Differences In Temperament Research Articles

Adaptation of the Keirsey Temperament Sorter II (KTS-II) for the Chinese vocational university students majoring in preschool education

ABSTRACT The preschool education major in vocational universities serves as the core platform for cultivating students who are preparing to become applied early childhood teachers in China, but currently its education is too unified and ignores the differences among students. In addition, there is a lack of a measurement instrument to understand student differences. The purpose of this study is to adapt the English version of the Keirsey Temperament Sorter II (KTS-II) into the Chinese version in order to measure and understand the temperament types of Chinese vocational university students majoring in preschool education, so as to make it possible to conduct differentiated education based on student temperament differences. The adaptation procedure consists of three phases: (1) the scale translation phase; (2) the scale evaluation phase, including expert evaluation and target population pretesting; and (3) the scale testing phase, including initial testing and retesting. The results show that by removing six items from the original English version of the KTS-II, 64 items in the Chinese version of the KTS-II have been proven to have acceptable validity and reliability. The conclusions suggest that the Chinese version of the KTS-II can be used by relevant stakeholders in the preschool education major of Chinese vocational universities to distinguish student differences, and the scale adaptation procedure and methods in this study can serve as a theoretical reference for scale adaptors.

Behavioural repeatability in dung beetles is not limited to subsocial and sexual horn dimorphic species: the case of Geotrupes mutator (Coleoptera, Geotrupidae)

Abstract The study of temperament and behavioural syndromes in insects is still in its early stage, and research conducted to date has mainly focused on locomotor activity and thanatosis. Dung beetles have been the subject of extensive behavioural studies; however, very few studies have addressed the expression of temperament. Those doing so only looked at subsocial and sexual horn dimorphic species, suggesting subsociality and/or sexual horn-dimorphism as possible facilitators of temperament expression. To test this assumption, we conducted a temperament study in a hornless, non-subsocial species, namely Geotrupes mutator (Marsham, 1802). We set up laboratory tests to evaluate three behaviours (activity, thanatosis, and distress calls) through the measurement of seven distinct behavioural traits (three activity-, one thanatosis- and three call-related traits). We found high levels of individual repeatability in all activity- and thanatosis-related traits. We also identified behavioural differences between individuals, which may reflect differences in temperament. Statistical analyses revealed a negative correlation between activity and thanatosis. These results show that the temperament and behavioural syndromes related to activity and thanatosis may also be expressed in dung beetle species that are neither subsocial nor sexual horn dimorphic. By contrast, we only found one of three sound-related traits tested (frequency) to be clearly repeatable. Males and females presented a different structure of the stridulatory apparatus, suggesting that morphology may affect the frequency of sounds emitted. These results indicate that certain sound traits might not be good descriptors of individual temperament revealing the need for future research addressing the role of bioacoustics.

Mood temperaments in adult patients with attention-deficit/hyperactivity disorder

BackgroundThe incidence of various mood disorders and temperaments in ADHD patients is well-documented, irrespective of age. These temperamental differences cause emotional and behavioral instability, impacting individual and social functioning, and overall quality of life. This study evaluates different temperaments in adults with ADHD compared to those without ADHD.MethodsThis case–control study was performed on 75 adult ADHD patients as the case group and 75 adults without ADHD as the control group. A demographic questionnaire and a shortened Persian version of the TEMPS-A questionnaire were given and completed to the people included in the study to assess different mood temperaments.ResultsComparing different components of mood temperaments between the patients with and without ADHD showed significantly higher mean scores for irritable, anxious, depressed, and cyclothymic temperaments in those with ADHD as compared to a control group. In the group suffering from ADHD, women had significantly higher mean scores for dysthymic and anxious temperaments as compared to men, while the mean score for cyclothymic temperaments was significantly higher in men than in women. A high academic degree was associated with lower scores for mood temperaments, while mood temperaments were independent of patients’ age.ConclusionsThe higher score of various mood temperaments in patients with ADHD compared to people without this disorder is completely predictable, and this score can potentially affect the gender of the patients as well as their education level. Given the higher scores of temperamental traits in patients with adult ADHD, implementing screening programs aimed at identifying temperamental disorders in these patients is highly emphasized.

