Environmental sensitivity, defined as the capacity to perceive and process information from both supportive and adverse environmental experiences, plays an important role in socio-emotional and behavioral development. However, existing research has predominantly focused on childhood, leaving a gap in our understanding of environmental sensitivity during adolescence. To bridge this gap, we conducted three studies using self-report data from 2,375 Japanese adolescents aged 10–14 years and their mothers. First, we aimed to provide a comprehensive description of adolescent sensory processing sensitivity (referred to as trait sensitivity) by applying the 21-item Highly Sensitive Child scale to Japanese adolescents (Studies 1 and 2). Second, using three-wave longitudinal data, we examined how trait sensitivity interacts with various environmental contexts (i.e., negative/positive parenting and peer relationships) to predict adolescents’ socio-emotional and behavioral development (Study 3). Results showed that adolescent trait sensitivity was characterized by a general factor reflecting sensitivity to a broad range of negative and positive stimuli, as well as two specific domains: Ease of Excitation–Low Sensory Threshold and Aesthetic Sensitivity (i.e., bifactor model). Trait sensitivity was positively correlated with other temperament and personality traits, including negative emotionality, behavioral inhibition, neuroticism, and openness. Trait sensitivity and environmental factors independently predicted internalizing and externalizing problems, as well as prosocial behavior. Notably, trait sensitivity was a significant positive predictor of both internalizing problems and prosocial behavior. These findings suggest partial continuity in the structure and developmental functions of trait sensitivity from childhood to adolescence.

This study investigated the psychometric properties of the Highly Sensitive Child-Rating System (HSC-RS), the existence of sensitivity groups, and the characterization of sensitivity at behavioral, genetic, and physiological levels in 541 preschoolers (M(SD)age = 3.56(0.27); 45%male; 87%Caucasian). Temperament, genetic, cortisol, and electroencephalography asymmetry data were collected in subsamples (n = 94-476). Results showed a reliable observational measure of sensitivity. Confirmatory factor and latent class analysis supported a one-factor solution and three sensitivity groups, that are a low (23.3%), medium (54.2%), and a high (22.5%) sensitivity group. Hierarchical regression analyses showed moderate associations between HSC-RS and observed temperament traits (i.e., behavioral level). In addition, a small negative association between HSC-RS and a genome-wide association study polygenic risk score (GWAS PGS) for Attention Deficit Hyperactivity Disorder was found. No relations with candidate genes, other GWAS PGS phenotypes, and physiological measures were found. Implications of our findings and possible explanations for a lack of these associations are discussed.

Individuals differ in how they perceive and process social and sensory information in their environment, a personality trait known as Sensory Processing Sensitivity (SPS). Approximately 30% of the general population scores high on this trait making them more responsive to both negative and positive environmental influences than individuals lower in SPS. Overstimulation is one of the biggest challenges associated with SPS. Associations between SPS, triggers, and fluctuations of overstimulation in everyday life were examined using an experience sampling method study (during one week with 5 prompts a day) in 139 healthy adults. Results showed that overstimulation increased in the afternoon to early evening and in the presence of others. Furthermore, more sensitive individuals reported higher levels of overstimulation when auditory and visual stimuli were rated as unpleasant, when fatigued, or in a negative mood. Yet, more sensitive individuals reported lower levels of overstimulation with momentary pleasant auditory and visual stimuli, when not fatigued, and in a positive mood at the current moment. Everyone, but particularly individuals high in SPS, may benefit from interventions preventing fatigue, promoting positive mood and the pleasantness of sensory stimuli in their daily environments to reduce feelings of overstimulation.

Supportive parenting experiences link to secure attachment development, and secure attachment in turn links to children's emotional well-being. However, little is known whether child-factors, like their environmental sensitivity, moderate these associations for better or for worse. We used longitudinal data (three data waves spanning two years) from 614 children (Wave 1: Mage = 10.28; SDage = 0.58; 44% boys). At all waves, attachment was operationalized as children's knowledge of the Secure Base Script with a coded narrative task. Children filled out questionnaires on supportive parenting, their environmental sensitivity and their depressive symptoms. Parents filled out questionnaires on children's internalizing problems. Results: environmental sensitivity moderated the link between supportive parenting and attachment. More sensitive children that perceived their parents as less supportive less likely developed SBS knowledge. Further, environmental sensitivity moderated the link between SBS knowledge and the development of internalizing problems. More sensitive children with less SBS knowledge developed more internalizing problems. The findings support the importance of accounting for environmental sensitivity in attachment research.

