from a disease-centric model of healthcare to one that prioritizes disease prevention and the promotion of overall health and well-being. Described as Whole Health, this initiative aims to provide personalized, values-centered care that optimizes physical, behavioral, spiritual, and socioeconomic well-being. To inform this initiative, we analyzed cross-sectional data from a nationally representative sample of primarily older U.S. military veterans to estimate levels of well-being across these domains, and identify sociodemographic, military, and potentially modifiable health and psychosocial correlates of them. Results revealed that, overall, veterans reported high domain-specific well-being (average scores ranging from 6.7 to 8.3 out of 10), with the highest levels in the socioeconomic domain and lowest in the physical domain. Several modifiable factors, including purpose in life, resilience, and social support, were strongly associated with the examined well-being domains. Interventions targeting these constructs may help promote well-being among U.S. veterans.
The prioritization of English language in clinical research is a barrier to translational science. We explored promising practices to advance the inclusion of people who speak languages other than English in research conducted within and supported by NIH Clinical Translational Science Award (CTSA) hubs. Key informant interviews were conducted with representatives (n = 24) from CTSA hubs (n = 17). Purposive sampling was used to identify CTSA hubs focused on language inclusion. Hubs electing to participate were interviewed via Zoom. Thematic analysis was performed to analyze interview transcripts. We report on strategies employed by hubs to advance linguistic inclusion and influence institutional change that were identified. Strategies ranged from translations, development of culturally relevant materials and consultations to policies and procedural changes and workforce initiatives. An existing framework was adapted to conceptualize hub strategies. Language justice is paramount to bringing more effective treatments to all people more quickly. Inclusion will require institutional transformation and CTSA hubs are well positioned to catalyze change.
In the absence of treatments to halt or reverse symptoms of Alzheimer's disease, early detection may extend the window for meaningful treatment, advanced planning, and coping. Positron emission tomography (PET) scans for amyloid and tau are validated biomarkers of AD, yet results are rarely disclosed to participants due to concerns about negative impacts. While prior studies suggest limited anxiety, depression, or suicidality following biomarker disclosure, no study to date has examined broader psychological impacts of PET amyloid/tau disclosure to symptomatic individuals. Therefore, we explored post-disclosure changes in future time perspective (perceptions of limited time or possibilities left in the future), self-efficacy for managing symptoms, and perceived stigma as a function of result received.
Participants and Methods:
Forty-three older adults (age = 72.0±6.2 years; education = 16.5±2.6; 88.4% White Non-Hispanic; 48.8% female) participated in the study, of whom 62.8% were diagnosed with mild cognitive impairment (MCI) and the remainder with Dementia of the Alzheimer's type. All participants underwent pre-disclosure biomarker education and decisional capacity assessment, followed by baseline measures. Participants demonstration decisional capacity completed an interactive disclosure session during which they received dichotomous results of their research positron emission tomography (PET) scans for amyloid and tau (elevated versus not elevated for each biomarker). Findings were discussed in relation to presence/absence of Alzheimer's disease, the etiology of their cognitive difficulties, and risk for conversion or further decline. At baseline, immediately following disclosure, and at 1-week follow-up, participants completed several questionnaires: the Future Time Perspective (FTP) scale, a measure of how much the participant sees time as limited, the Self Efficacy for Managing Chronic Disease scale (SECD), and the Stigma Scale for Chronic Illness (SSCI-8), all of which were modified to apply to Alzheimer's disease and associated experiences.
Results:
The main effects of time (F=1.10, p=.334, A?p2=.026), biomarker status (F(1)=3.10, p=.086, Ajp2=.070), and the time by biomarker status interaction (F=0.39, p=.661, Ajp2=.009) on FTP score was not significant. Though neither time (F=0.07, p=.933, A?p2=.002) nor the time by biomarker status interaction (F=2.16, p=.122, Ajp2=.050) effect on SECD was significant, being biomarker positive (A+T-/A+T+) was associated with lower self-efficacy (F(1)=5.641, p=.022, Ajp2=.121). Neither main effect for time (F=0.15, p=.853, Ajp2=.004) or biomarker status (F(1)=0.35, p=.558, A?p2=.009) on SSCI-8 was significant. The time by biomarker status interaction was significant (f=4.27, p=.018, =.096), such that biomarker negative participants experience a transient increase in perceived stigma directly after disclosure that resolves one week later, and biomarker negative participants experience the opposite pattern.