Temperament and Voice Quality in Patients With Vocal Fold Nodules

BackgroundVocal fold nodules are most common in women and patients with vocal fold nodules represent the largest group in voice clinics. The prevalence of vocal fold nodules is particularly high in professions where the voice is used on a regular basis. The quality of the voice is influenced by a number of factors, including temperament, stress, and emotional state. These factors can influence the physiological conditions of phonation.The objective of this study was to assess the acoustic parameters of voice in patients with vocal nodules in comparison to healthy controls, and to determine whether voice quality is influenced by emotional state and coping with stress. MethodsA total of 32 patients admitted to the ENT Department of the University Medical School with voice disorders between March and June 2007 constituted the study group. All patients were found to have a vocal nodules on physical and stroboscopic examination. The control group consisted of 30 healthy individuals who did not report any voice disorders. All subjects underwent voice recordings in the voice laboratory. Following the completion of the voice evaluation form, anaerodynamic assessment (a, s, s/z-time), an index of vocal impairment, the Rosenbaum Schedule of Learned Resourcefulness (RLRS) and the Temperament and Characteristics Inventory (TEMPS-A), all subjects underwent further assessment. Acoustic analysis was conducted using the CSL program in MDVP and the Vocal Assessment component of Dr. Speech. ResultsThe decrease in MPT in the study group was statistically significant. There were statistically significant differences in the parameters MFo, Jitt, RAP, PPQ, SHdB, Shim, APQ, NHR, SPI from the MDVP, Jitter, Shim% from the voice assessment, and the perceptual rating (H, R, B) from Dr. Speech’s voice assessment analysis. The differences in the dimensions of anxious temperament and the examination of stress problem-solving strategies were significant between the study group and the control subjects. Differences in aerodynamic and acoustic parameters were found between disordered and healthy groups, as well as between individuals with different personalities. Overall, those with nodules were less likely to manage stress well than those without nodules. ConclusionThe study group and the control subjects showed significant differences in anxious temperament dimensions and stress problem-solving strategies. There were also differences in aerodynamic and acoustic parameters between the disordered and healthy groups, as well as between the groups with and without personality temperament differences. Overall, those with nodules were less likely to manage stress well than those without nodules. This finding indicates that stress management options are not effectively utilized in patients with vocal fold nodules. So, it might be a good idea to look into some kind of therapeutic approach and patient education for stress management.

Human animal relationships in Bos indicus cattle breeds addressed from a Five Domains welfare framework.

The present review has two objectives, the first is to investigate the differences in temperament between Bos indicus and Bos taurus breeds and determining the effects on production due to positive treatment and to compare this with negative HAR, by using the Five Domain Model as framework. The second objective is to discuss potential strategies to achieve better HAR when working with Bos indicus cattle. Bos indicus are more reactive and temperamental than Bos taurus cattle. When human animal relationships (HAR) are evaluated, Bos indicus cattle may react with greater intensity. They may be more likely to develop a negative emotional state, especially in extensively raised Bos indicus cattle that are handled only a few times each year. Bos indicus cattle can have positive emotional states when they have frequent positive interactions with people. Interactions with people, both positive and negative, would be in the fourth Domain of the Five Domains model. Cattle that are more reactive during handling may also have lower weight gain, even when they have abundant feed. This would be in the first Domain of Nutrition. When cattle are handled in races and corrals, injuries may be more likely to occur. Injuries and bruises would be in the third Domain of Health. Injuries could be caused by either poor handling practices by people or poor handling facilities. Yelling or electric prod use would be examples of poor HAR. Second Environmental Domain issues may be broken facilities or slick, slippery floors that are associated with falls.

Exploring the relationship between child temperament, maternal psychiatric symptoms, family environment and infant feeding.