Sensory processing sensitivity (SPS) pertains to individual differences in responsiveness to environmental stimuli. The Highly Sensitive Child Scale-21 item (HSC-21) is a reliable and validated self-report measure to assess sensory processing sensitivity for children and adolescents. This study aimed to evaluate the psychometric properties of the Chinese version of the HSC-21 in a mainland China. The sample comprised 1372 middle school students (48

Dit proefschrift biedt meer inzicht in de meting van individuele verschillen in omgevingssensitiviteit en in de karakterisering ervan over meerdere analyseniveaus, namelijk het fenotypische, fysiologische en genetische niveau. In het eerste deel evalueerden we de psychometrische eigenschappen van een zelfrapportagevragenlijst over leeftijd, geslacht, land en informanten en verbeterden we deze schaal (hsc-21). In het tweede deel karakteriseerden we individuele verschillen in omgevingssensitiviteit zoals gemeten met de hsc-21 schaal en een observatiemethode, op gedrags-, fysiologisch en genetisch niveau. Wij vonden zinvolle associaties met temperament, een genetische sensitiviteit en zelfgerapporteerde stress, maar niet met de biologische stressrespons. Abstract This doctoral thesis provides more insight into the measurement of individual differences in environmental sensitivity and its characterization across multiple levels of analysis, namely the phenotypic, physiological and genetic level. In the first part of the doctoral thesis, we evaluated and improved the psychometric properties of a self-report questionnaire measuring individual differences in environmental sensitivity across age, gender, country, and informants (HSC-21). In the second part, we characterized individual differences in environmental sensitivity as measured by the HSC-21 scale and an observational method, at the behavioral, physiological and genetic level. We found meaningful associations with temperament, a genetic sensitivity and self-reported stress, but not with the biological stress response.

The current study investigated whether variations at the level of the cortisol stress response moderate the association between parental support and attachment development. To test this hypothesis, we conducted a one-year longitudinal study with two waves in which 101 children (56% girls, M (age) = 11.15, SD (age) = 0.70) participated. Attachment anxiety and avoidance were measured at baseline (Wave 1) and one year later (Wave 2). Parental support and children's cortisol stress response during the Trier Social Stress Test were measured at Wave 2. Children's cortisol stress response was found to moderate the association between parental support and relative change in anxious attachment. A strong cortisol stress response weakened the associated between parental support and relative change in anxious attachment. No moderation effects were found for relative change in avoidant attachment.

BACKGROUND:Daily Hassles (DH) or daily stress - is a mild type of stressor with unique contributions to psychological distress. Yet, most prior studies that investigate the effects of stressful life experiences focus on childhood trauma or on early life stress and little is known about the effects of DH on epigenetic changes in stress system related genes and on the physiological response to social stressors.METHODS:In the present study, conducted among 101 early adolescents (mean age = 11.61; SD = 0.64), we investigated whether Autonomic Nervous System (ANS) (namely heart rate and heart rate variability) and Hypothalamic-Pituitary-Adrenal (HPA) axis functioning (measured as cortisol stress reactivity and recovery) are associated with DNA methylation (DNAm) in the glucocorticoid receptor gene (NR3C1), the level of DH and their interaction. To assess the stress system functioning the TSST protocol was used.RESULTS:Our findings show that higher NR3C1 DNAm in interaction with higher levels of daily hassles, is associated with blunted HPA axis reactivity to psychosocial stress. In addition, higher levels of DH are associated with extended HPA axis stress recovery. In addition, participants with higher NR3C1 DNAm had lower ANS adaptability to stress, specifically lower parasympathetic withdrawal; for heart rate variability this effect was strongest for participants with higher level of DH.CONCLUSIONS:The observation that interaction effects between NR3C1 DNAm levels and daily stress on the functioning of the stress-systems, are already detectable in young adolescents, highlights the importance of early interventions, not only in the case of trauma, but also daily stress. This might help to prevent stress-induced mental and physical disorders later in life.

Young adolescents are hypothesized to differ in their environmental sensitivity, at both phenotypic (i.e., Sensory Processing Sensitivity [SPS]) and physiological (i.e., biological stress response) level. This is the first study that investigated whether individual differences in environmental sensitivity at physiological level could be predicted by individual differences at phenotypic level, as measured with the HSC scale. A total of 101 adolescents (Mage = 11.61, SDage = 0.64) participated in a standardized social stress task (i.e., Trier Social Stress Task-Modified version for children and adolescents (TSST-M)). From baseline to the end of recovery, eight cortisol samples were collected, as well as a continuous measure of Autonomic Nervous System activity. Adolescents reported on SPS and on perceived stress before, during, and after TSST-M. As a follow-up analysis, the quality of the environment, the possible overlap with Neuroticism, and several covariates were considered. Multilevel models were used to investigate within- and between-person differences in stress reactivity across different systems. Results indicate significant individual differences in heart rate, heart rate variability, skin conductance, cortisol, and perceived stress in response to the TSST-M. Only for perceived stress significant differences in SPS were observed, with more sensitive individuals perceiving more negative and less positive affect. For environmental quality and the interaction between SPS and Neuroticism results showed higher recovery rates of heart rate in high quality environments and stronger cortisol responses for adolescents scoring high on both SPS and Neuroticism. Potential explanations for these findings and implications for current theorizing on environmental sensitivity are discussed.

Children differ in their sensitivity to positive and negative environmental influences, which can be measured with the Highly Sensitive Child (HSC) scale. The present study introduces the HSC-21, an adaptation of the original 12 item scale with new items and factor structure that are meant to be more informative than the original ones. The psychometric properties of the HSC-21 were investigated in 1,088 children across Belgium and the Netherlands, including child and mother reports. Results showed evidence for (a) bifactor model with a general sensitivity factor and two specific factors (i.e., Ease of Excitation-Low Sensory Threshold and Aesthetic Sensitivity); (b) (partial) measurement invariance across gender, developmental stage, country, and informants; (c) moderate child-mother agreement; (d) good reliability; (e) normally distributed item scores; and (f) meaningful associations with personality and temperament across both samples. No evidence was found for HSC-21 as a moderator in the relationship between parenting and problem behaviors.