Conclusions:
Findings suggest that individuals who receive biomarker positive results may feel less competent to manage their symptoms compared to those who are biomarker negative, emphasizing the need for post-disclosure interventions targeting self-efficacy. The effect of disclosure on perceptions of time being limited and on perceived stigma were minimal, even when those results indicate evidence of Alzheimer's disease and risk for clinical progression. These results further support the safety of biomarker disclosure procedures. Future studies should provide longer-term assessment of psychological, behavioral, and clinical outcomes following Alzheimer's disease biomarker disclosure.
Cognitive difficulties are amongst the most frequently reported sequelae following COVID-19 infection, even in those experiencing mild to moderate illness (Matos et al., 2021). Recent research has identified patterns of diminished cognitive performance on tests of memory and executive functioning in COVID-19 cases; however, the etiology of neurocognitive difficulties remains unclear (Delgado-Alonso et al., 2022). Emerging evidence has identified moderate associations between decreased performance on neuropsychological tests of memory and elevated anxiety and depression symptom reporting in COVID-19 patients. Similar associations are well-established in the literature in persons with anxiety and depression disorders, warranting further investigation as to whether mental health variables such as internalizing symptom severity may moderate the association between COVID-19 illness and cognitive difficulties. This study examined how internalizing symptoms as indexed by depression and anxiety symptom scales may differentially influence performance on neuropsychological tests of memory between persons who have and have not had COVID-19.
Participants and Methods:
In this cross-sectional study, 104 adults aged 19-80, were recruited in Ontario and British Columbia, Canada; 84 adults met inclusion criteria and participated in neuropsychological testing. There were 40 participants who tested positive for COVID-19 infection (N=44 with no suspected exposures or confirmed diagnosis of COVID-19). Participants had no history of dementia, mild cognitive impairment, or other known neurological disorder. Anxiety and depression symptoms were measured using the Generalized Anxiety Disorder-7 (GAD-7) and Center for Epidemiologic Studies Depression Scale (CES-D) via self-report on Qualtrics. Memory encoding and delayed recognition performance were assessed using the Hopkins Verbal Learning Test Revised (HVLT-R) and the Neuropsychological Assessment Battery Shape Learning subtest (NAB-SL). To test for potential moderating effects of anxiety and depression symptoms on the association between COVID-19 infection status and memory performance, a series of multiple linear regressions were conducted. Age and sex were included as covariates in all analyses.
Results:
Moderation analyses revealed that the interaction between COVID-19 infection and anxiety symptoms accounted for a significant portion of variance in both HVLT-R recognition (B= -0.78, SE= 0.34, p<0.05) and NAB-SL delayed recognition scores (B= -0.83, SE= 0.35, p<0.05). Simple slopes analyses revealed that among participants who tested positive for COVID-19 infection, higher GAD-7 scores were associated with lower verbal and visual recognition scores. A similar interaction was observed between COVID-19 and depressive symptoms in accounting for variance in NAB-SL delayed recognition scores, however, for that model the threshold of p=0.05 was not met in our small sample (p=0.07).
Conclusions:
Findings demonstrate that anxiety symptom severity had a moderating effect on the impact of COVID-19 on delayed retrieval of verbal and visual information from memory. Future work in a larger sample is needed to further elucidate the potential moderating role of depression on memory in COVID-19 positive persons, as the current work suggests that depression symptoms could have a similar impact as anxiety. Further identifying the relationships between key modifiable psychological factors such as anxiety and memory following COVID-19 infection will provide insight into potential interventions to minimize the negative effects of internalizing symptoms on long-term cognitive outcomes.
There are many potential benefits of early identification of those with Alzheimer’s disease (AD), including more opportunity for early intervention to slow AD progression (e.g., treatment, lifestyle changes, etc.) and to plan for the future. Positron emission tomography (PET) scans for abnormal amyloid and tau are commonly conducted in research settings. Despite strong interest in learning AD biomarker results, participants rarely receive their research data, in part due to concern about the possibility of undue distress based on results. We aimed to explore both positive and negative emotional reactions following PET biomarker disclosure as a function of result received.