Infant temperament is assumed to be primarily innate. However, newer research suggests that maternal affection impacts ratings of temperament and environmental factors, including feeding method, can also influence infant temperament. This study investigates child temperament and its relationships with maternal psychiatric symptoms, environmental variables and feeding method longitudinally in a cohort of children followed from 6 to 72 months. Differences in temperament by feeding group are also investigated. We hypothesized that maternal psychiatric symptoms, environmental stressors, and impaired family dynamics would have negative impact on child temperament, whereas breastfeeding would have a positive impact on child temperament. Mothers' ratings of child's temperament, own psychiatric symptomatology, environmental stresses and family cohesion were obtained in 504 mother-infant dyads via rating scales completed by mothers. Infants were breastfeed (BF), fed soy-based infant formula (SF) or dairy-based infant formula (MF). Linear mixed effect models investigated the relationship of variables on child's temperament while controlling for significant covariates and repeated measurements. Mothers in this study did not endorse clinical-level psychiatric symptomatology; however, when adjusted for significant covariates, higher psychiatric symptomatology significantly correlated with environmental stressors, impaired family dynamics and elevations in temperament ratings of infants' adaptability and mood. There were no lasting differences for temperament between feeding groups. However, some significant transient increases in rhythmicity and adaptability were found between SF and BF children. Positive relationships between family environment stressors and maternal psychiatric ratings were found. Transient differences were found in child temperament based upon feeding method.

Scaling a common assessment of associative ability: Development and validation of a multiple-choice compound remote associates task.

The assessment of creativity as an individual difference has historically focused on divergent thinking, which is increasingly viewed as involving the associative processes that are also understood to be a key component of creative potential. Research on associative processes has proliferated in many sub-fields, often using Compound Remote Associates (CRA) tasks with an open response format and relatively small participant samples. In the present work, we introduce a new format that is more amenable to large-scale data collection in survey designs, and present evidence for the reliability and validity of CRA measures in general using multiple large samples. Study 1 uses a large, representative dataset (N = 1,323,480) to demonstrate strong unidimensionality and internal consistency (α = .97; ωt = .87), as well as links to individual differences in temperament, cognitive ability, occupation, and job characteristics. Study 2 uses an undergraduate sample (N = 685) to validate the use of a multiple-choice format relative to the traditional approach. Study 3 uses a crowdsourced sample (N = 357) to demonstrate high test-retest reliability of the items (r =.74). Finally, Study 4 uses a sample that overlaps with Study 1 (N = 1,502,922) to provide item response theory (IRT) parameters for a large set of high-quality CRA items that use a multiple-choice response mode, thus facilitating their use in future research on creativity, insight, and related topics.

Changes in temperament, character and intensity of empathy in adolescents treated in a day care unit - pilot study.

The aim of this pilot study was to compare the level of empathy, temperament and character traits before and after 6 months of treatment in a group of patients staying in a psychiatric day care unit in groups with different (internalising vs. externalising) disorder types. The study was conducted in a group of 44 patients (33 girls and 11 boys), aged 15-20, treated between 2016 and 2021 in the Clinical Day Care Unit of the Department of Adult, Child and Adolescent Psychiatry of the University Hospital in Krakow. 40% of the adolescents had externalising disorders and 60% had internalising disorders. The Davis Empathy Scale and the Cohen Empathy Scale were used in the study, as well as the Cloninger' Temperament and Character Inventory (TCI). Six months of treatment in a day care unit resulted in statistically significant changes in the "Fantasy" scale from the Davis Empathy Scale, in the "Reward dependence", "Self-directedness" and "Self-transcendence" subscales on the Temperament and Character Inventory in the group of adolescents with internalising disorders. In the group of adolescents with externalising disorders, there were changes at the level of statistical trend in the values of the "Fantasy" scale and the "Harm Avoidance" scale of the Temperament and Character Inventory. The obtained results are in line with the available data in terms of differences in temperament and character profiles between types of mental disorders and constellations of traits that are unfavourable for mental health, such as low self-directedness, harm avoidance and reward dependence.

