In the present thesis we report our findings assessing individual differences in perception of infant signals due to early-life experiences and variability in the oxytocinergic system. We found... Show moreIn the present thesis we report our findings assessing individual differences in perception of infant signals due to early-life experiences and variability in the oxytocinergic system. We found that the perception of infant cues differs between individuals with fewer versus more experiences of emotional maltreatment (Chapter 5). These adverse experiences seem to change the activity and responsiveness of the oxytonergic system, such that higher levels of oxytocin are secreted, which in turn are associated with a more positive evaluation of infant mood (Chapter 2). Moreover, intranasal administration decreases the memory for negative infant cues in individuals who experienced childhood emotional maltreatment (Chapter 4). Our results may suggest that developmental changes in the oxytonergic system might help maltreated individuals to be open to new, potentially positive relationship experiences and to facilitate new attachments. Moreover, we suggest that reward training might be helpful in changing individuals__ perception of an infant for the better (Chapter 3). Overall, our findings might serve as a first step toward identifying cognitive and neurobiological mechanisms that might help to improve (future) parenting Show less
Increasing evidence suggests that perception and action planning do not represent separable stages of a unidirectional processing sequence, but rather emerging properties of highly interactive... Show moreIncreasing evidence suggests that perception and action planning do not represent separable stages of a unidirectional processing sequence, but rather emerging properties of highly interactive processes. To capture these characteristics of the human cognitive system, we have developed a connectionist model of the interaction between perception and action planning: HiTEC, based on the Theory of Event Coding (Hommel, M_sseler, Achschersleben & Prinz, 2001). The model is characterized by representations at multiple levels and by shared representations and processes. It complements available models of stimulus__response translation by providing a rationale for (1) how situation-specific meanings of motor actions emerge, (2) how and why some aspects of stimulus__response translation occur automatically and (3) how task demands modulate sensorimotor processing. The model is demonstrated to provide a unitary account and simulation of a number of key findings with multiple experimental paradigms on the interaction between perception and action such as the Simon effect, its inversion (Hommel, 1993), and action__effect learning. Show less
The aim of this set of studies was to provide more insight in individual characteristics that influence care-giving abilities, in particular precursors of harsh and abusive parenting. We examined... Show moreThe aim of this set of studies was to provide more insight in individual characteristics that influence care-giving abilities, in particular precursors of harsh and abusive parenting. We examined how different subtypes of childhood abuse were related to child abuse potential in adulthood. Emotional neglect in childhood was related to child abuse potential, which is in line with earlier research showing the long-lasting effects of emotional maltreatment and neglect in childhood. With regard to the effects of oxytocin on the neural basis of parenting, we used fMRI to examine how oxytocin influenced emotion recognition using pictures of both adult and infant faces, taking experiences of maternal love withdrawal into account as potential moderator. Oxytocin enhanced neural activity in regions involved in emotion processing, such as the IFG, insula and STG. Our findings regarding the moderating role of experiences of maternal love withdrawal are inconsistent for emotion recognition in adult faces and in infant faces. Lastly, a new paradigm (LISSA) to observe sensitivity in response to standardized infant cues was developed and tested. Our results show that sensitivity can be reliably assessed using this procedure, making the LISSA a promising method for future research and clinical practice. Show less
Children with hearing loss are at risk for developing psychopathology, which has detrimental consequences for academic and psychosocial functioning. Therefore, the aims of this thesis were to... Show moreChildren with hearing loss are at risk for developing psychopathology, which has detrimental consequences for academic and psychosocial functioning. Therefore, the aims of this thesis were to objectify levels of psychopathology in hearing-impaired children, and to investigate the influence of various risk and protective factors on psychopathology. The first result of this large multi-center study was that children with hearing loss were more prone to developing psychopathology than their normally hearing counterparts. The second outcome entailed that cochlear implants recipients equaled to or outperformed children with hearing aids involving their levels of psychopathology. Moreover, for several psychopathological symptoms, children that received cochlear implants were comparable to normally hearing children, which is a very positive outcome for the cochlear implant children. Thirdly, several factors that impacted levels of psychopathology were identified. For example, children at mainstream schools using well-developed spoken language, have low risks for developing psychopathology. On the basis of this thesis, it was concluded that it is not the severity of hearing loss that contributes to the genesis of psychopathology, but many other factors. This necessitates clinicians to always consider the heterogeneity of the HI population, in order to improve personalized screening and treatment trajectories. Show less