Participants and Methods:
Forty-three older adults (age = 72.0±6.21 years, education = 16.5±2.62 years, 49% Female, 88% White Non-Hispanic) completed PET amyloid and tau testing and disclosure. Sixty-three percent were diagnosed with mild cognitive impairment (MCI) while the remainder of participants were diagnosed with Dementia Alzheimer’s type (DAT). Participants completed pre-disclosure biomarker education and a decisional capacity assessment followed by baseline measures. Participants then completed a disclosure session where they received personal PET amyloid and tau results on an elevated vs. not elevated scale for each ligand. Results were discussed in relation to presence/absence of Alzheimer’s disease, how the result relates to their cognitive difficulties, and risk of developing Dementia-Alzheimer’s Type. At baseline (pre-disclosure), immediately post-disclosure, and 1-week post-disclosure, participants completed the Beck Anxiety Inventory (BAI), The Geriatric Depression Scale - 15 Item (GDS-15), Impact of Neuroimaging in AD (INI-AD) Scale, and the Positive and Negative Affective Scale - Short Form (PANAS-SF). All questionnaires were modified to apply to Alzheimer’s disease and related experiences.
Results:
Of the 43 participants who participated in disclosure, 74% received biomarker positive results (either A+T- or A+T+); all others were biomarker negative. We conducted a series of mixed analysis of variance (ANOVA) tests to determine the effect of disclosure and biomarker status for each of the outcomes of interest. Neither the effect of time nor the time by biomarker status interaction was significant for any of the outcomes (all p>.05). The main effect of biomarker status was significant for BAI (F(1)=5.12, p=.031, n,p2=.146) and INI-AD Distress (F(1)=12.70, p=.001, np2=.241) and Positive (F(1)=34.57, p<.001, np2=.464) subscale scores with A+T-/A+T+ participants reporting higher negative affect than those who were A-/T-; however, even among biomarker positive individuals, scores did not exceed clinical thresholds. GDS-15, PANAS-Negative and Positive Subscale scores did not differ significantly by biomarker status (all p>.05) and no significant adverse events occurred following disclosure. Additionally, no participants cited regret about receiving their results.
Conclusions:
While disclosure of biomarker positivity may result in mild increases in acute anxiety or distress, or fewer positive emotions, it does not result in clinically significant emotional reactions and was not associated with regret. Overall, findings are consistent with literature indicating safety of biomarker disclosure procedures for symptomatic individuals. Future research should follow participants over longer periods to evaluate the impacts of biomarker disclosure.
Neurocognitive deficits commonly occur following pediatric stroke and can impact many neuropsychological domains. Despite awareness of these deleterious effects, neurocognitive outcome after pediatric stroke, especially hemorrhagic stroke, is understudied. This clinical study aimed to elucidate the impact of eight factors identified in the scientific literature as possible predictors of neurocognitive outcome following pediatric stroke: age at stroke, stroke type (i.e., ischemic vs. hemorrhagic), lesion size, lesion location (i.e., brain region, structures impacted, and laterality), time since stroke, neurologic severity, seizures post-stroke, and socioeconomic status.
Participants and Methods:
Ninety-two patients, ages six to 25 and with a history of pediatric stroke, chose to participate in the study and were administered standardized neuropsychological tests assessing verbal reasoning, abstract reasoning, working memory, processing speed, attention, learning ability, long-term memory, and visuomotor integration. A standardized parent questionnaire provided an estimate of executive functioning. Statistical analyses included spline regressions to examine the impact of age at stroke and lesion size, further divided by stroke type; a series of one-way analysis of variance to examine differences in variables with three levels; Welch’s t-tests to examine dichotomous variables; and simple linear regressions for continuous variables.
Results:
Lesion size, stroke type, age at stroke, and socioeconomic status were identified as predictors of neurocognitive outcome in our sample. Large lesions were associated with worse neurocognitive outcomes compared to small to medium lesions across neurocognitive domains. Exploratory spline regressions suggested that ischemic stroke was associated with worse neurocognitive outcomes than hemorrhagic stroke. Based on patterns shown in graphs, age at stroke appeared to have an impact on outcome depending on the neurocognitive domain and stroke type, with U-shaped trends suggesting worse outcome across most domains when stroke occurred at approximately 5 to 10 years of age. Socioeconomic status positively predicted outcomes across most neurocognitive domains. Participants with seizures had more severe executive functioning impairments than youth without seizures. Youth with combined cortical-subcortical lesions scored lower on abstract reasoning than youth with cortical and youth with subcortical lesions, and lower on attention than youth with cortical lesions. Neurologic severity predicted scores on abstract reasoning, attention, processing speed, and visuomotor integration, depending on stroke type. There was no evidence of differences on outcome measures based on time since stroke, lesion laterality, or lesion region defined as supra-versus infratentorial.