Validation of the Approach-Avoidance Temperament Questionnaire in Individuals with Anxiety and Depression

The Approach-Avoidance Temperament Questionnaire (ATQ) is a well-established measure assessing heightened sensitivity and reactivity to reward/positive stimuli (approach temperament) and to punishment/negative stimuli (avoidance temperament). These basic dimensions of personality are believed to be important for understanding the etiology and maintenance of anxiety and depressive disorders. Despite the ATQ’s potential utility in clinical psychology research, its psychometric properties and factor structure have yet to be examined in a psychiatric sample. The aims of the present study were to 1) conduct confirmatory factor analysis to replicate the ATQ’s factor structure in individuals diagnosed with an anxiety or depressive disorder (N = 244), 2) assess internal consistency and convergent and divergent validity, and 3) explore differences in approach and avoidance temperaments in individuals with versus without a diagnosis of anxiety or depression. Results confirmed the original two-factor structure of the ATQ in a clinical sample, with approach and avoidance temperaments representing orthogonal dimensions. The measure demonstrated strong internal consistency, convergent and divergent validity, and predictive validity. Individuals with anxiety and depression scored higher on avoidance items and lower on approach items compared to those without clinical diagnoses. This study supports the use of the ATQ in clinical populations.

The Global Temperament Project: Parent-reported temperament in infants, toddlers, and children from 59 nations.

Data from 83,423 parent reports of temperament (surgency, negative affectivity, and regulatory capacity) in infants, toddlers, and children from 341 samples gathered in 59 countries were used to investigate the relations among culture, gender, and temperament. Between-nation differences in temperament were larger than those obtained in similar studies of adult personality, and most pronounced for negative affectivity. Nation-level patterns of negative affectivity were consistent across infancy, toddlerhood, and childhood, and patterns of regulatory capacity were consistent between infancy and toddlerhood. Nations that previously reported high extraversion, high conscientiousness, and low neuroticism in adults were found to demonstrate high surgency in infants and children, and countries reporting low adult openness and high adult neuroticism reported high temperamental negative affectivity. Negative affectivity was high in Southern Asia, Western Asia, and South America and low in Northern and Western Europe. Countries in which children were rated as high in negative affectivity had cultural orientations reflecting collectivism, high power distance, and short-term orientation. Surgency was high in Southeastern and Southern Asia and Southern Europe and low in Eastern Asian countries characterized by philosophies of long-term orientation. Low personal income was associated with high negative affectivity. Gender differences in temperament were largely consistent in direction with prior studies, revealing higher regulatory capacity in females than males and higher surgency in males than females, with these differences becoming more pronounced at later ages. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Temperamental differences in the Subtypes of Attention Deficit Hyperactivity Disorder

IntroductionAttention-Deficit/Hyperactivity Disorder (ADHD) is a neurodevelopmental condition marked by difficulties in attention, hyperactivity, and impulsivity. Its subtypes—predominantly inattentive, predominantly hyperactive-impulsive, and combined—vary in symptom presentation and impact on daily functioning. Understanding these subtypes is crucial for tailored interventions and support.ObjectivesOur aim is to clinically characterize the psychopathological aspects of the subtypes of ADHD.MethodsOur study is conducted on patients (>18 years) referred to the adult ADHD outpatient service of the Psychiatric Clinic of Ancona (Università Politecnica delle Marche, Italy). The Diagnostic Interview for ADHD in adults (DIVA 5.0) was used for diagnosing ADHD. The following rating scale were administered: Temperament Evaluation in Memphis, Pisa and San Diego (TEMPS-M), and Temperament and Character Inventory-Revised (TCI-R).Results76% (n=170) of all screened patients were diagnosed with ADHD in adulthood. 57.6% (n=98) were diagnosed with ADHD combined subtype, 35.3% (n=60) with ADHD inattentive subtype, and 7.1% (n=12) with ADHD hyperactive subtype. Only 12.9% (n=22) were diagnosed with ADHD in childhood. Based on the results obtained at TEMPS-M, 43.8% (n=32) of patients were found to have cyclothymic temperament. Subjects with ADHD combined subtype scored significantly higher mean on the irritable temperament subscale of the TEMPS-M than those with ADHD inattentive subtype (p=0.016), while patients with ADHD inattentive subtype had a significantly higher mean score on the disorderliness subscale of the TCI-R than those with ADHD hyperactive and combined subtype (p=0.010). Given the logistic regression analyses using the TCI-R, developing an inattentive type of ADHD is negatively predicted by the disorderliness subscale of the TCI-R (exp(B)=0.788, IC95%=0.669-0.929, p=0.005) and positively predicted by the extravagance subscale of the TCI-R (exp(B)=1.104, IC95%=1.009-1.208, p=0.031), the hyperactive subtype of ADHD is negatively predicted by the fatigability subscale of the TCI-R (exp(B)=0.775, IC95%=0.597-1.005, p=0.055) and the combined subtype that is positively predicted by the disorderliness subscale of the TCI-R (exp(B)=1.140, IC95%=1.011-1.287, p=0.033). Regarding temperament, through a logistic regression analysis, the inattentive subtype of ADHD is negatively predicted by the irritable temperament subscale of the TEMPS-M (exp(B)=0.904, IC95%=8.39-0.974, p=0.008), while for the combined subtype of ADHD it is positively predicted by the irritable temperament subscale of the TEMPS-M (exp(B)=1.088, IC95%=1.014-1.167, p=0.019).ConclusionsThe results show that irritable temperament is a predictor for the inattentive and combined subtype, but with different polarities. In addition, how different patterns of personality are specific to the various subtypes of ADHD are highlighted.Disclosure of InterestNone Declared