In conclusion, the results of the present studies show how schizotypal symptoms may develop following child psychiatric psychopathology and how these symptoms unfavorably influence a persons__... Show moreIn conclusion, the results of the present studies show how schizotypal symptoms may develop following child psychiatric psychopathology and how these symptoms unfavorably influence a persons__ quality of life. It is important for clinicians to be aware of the complex dynamics of psychopathology and the higher risk for adult schizotypal symptomatology following behavioral problems and psychiatric disorders at child and adolescent age. Show less
The main focus of the current dissertation is on the associations between self-regulation and academic outcomes, with special attention to these issues in ethnic minority children. Following a... Show moreThe main focus of the current dissertation is on the associations between self-regulation and academic outcomes, with special attention to these issues in ethnic minority children. Following a systematic meta-analysis on the association between cognitive self-regulation and academic achievement regardless of ethnic group, two empirical studies focus on self-regulation and aspects of education in ethnic minority children specifically, examining self-regulatory capacities in relation to educational attainment, and the relation between the transition to primary school and the development of self-regulation. In Chapter 2, flexible thinking that is an important contributor to cognitive self-regulation (i.e., executive function), was found to be positively and substantially related to math and reading performance. The findings of Chapter 3 showed that behavioral self-regulation (i.e., effortful control) is related to educational attainment with respect to secondary school tracks via self-efficacy in Turkish minority preadolescents. Chapter 4 provided evidence that children showed differential gains in flexible thinking from kindergarten to formal schooling, as less able children made more progress following the transition. The findings provided evidence for the important role of self-regulation in school performance and for the role of the transition to formal schooling in shaping the development of higher-order cognitive processes that contribute to self-regulation. Show less
How often does child maltreatment occur in the Netherlands and which factors increase the risk of child maltreatment? In this thesis we describe the findings of two epidemiological studies aimed at... Show moreHow often does child maltreatment occur in the Netherlands and which factors increase the risk of child maltreatment? In this thesis we describe the findings of two epidemiological studies aimed at answering these questions. First, in the Netherlands__ Prevalence study on Maltreatment of children and youth (NPM-2010) we examined the year prevalence of child maltreatment in the general Dutch population, using sentinel reports, substantiated CPS reports, and high school students__ self-report. Overall prevalence rates were 33.8 per 1,000 children based on combined sentinel and CPS reports and 99.4 per 1,000 based on self-report. Important risk factors for maltreatment were low SES, single parent families, large families, stepfamilies, and immigrant status. Second, we examined the year prevalence of child sexual and physical abuse in residential and foster care. Children without disabilities had an increased risk of sexual abuse in residential care, and an increased risk of physical abuse in both types of care compared to the general population. Children with a mild intellectual disability were at increased risk of sexual abuse in both residential and foster care compared to regular out-of-home care and compared to the general population. Findings presented in this thesis contribute to the prevention of future child maltreatment in different care settings. Show less
Core deficits in people with autisme spectrum disorders (ASD) are difficulties in adapting their behaviour to the social environment which hampers the possibilities to communicate adequately and to... Show moreCore deficits in people with autisme spectrum disorders (ASD) are difficulties in adapting their behaviour to the social environment which hampers the possibilities to communicate adequately and to have reciprocal relationships. These problems have a serious impact on functioning in their daily life. Since ASD are severe and lifelong conditions, it is relevant to examine how children with ASD develop troughout their life and to investigate which factors constitute an unfavourable contribution to their development. This thesis reveals that children with ASD are at specific risk of poor quality of life in adulthood when compared to children with other psychiatric disorders. Secondly, the impact of ASD on specific domains of intellectual functioning is different at different ages, implicating that re-evaluation of cognitive function during development of children with ASD is recommended during their life. Thirdly, children with ASD who are at risk of schizophrenia spectrum pathology, may show negative schizotypal symptoms, but also disorganized and positive symptoms in addition to ASD symptomatology. These symptoms of schizotypy appear to be associated with inhibition problems. We should be aware of inhibition problems in children with ASD because they may be indicators of high risk to schizophrenia spectrum pathology later in life. Show less