Conclusions:
The current study contributed to the scientific literature by identifying lesion size, stroke type, age at stroke, and socioeconomic status as predictors of neurocognitive outcome following pediatric stroke. Future research should examine other possible predictors of neurocognitive outcome that remain unexplored. Multisite collaborations would provide larger sample sizes and allow teams to build models with better statistical power and more predictors. Enhancing understanding of neurocognitive outcomes following pediatric stroke is a first step towards improving appraisals of prognosis.
Findings are clinically applicable as they provide professionals with information that can help assess individual expected patterns of recovery and thus refer patients to appropriate support services.
Many individuals with COVID-19 develop mild to moderate physical symptoms that can last days to months. In addition to physical symptoms, individuals with COVID-19 have reported depressive symptoms and cognitive decline, posing a long-term threat to mental health and functional outcomes. Few studies have examined the presence of co-occurring depression and subjective cognitive decline in individuals who tested positive for COVID-19. The current study examined whether having COVID-19 is subsequently associated with greater depressive symptoms and subjective cognitive decline when compared to healthy individuals. Our study also examined differential associations between symptoms of depression and subjective cognitive decline between individuals who have and have never had COVID-19.
Participants and Methods:
Adults (N = 104; mean age = 37 years, 69% female) were recruited online from Ontario and British Columbia, Canada. Participants were categorized into two groups: (1) persons who tested positive for COVID-19 at least three months prior, had been symptomatic, and had not been ventilated (N = 50); and (2) persons who have never been suspected of having COVID-19 (N = 54). The Center for Epidemiological Studies Depression Scale (CES-D) and the Subjective Cognitive Decline Questionnaire (SCD-Q) were administered to both groups as part of a larger clinical neuropsychological evaluation. Two separate linear regression analyses were conducted to examine the association of COVID-19 with depressive symptoms and subjective cognitive decline. A moderation analysis was performed to examine whether depressive symptoms were associated with subjective cognitive decline and the extent to which this differed by group (COVID-19 and controls). Participants’ age, self-reported sex, and history of depression were included as covariates.
Results:
The first regression model explained 17.2% of the variance in CES-D scores. It was found that the COVID-19 group had significantly higher CES-D scores (ß = .20, p = .03). The second regression model explained 35.9% of the variance in SCD-Q scores. Similar to the previous model, it was found that the COVID-19 group had significantly higher SCD-Q scores compared to healthy controls (ß = .22 p = .01). Lastly, the moderation model indicated that higher CES-D scores were associated with higher SCD-Q scores (ß = .43, p < .01), but there was no statistically significant group X CES-D score interaction.
Conclusions:
These findings suggest that individuals who previously experienced a mild to moderate symptomatic COVID-19 infection report greater depressive symptom severity as well as greater subjective cognitive decline. Additionally, while more severe depressive symptoms predicted greater subjective cognitive decline in our sample, the magnitude of this association did not vary between those with and without a previous COVID-19 infection. While the underlying neurobiological and social mechanisms of cognitive difficulties and depressive symptoms in persons who have had COVID-19 have yet to be fully elucidated, our findings highlight treatment for depression and cognitive rehabilitation as potentially useful intervention targets for the post COVID-19 condition.
Longstanding evidence finds that healthy older adults tend to experience greater positivity, equanimity, and well-being in daily life. Prominent psychological theories of emotional aging tend to focus on cognitive pathways such as shifting motivations and accumulated cognitive resources (e.g., attentional control, expertise) to explain observed emotional aging effects. In this chapter, we introduce the physiological hypothesis of emotional aging (PHEA). At its core, the PHEA proposes that physiological aging contributes to emotional aging, wherein age-related changes to the peripheral body and how the brain represents and regulates the peripheral body (e.g., interoception) should result in age-related changes to emotional experience and associated socioemotional perceptions and behaviors, i.e., emotion communication. Importantly, the PHEA argues that the dynamics of physiological aging (e.g., increased dysfunction, greater afferent noise from the viscera and peripheral transmission pathways, reduced interoception) may in turn facilitate the increased importance of cognitive pathways in late life emotional outcomes and functions. As such, the PHEA provides an integrative neuroscience approach to emotional aging that highlights the importance of physiological health and aging across the body and brain while providing an interpretive framework that complements existing cognitive theories of late life emotion. This chapter introduces core arguments of the PHEA, unifies existing evidence on physiological, interoceptive, and related neural aging as relevant for emotional aging, and forecasts new directions and implications for late life socioemotional functioning and interpersonal behaviors.