A preliminary analysis of the effect of individual differences on cognitive performance in young companion dogs

Many factors influence cognitive performance in dogs, including breed, temperament, rearing history, and training. Studies in working dog populations have demonstrated age-related improvements in cognitive task performance across the first years of development. However, the effect of certain factors, such as age, sex, and temperament, on cognitive performance in puppies has yet to be evaluated in a more diverse population of companion dogs. In this study, companion dogs under 12 months of age were tested once on two tasks purported to measure aspects of executive function: the delayed-search task (DST) and the detour reversal task (DRT). Owners also filled out the Canine Behavioral Assessment and Research Questionnaire (C-BARQ) to evaluate how temperament influenced task performance. Contrary to prior research, performance did not improve with age on either task. However, the lack of age effects was likely the result of small sample sizes and individual differences across other factors influencing performance. Specifically, temperament differences as measured by the C-BARQ subscales for nonsocial fear and excitability predicted task performance on the DST, but the effect of temperament on task performance differed between males and females. Excitability also predicted performance on the DRT, but the effect depended on the age of the dog. In addition, no correlations were observed between task measures, indicating a lack of construct validity. Overall, these findings provide a preliminary analysis of factors that appear to influence cognitive task performance in young companion dogs and highlight suggestions for future research evaluating the impact of individual differences on cognitive performance.

Prenatal maternal immune activation predicts observed fearfulness in infancy.

Fear reactivity is an early emerging temperament trait that predicts longer term behavioral and health outcomes. The current analysis tests the hypothesis, an extension of prior research on maternal immune activation (MIA), that the prenatal maternal immune system is a reliable predictor of observed fear reactivity in infancy. The analysis is based on a prospective longitudinal cohort study that collected data from the first trimester and conducted observational assessments of temperament at approximately 12 months of age (n = 281 infants). MIA was assessed from immune biomarkers measured in maternal blood at each trimester; infant temperament was assessed using the Laboratory Temperament Assessment Battery assessment at 12 months; covariates included family and sociodemographic factors. Patterns of inflammatory markers across gestation reliably predicted observed temperament: elevated prenatal MIA was associated with high fear reactivity to novel stimuli. The findings provide novel evidence of prenatal origins of fear reactivity and suggest developmental mechanisms that may underlie early emerging individual differences in child temperament. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

A preliminary investigation of epigenome-wide DNA methylation and temperament during infancy.

This study provides preliminary evidence for an epigenetic architecture of infant temperament. At 12 months of age, blood was collected and assayed for DNA methylation and maternally reported infant temperament was assessed using the Infant Behavior Questionnaire in 67 mother-infant dyads. Epigenome-wide analyses showed that the higher order temperament dimensions Surgency and Negative Affect were associated with DNA methylation. The epigenetic signatures of Surgency and Negative Affect were situated at genes involved in synaptic signaling and plasticity. Although replication is required, these results are consistent with a biologically based model of temperament, create new avenues for hypothesis-driven research into epigenetic pathways that underlie individual differences in temperament, and demonstrate that infant temperament has a widespread epigenetic signature in the methylome.

