To thrive as an individual and within society, children need to master the ability to control their behavior and adapt it to social rules and standards. They also need to acquire the social... Show moreTo thrive as an individual and within society, children need to master the ability to control their behavior and adapt it to social rules and standards. They also need to acquire the social competence to interact and communicate with others. Studies showing the relevance of behavioral control and social competence for children’s future development give rise to the search for factors that are associated with these competencies. These factors can be characteristics of the child, factors within the child’s social environment, and factors within the physical and socioeconomic environment. In the current thesis we aimed to identify some of these factors associated with the development of behavioral control in early childhood, and with prosocial behavior in early to mid-adolescence. We assessed four types of behavioral control: parent-reported effortful control, observed cheating behavior, delay of gratification, and response inhibition. For prosocial behavior, one type was assessed: observed compensating behavior towards an excluded peer. The results show that there is quite some variation in children’s level of behavioral control as well as in adolescents’ level of prosocial behavior and that these levels can be related to child characteristics, factors in their social environment, physical, and socioeconomic environment in a meaningful way. Show less
When trying to understand texts, readers engage in various cognitive processes. If all goes well, the engagement in these cognitive processes during reading results in the construction of a... Show moreWhen trying to understand texts, readers engage in various cognitive processes. If all goes well, the engagement in these cognitive processes during reading results in the construction of a coherent mental representation of the text, the essence of successful reading comprehension. To construct such a representation, readers need to monitor the coherence of the text and of their emerging mental representation of what the text is about. The central aim of the empirical studies described is to examine coherence-monitoring processes across development by measuring reader’s ability to detect coherence breaks during reading of narratives. The first part of this dissertation consists of three empirical studies (chapter 2-4). The first study examined whether good and poor comprehenders at age 8-9 and 10-11 detected coherence-breaks during and/or after reading. The second study builds on the first study by examining the protracted development of coherence monitoring in an adolescent population (ages 10-22) using the same task under more challenging circumstances. The third study explored the neural correlates of coherence-break detection in young adults in an fMRI study. The second part of this dissertation consists of two conceptual chapters in which the results are summarized and discussed in a broader theoretical perspective (chapter 5-6). Show less
The current thesis focuses on the longitudinal development of early-adopted children in the 1887/29874 Leiden Longitudinal Adoption Study (LLAS). In the LLAS, adopted children were followed from... Show moreThe current thesis focuses on the longitudinal development of early-adopted children in the 1887/29874 Leiden Longitudinal Adoption Study (LLAS). In the LLAS, adopted children were followed from infancy until young adulthood. In Chapter 1 we discuss the role of sensitive parenting and the precursors and developmental outcomes of attachment security. In the empirical study in Chapter 2 we report on the concurrent as well as longitudinal relations between maternal sensitivity, child temperament, and externalizing behavior problems. In the second empirical study in Chapter 3, we follow this line of enquiry and investigate concurrent and longitudinal relations between maternal sensitivity, child temperament and internalizing behavior problems. Chapter 4 reports on the final empirical study of the thesis, and focuses on the associations between maternal sensitivity and attachment in infancy and the diurnal cortisol curve in young adulthood. Our empirical studies show that maternal sensitivity in infancy and middle childhood indirectly predicts fewer internalizing behavior problems in adopted adolescents, and that maternal sensitivity in adolescence predicts less concurrent delinquent behavior. Attachment experiences in early life do not predict the adoptees' diurnal cortisol curve in later life. In Chapter 5 we discuss these results and some methodological issues more thoroughly. Show less