Infants and children born with CHD are at significant risk for neurodevelopmental delays and abnormalities. Individualised developmental care is widely recognised as best practice to support early neurodevelopment for medically fragile infants born premature or requiring surgical intervention after birth. However, wide variability in clinical practice is consistently demonstrated in units caring for infants with CHD. The Cardiac Newborn Neuroprotective Network, a Special Interest Group of the Cardiac Neurodevelopmental Outcome Collaborative, formed a working group of experts to create an evidence-based developmental care pathway to guide clinical practice in hospital settings caring for infants with CHD. The clinical pathway, “Developmental Care Pathway for Hospitalized Infants with Congenital Heart Disease,” includes recommendations for standardised developmental assessment, parent mental health screening, and the implementation of a daily developmental care bundle, which incorporates individualised assessments and interventions tailored to meet the needs of this unique infant population and their families. Hospitals caring for infants with CHD are encouraged to adopt this developmental care pathway and track metrics and outcomes using a quality improvement framework.
Patients with single-ventricle CHD undergo a series of palliative surgeries that culminate in the Fontan procedure. While the Fontan procedure allows most patients to survive to adulthood, the Fontan circulation can eventually lead to multiple cardiac complications and multi-organ dysfunction. Care for adolescents and adults with a Fontan circulation has begun to transition from a primarily cardiac-focused model to care models, which are designed to monitor multiple organ systems, and using clues from this screening, identify patients who are at risk for adverse outcomes. The complexity of care required for these patients led our centre to develop a multidisciplinary Fontan Management Programme with the primary goals of earlier detection and treatment of complications through the development of a cohesive network of diverse medical subspecialists with Fontan expertise.
Jaundice sometimes appears at birth, indicated by the dark yellow color of the countenance and arising from obstructions of the liver. Cases are generally incurable.
Gastrointestinal (GI) symptoms such as pain, heartburn, abdominal bloating, diarrhea, and constipation occur in most individuals at some time or another. Numerous diagnostic studies and medical interventions are available, but often the problems continue. Eager for relief, nearly half of all patients with chronic GI symptoms turn to the many “complementary” or “alternative” approaches available to the public [1]. This chapter reviews the options that have undergone testing, and summarizes those that are most likely to be of clinical benefit based on the quality of the studies. Many of the alternative approaches have undergone one form or another of clinical trial, but most often the data was either of poor quality or the studies were poorly controlled. Table 9.1 lists those approaches that are low risk and may be beneficial or have some supportive evidence. Table 9.2 lists those approaches that are clinically interesting but have insufficient supportive data to make a recommendation.
Lack of validated measures creates obstacles for psychology research progress. The validation of widely used instruments can facilitate research and clinical work.
Primary Care Evaluation of Mental Disorders (PRIME-MD) Patient Health Questionnaire (PHQ) is a cost-effective and psychometrically sound (Spitzer et al., 1999) instrument which is used for the diagnosis of specific psychiatric disorders according to the established diagnostic criteria. Unfortunately, despite its potential utility, PHQ has not been validated or used with Greek language populations.
The aim of this study is to conduct a PHQ validation in 520 Greek native-language participants in Cyprus. Appropriate self-report Greek-language measures were identified based on the convergence between the diagnostic specifications of these measures and PHQ diagnoses. The identified measures and the translated PHQ were used for data collection. Participants’ demographic and health information was also gathered.
Currently, the project is in its final stages of data collection, and will be completed by December, 2010. Preliminary results, suggest that a number of PHQ subscales have high internal consistency (e.g. Cronbach's alpha coefficient of .81 on Somatization, .83 on Depression) and correlate moderately with other diagnostic measures used (e.g. depression scale r = .43, p < .001 with BDI-II; panic scale r = .5, p < .001 with PDSQ panic scale).
Upon completion of data collection, PHQ factor structure, reliability, validity, sensitivity, and specificity will be further investigated. Item and correlation analysis will be confirmed.