Children’s shyness and early stages of emotional face processing

The ability to detect and recognize facial emotions emerges in childhood and is important for understanding social cues, but we know relatively little about how individual differences in temperament may influence early emotional face processing. We used a sample of 419 children (Mage = 10.57 years, SD = 1.75; 48% female; 77% White) to examine the relation between temperamental shyness and early stages of emotional face processing (assessed using the P100 and N170 event-related potentials) during different facial expressions (neutral, anger, fear, and happy). We found that higher temperamental shyness was related to greater P100 activation to faces expressing anger and fear relative to neutral faces. Further, lower temperamental shyness was related to greater N170 activation to faces expressing anger and fear relative to neutral faces. There were no relations between temperamental shyness and neural activation to happy faces relative to neutral faces for P100 or N170, suggesting specificity to faces signaling threat. We discuss findings in the context of understanding the early processing of facial emotional display of threat among shy children.

Gender differences in borderline personality disorder: a narrative review.

Borderline personality disorder (BPD) is a severe and complex mental disorder that traditionally has been found to be more frequent in the female gender in clinical samples. More recently, epidemiological studies have provided conflicting data about the prevalence of borderline disorder in the two genders in community samples. In order to explain this heterogeneity, some authors hypothesized the presence of a bias in the diagnostic criteria thresholds (more prevalent in one gender than another), in the population sampling (community versus clinical), in the instruments of evaluation (clinician versus self-report measures), and in the diagnostic construct of BPD. Beyond the question of the different prevalence of the disorder between genders, the debate remains open as to how personality and clinical characteristics, and attitude toward treatments express themselves in the two genders. This narrative review is aimed to provide an updated overview of the differences among genders in BPD in terms of diagnosis, temperamental and clinical characteristics, comorbidities, findings of neuroimaging, and treatment attitudes. Studies that specifically investigated the gender differences in BPD patients are rather limited. Most of the investigations did not consider gender as a variable or were characterized by a significant imbalance between the two genders (more commonly in favor the female gender). The main results indicated that men were more likely to endorse the criteria "intense and inappropriate anger" and "impulsivity," whereas women endorsed the criteria "chronic feelings of emptiness," "affective instability," and "suicidality/self-harm behaviors." These findings reflect differences in temperament and symptoms of the two genders. Other relevant differences concern pattern of comorbidity, specific neurobiological mechanisms and attitude to treatments. Main limitations were that only one database was searched, time of publications was limited, non-English manuscripts were excluded, and the quality of each paper was not commented.

Repeatability of measures of behavioral organization over two years in captive infant rhesus macaques, Macaca mulatta.

Individual differences of infant temperament have been associated with future health outcomes that provide explanatory power beyond adult personality. Despite the importance of such a metric, our developmental understanding of personality-like traits is poor. Therefore, we examined whether young primates show consistency in personality traits throughout development. We replicated a Biobehavioral Assessment (BBA) at three time periods: 3-4 months, 1 year, and 2 years of age in 47 rhesus macaque (Macaca mulatta) subjects from large mixed-sex outdoor social housing units at the California National Primate Research Center. We report results for tests focused on responses and adaptation to the temporary separation and relocation, responses to a threatening stimulus, and ratings of overall temperament. We found consistently repeatable associations in measures of Emotionality; these associations were stronger in males, but also present in females, and broadly consistent between Years 1 and 2. We also explored whether behavioral responses to this experimental relocation might be influenced by their experience being relocated for other reasons (i.e., hospitalizations) as individuals' responses might be influenced by similar experiences to the BBA procedure. Only locomotion, during one of the assessments, was associated with past hospitalization events. Overall, repeatability in Emotionality-associated behaviors was evident across the 2 years, in both sexes. We did, however, find evidence of the emergence of sex differences via differentiated expression of behavioral responses during the BBA. We emphasize that there is likely contextual nuance in the use of these BBA factor-associated behaviors. Further research is required to determine whether and how shifts occur in underlying factor structure and the expression of associated behaviors.

Association between Temperament and Stress-related Gene Expression in Day-old Chickens.