The current paper presents a detailed examination of a lay theory perspective on the Sensory-Processing-Sensitivity (SPS) personality profile within the Five-Factor Model (FFM) of personality. The lay SPS personality profile was assessed by asking self-identified highly sensitive people to rate themselves on a Five-Factor Model questionnaire (NEO-PI-3). We applied the NEO-PI-3 norms (domains and facets) and examined the inter-rater agreement of the facets. The sample consisted of 560 (female: 86.43%, M-age = 37.36 years, SDage = 6.64 years, 18.17-47.42 years) self-identified highly sensitive adults. Six facets, in particular, stood out with good and very good inter-rater agreement: participants fell within the highest 23% of the population on facets Fantasy, Aesthetics, Feelings (Openness to Experience); Anxiety, Depression (Neuroticism); and the lowest 23% of the population on the facet Gregariousness (Extraversion).

Due to exponential growth of Internet of Things (IoT) devices, the volume of data exchanged between IoT devices has increased drastically. Most IoT systems handle sensitive and confidential information with low-resource applications. For low-resource devices conventional encryption techniques are unsuitable. Ciphers are used for encrypting information on those devices to compensate for security and power consumption requirements. The objective of this study is to explore ways of improving the effectiveness and power consumption of low-resource IoT technologies in chip design using lightweight cryptography. This research work introduces an effective power algorithm to improve the low-resource IoT device which enables critical messages to be encrypted in low-power mode. For lightweight cipher performance metrics, we have created a simple and efficient model. The experimental analysis of mathematical model for power consumption in terms of using various power parameters has been compared and validated.

The current paper presents an examination of the associations between Five-Factor Model (FFM) personality facets and Sensory Processing Sensitivity (SPS) to understand which personality facets are especially relevant for SPS. Associations between SPS and the FFM personality domains and facets were examined in older adolescents and young adults (Study 1) as well as older children and young adolescents (Study 2). The most relevant facets were within the Neuroticism and Openness domains, although not all facets were equally important. Especially facets regarding internalizing tendencies and – in older adolescents and young adults – openness to aesthetics showed highest association with SPS. Facets of Extraversion were less associated to SPS. Facets of domains Agreeableness and Conscientiousness showed almost no relevance to SPS.

Adolescents differ in their degree of Environmental Sensitivity , that is, the ability to perceive and process information about their environment. The present study aimed to investigate the psychometric properties of the Highly Sensitive Child scale (HSC), a self-report measure of Environmental Sensitivity , in two Belgian and UK samples with a total of 3056 adolescents. First, the factor structure, internal consistency, dimensionality, and construct validity of the HSC scale were examined. Second, measurement invariance of the HSC scale across developmental stage, gender, and country was tested. Results supported a bifactor model with a general sensitivity factor and three group factors: Ease of Excitation (EOE), Low Sensory Threshold (LST), and Aesthetic Sensitivity (AES). Cronbach’s alpha and McDonalds’s (hierarchical) omega indicated that the HSC scale is a reliable measure of Environmental Sensitivity , except for AES. Furthermore, AES was associated with different personality traits than EOE and LST. Second, the HSC scale was partially measurement invariant across developmental stage, gender, and country. The results provide important insights in the psychometrics of a first measurement of Environmental Sensitivity in early to late adolescents. Implications for further research are discussed.

Repetitive negative thinking (RNT) is a transdiagnostic vulnerability factor, involved in the maintenance of a variety of emotional problems. Recently, the Perseverative Thinking Questionnaire – Child version (PTQ-C) was developed as a content-independent measure of RNT in children and adolescents. The current study investigated the reliability and predictive validity of the PTQ-C and examined temperament as a developmental predictor of RNT. For this end, 701 early adolescents completed measures of RNT, depressive symptoms, stressors, and temperament, both at baseline and after three months. First, the factor structure of the PTQ-C was investigated by comparing a one-factor model and a three-factor higher-order model using confirmatory factor analyses. Both models showed good fit to the data, but the more parsimonious one-factor model was retained. Internal consistency, as measured by cronbach's alpha and (hierarchical) omega, was found to be excellent for the total scale. Second, associations with depressive symptom levels were examined. RNT predicted both concurrent and prospective symptom levels, even when taking into account baseline depressive symptoms. RNT was further shown to act as a moderator strengthening the link between stress and levels of depressive symptoms, both concurrently and prospectively. Finally, associations with temperament were explored by investigating the mediating role of RNT in the association between temperament dimensions and depressive symptoms. One indirect effect was found, with low effortful control predicting increases in depressive symptoms through heightened levels of RNT. The current study supports the PTQ-C as a useful and psychometrically sound measure of dysfunctional RNT that may facilitate research on emotional problems in child and adolescent samples.