During early adolescence, there is no association between internalizing behaviour and cannabis use. There is an association between externalizing behaviour and cannabis use, where externalizing... Show moreDuring early adolescence, there is no association between internalizing behaviour and cannabis use. There is an association between externalizing behaviour and cannabis use, where externalizing behaviour precedes cannabis use rather than the other way around. Secondly, during adolescence, there is an association between psychosis vulnerability and cannabis use, where cannabis use predicts psychosis vulnerability and vice versa, suggesting a bi-directional cascading association. Thirdly, during early adolescence, the social skill “self-control” was (unexpectedly) unrelated to cannabis use. Cooperation and assertiveness are associated with cannabis use during this life phase, where higher levels of cooperation decrease the chance of using cannabis and higher levels of assertiveness increase the chance of using cannabis during early adolescence. Cooperation and assertiveness did not differentiate between early and late onset of cannabis use or predict frequency of use. In addition, compared to non-users, cannabis users experience problems only in motivational inhibitory control, not in cognitive inhibitory control. Also, cannabis users experience problems in behavioural impulsivity, which is related to motivational inhibitory control. Lastly, cannabis users have problems with social perception in comparison to non-using controls, particularly when these social perception skills involve emotion recognition. Also, heavy cannabis users experience significantly more psychological problems when they have relatively poor social perception skills. Future research must determine whether the behavioural and cognitive concepts and constructs examined in this thesis in relation to cannabis use should be incorporated in prevention and intervention programs. Show less
It is well known that complex mental abilities develop at least until late adolescence. Yet, there are also skills that children master perfectly, sometimes even better than adults. The goal of... Show moreIt is well known that complex mental abilities develop at least until late adolescence. Yet, there are also skills that children master perfectly, sometimes even better than adults. The goal of this thesis was to learn more about the possibilities of cognitive functioning in children and young adults, and the constraints set by the developing brain. An fMRI training approach was used to examine age- and experience-related effects in the development of working memory and resting-state functional connectivity. More specifically, we studied age differences on task performance and brain activation during a working memory task with various demands and difficulty levels, both before and after 6 weeks of practice with the task. In addition, to learn more about the interaction between different brain regions, we also examined age differences and practice effects on functional connectivity during resting-state. Show less
The research described in this thesis aimed to gain insight in risky behavior in adolescence, by examining the development of decision-making in relation to brain development. Chapter 1 describes... Show moreThe research described in this thesis aimed to gain insight in risky behavior in adolescence, by examining the development of decision-making in relation to brain development. Chapter 1 describes two existing possible explanations for adolescent risky behavior, the first explanation focuses on the development of cognitive control, and states that adolescents’ immature ability to control their impulses may bias them to act risky. The second explanation focuses on emotional/motivational processes, and suggests that adolescents engage in risky behavior because they respond stronger to the possible rewards associated with risks than children and adults do. Chapters 2, 3, and 7 describe studies on developmental changes in the processes that form the building blocks of more complex decision-making under risk; probability estimation, reward processing and working memory. Chapters 4, 5, and 6 explore the relative contributions of reward sensitivity and cognitive control to decision-making across development. This thesis shows knowledge about brain maturation can inform models of adolescent risky behavior. And that adolescent risk-taking can be explained as the consequence of the earlier maturation of reward related relative to cognitive control related brain circuitry. Show less
The Adult Attachment Interview (AAI) was developed in the early 1980s to measure an adult’s attachment representation. Since then, it has been applied in more than 100 studies. This thesis aimed to... Show moreThe Adult Attachment Interview (AAI) was developed in the early 1980s to measure an adult’s attachment representation. Since then, it has been applied in more than 100 studies. This thesis aimed to shed light on some of the potentials and limitations of the AAI. We found that coherence, which is an important concept in attachment interviews, is not defined similarly by attachment experts, linguists, and non-experts. Therefore, it seems that a measure for coherence cannot make the AAI more easily accessible for non-attachment experts. Secondly, we showed that the attachment representations of adopted adolescents were related (1) to their own autonomy behaviors and mothers’ relatedness behaviors during a discussion task, (2) to the adolescents’ emotional investment in others, and (3) to the adolescents’ perceived support from others. Intelligence and perceived temperament were not associated with the adolescents’ attachment representation. These results support the validity of the AAI when assessed with (adopted) adolescents. Finally, we revealed that the AAI differentiates between adolescents with divergent physiological responses (interbeat interval reactivity) to attachment relevant situations: dismissing adolescents showed less physiological reactivity during the AAI than secure adolescents, while they appeared to be more stressed during a discussion task with their mothers. Show less