Stress in day-old chickens from commercial hatcheries is associated with problematic behavior in adult animals. Recently, we developed a new behavioral handling test for day-old chickens and demonstrated that it assessed temperament differences between seven breeds of native Japanese and Western chickens. In this study, we used 2-day-old male chicks from five of the above breeds to investigate the relationship between temperament and mRNA levels of three stress-related genes (nuclear receptor subfamily 3 group C member 1 (NR3C1), cytochrome P450 family 11 subfamily A member 1, and hydroxy-delta-5-steroid dehydrogenase, 3 beta- and steroid delta-isomerase 1) involved in the hypothalamic-pituitary-adrenal axis. Principal component analysis of 10 behavioral traits for the handling test revealed that the Fayoumi breed and Hiroshima line of the Chabo breed, both of which exhibited boisterous temperament, clustered separately from the other breeds. Only NR3C1 expression showed a significant positive correlation with two behavioral traits (general vocalization and approaching the wall), and a negative correlation with movement. These results suggest that the complex temperament of day-old chickens is regulated, in part, by stress-related genes along the hypothalamic-pituitary-adrenal axis.

Resting EEG correlates of neurodevelopment in a socioeconomically and linguistically diverse sample of toddlers: Wave 1 of the Kia Tīmata Pai best start New Zealand study

Development of communication and self-regulation skills is fundamental to psychosocial maturation in childhood. The Kia Tīmata Pai Best Start (KTP) longitudinal study aims to promote these skills through interventions delivered at early childcare centers across New Zealand. In addition to evaluating effects of the interventions on behavioral and cognitive outcomes, the study utilizes electroencephalography (EEG) to characterize cortical development in a subsample of participating children. Here, we present results of the baseline resting EEG assessment with 193 children aged 15 to 33 months. We identified EEG correlates of individual differences in demographics, communication abilities, and temperament. We obtained communication and behavior ratings from multiple informants, and we applied contemporary analytic methods to the EEG data. Periodic spectral power adjusted for aperiodic activity was most closely associated with demographic, language, and behavioral measures. As in previous studies, gamma power was positively associated with verbal language. Alpha power was positively associated with effortful control. Nonverbal and verbal language measures showed distinct associations with EEG indices, as did the three temperament domains. Our results identified a number of candidate EEG measurements for use as longitudinal markers of optimal cortical development and response to interventions in the KTP cohort.

Temperament in Toddlers With and Without Prelingual Hearing Loss.

The purpose of this study is to examine parent-reported ratings of temperament in toddlers with and without prelingual hearing loss. The parent-completed Early Childhood Behavior Questionnaire (ECBQ) was used to assess temperament in toddlers aged 18-36 months. Three dimensions of temperament were examined: surgency, negative affectivity, and effortful control. Analyses were conducted to (a) examine differences in temperament across toddlers with and without prelingual hearing loss; (b) examine possible associations between temperament, demographic, and communication factors; and (c) determine if the ECBQ is sensitive to differences in hearing, communication, and listening skills among toddlers with prelingual hearing loss. The parent-completed ECBQ revealed that toddlers with prelingual hearing loss differed from their hearing peers on some but not all dimensions of temperament. Specifically, children with prelingual hearing loss were rated as displaying higher levels of surgency and lower levels of effortful control but comparable levels of negative affectivity when compared to their hearing peers. Regression analyses revealed that chronological age and communication strategy predicted scores of effortful control in toddlers with prelingual hearing loss, whereas chronological age alone predicted scores of effortful control in toddlers with hearing. Finally, the ECBQ appears to contain "listening" items that skew (lower) levels of effortful control in toddlers with prelingual hearing loss, such that only the group effect of higher levels of surgency remained after removing these "listening" items. Correlations between the original and our modified ECBQ (removing the "listening" items) revealed strong associations, reflective of high construct validity. This was the first study to measure temperament in toddlers with prelingual hearing loss using the ECBQ. Our results revealed differences between children with and without prelingual hearing loss centering on the dimension of surgency. Examining differences in temperament during the toddler period of development may be particularly important and useful for predicting functional outcomes following prelingual hearing loss.