Strength and weaknesses of PHQ subscales and the employed validation method will also be discussed.
Lieder and Griffiths rightly urge that computational cognitive models be constrained by resource usage, but they should go further. The brain's primary function is to regulate resource usage. As a consequence, resource usage should not simply select among algorithmic models of “aspects of cognition.” Rather, “aspects of cognition” should be understood as existing in the service of resource management.
For about a century there has been a modest research effort to explain the nature of prodigies and savants. Savant research emerged out of the medical field and centered on deficit/remediation. Research with prodigies generally consists of case studies by psychologists with an interest in the manifestation and development of extreme talent, sometimes as part of the “gifted child” movement in the United States, more recently as anomalies in developmental psychology.
Research into both phenomena evolved to incorporate new questions, including debates over the role of general versus specific intellectual abilities in talent development. This chapter summarizes and reviews research on prodigies and savants. It also reviews what, to date, has been found about the nature and interplay of general and specific intellectual strengths and weaknesses more generally, offering a possible role for both specific talent and general ability.
Two and a half decades ago, the discovery of Mercury’s polar deposits from Earth-based radar observations provided the first tantalizing, but limited, evidence for the possibility of water ice on the solar system’s innermost planet. Identifying the materials in Mercury’s polar deposits was one of the six major science questions that originally motivated the MESSENGER mission. In the course of the mission’s more than four Earth years of operations in orbit about Mercury, MESSENGER produced multiple datasets to investigate Mercury’s polar deposits: determinations of regions of permanent shadow, neutron spectrometer observations, laser altimeter reflectance measurements, thermal model results, and direct images of the deposits. These datasets provided compelling evidence that in addition to substantial amounts of water ice stored in Mercury’s polar deposits, there are also other volatile materials, postulated to be dark, organic-rich compounds that bury the water ice deposits. This chapter reviews MESSENGER’s investigations of Mercury’s polar deposits and discusses the resulting implications for the origin and evolution of Mercury’s polar water ice.
Our recent discovery of hazardous concentrations of arsenic in shallow sedimentary aquifers in Cambodia raises the spectre of future deleterious health impacts on a population that, particularly in non-urban areas, extensively use untreated groundwater as a source of drinking water and, in some instances, as irrigation water. We present here small-scale hazard maps for arsenic in shallow Cambodian groundwaters based on >1000 groundwater samples analysed in the Manchester Analytical Geochemistry Unit and elsewhere. Key indicators for hazardous concentrations of arsenic in Cambodian groundwaters include: (1) well depths greater than 16 m; (2) Holocene host sediments; and (3) proximity to major modern channels of the Mekong (and its distributary the Bassac). However, high-arsenic well waters are also commonly found in wells not exhibiting these key characteristics, notably in some shallower Holocene wells, and in wells drilled into older Quaternary and Neogene sediments.
It is emphasized that the maps and tables presented are most useful for identifying current regional trends in groundwater arsenic hazard and that their use for predicting arsenic concentrations in individual wells, for example for the purposes of well switching, is not recommended, particularly because of the lack of sufficient data (especially at depths >80 m) and because, as in Bangladesh and West Bengal, there is considerable heterogeneity of groundwater arsenic concentrations on a scale of metres to hundreds of metres. We have insufficient data at this time to determine unequivocally whether or not arsenic concentrations are increasing in shallow Cambodian groundwaters as a result of groundwater-abstraction activities.
Herbicides applied April 30, May 10, or October 14 gave best control of musk thistle (Carduus nutans L.). The most effective herbicide at all dates and rates was 4-amino-3,5,6-trichloropicolinic acid (picloram). Two lb/A of 2-methoxy-3,6-dichlorobenzoic acid (dicamba) also was effective at all spring dates. Two lb/A of 2,4-dichlorophenoxyacetic acid (2,4-D) resulted in excellent control of musk thistle when applied May 10 or October 14.
More musk thistle seedlings became established in nongrazed, cool season grass pastures than in nongrazed, mixed warm season grass pastures. Greater germination was attributed to the reserve moisture and accumulation of litter which served as an excellent germination medium. However, only one musk thistle plant remained in the nongrazed pastures 1 year after seeding. The remainder of the seedlings and young rosettes found in the protected areas in 1965 had succumbed to the heavy competition by 1966.