We investigated the effects of two novel treatments for posttraumatic stress disorder (PTSD). The first treatment is Attentional Bias Modification (ABM). This treatment for anxiety disorders has... Show moreWe investigated the effects of two novel treatments for posttraumatic stress disorder (PTSD). The first treatment is Attentional Bias Modification (ABM). This treatment for anxiety disorders has become quite popular in a relatively short time and was featured in recent articles in the New York Times and The Economist. ABM is a brief, computerized treatment in which patients are trained to keep their attention away from the threatening stimuli from which they automatically attend. Since attentional bias (AB) is considered an important feature of PTSD, we tested ABM in a randomized controlled trial. ABM did not effect PTSD, nor did it change AB. We also investigated an individualized version of ABM in a case series and saw no therapeutic effects. Since the current popularity of ABM is based on smaller studies than our RCT, dissemination efforts may have to be reconsidered. Next, we explored the usefulness of a 8-week course of mindfulness-based cognitive therapy (MBCT) in a pilot study with patients with chronic PTSD. No adverse effects were observed and patients evaluated the course positively. About half of the patients who finished MBCT demonstrated positive clinical effects. However, considering the early dropout rate, different formats may have to be developed to increase its acceptability in this group. Show less
Morality is of particular importance to people: People want to be considered moral and want to belong to moral groups. Consequently, morality judgments have the potential to motivate individuals to... Show moreMorality is of particular importance to people: People want to be considered moral and want to belong to moral groups. Consequently, morality judgments have the potential to motivate individuals to behave in ways that are considered to be ‘good’. In the current dissertation, I examined the impact of intragroup morality judgments on group members’ motivational responses, and compared those to competence judgments as an alternative domain of evaluation. In three empirical chapters, I investigated the impact of morality (vs. competence) judgments from different perspectives, namely judgments of 1) group member’s own prior behavior, 2) another group member’s behavior, as well as 3) the behavior of a prospective group member. The central hypothesis was that intragroup morality judgments generally impact more strongly on group members’ motivational responses than competence judgments. The results demonstrated that the motivational force of morality largely pertains to immorality. Judgments of immorality elicit a range of motivational responses in group members, such as negative affect, lowered perceived coping abilities, a cardiovascular pattern indicative of threat rather than challenge, and a greater inclination towards social exclusion. In conclusion, morality judgments—generally more so than competence judgments—impact on group members’ striving to be a ‘good’ group member. Show less
The Philippine crocodile is a critically endangered species, endemic to the Philippine Islands. Indiscriminate hunting, the use of destructive fishing practices and the conversion of wetland... Show moreThe Philippine crocodile is a critically endangered species, endemic to the Philippine Islands. Indiscriminate hunting, the use of destructive fishing practices and the conversion of wetland habitat into rice fields continue to threaten the few remaining Philippine crocodile populations in the wild. This thesis describes the in-situ conservation efforts for the species in the northern Sierra Madre on Luzon by the Mabuwaya Foundation. Traditions, emotions and ethics form important reasons for rural communities in the northern Sierra Madre to support the conservation of the Philippine crocodile in their surroundings. But in contemporary conservation discourses such an argument is easily dismissed as hopelessly romantic, elitist or even irrational. In fact raising awareness, fostering pride and empowering rural communities to protect the resources they need and value is, in the end, a more pragmatic, pro-poor and rea listic strategy to mobilize local support for the protection of the Philippine crocodile than a narrow focus on generating economic incentives. Conservation efforts can be significantly strengthened if cultural and intrinsic values are taken into account. Pride, interest and respect offer the best hope for the survival of the Philippine crocodile in the 21st century. Show less
As infants are fully dependent on their parents, correct perception and interpretation of infant signals is crucial for infant survival. It is therefore not surprising that specific brain circuits... Show moreAs infants are fully dependent on their parents, correct perception and interpretation of infant signals is crucial for infant survival. It is therefore not surprising that specific brain circuits and neuroendocrine processes have evolved to perceive infant signals correctly and to respond adequately. However, parents vary in their ability to respond to their infants in a sensitive way and several factors may be involved in parental sensitive responsiveness. One important factor influencing parenting behavior is the neuropeptide oxytocin. Of all the hormones involved in parenting and other social behaviors, oxytocin has received the most interest, as evidenced by the high number of scientific studies over the past decade (Bos, Panksepp, Bluthé, & Honk, 2012; Van IJzendoorn & Bakermans-Kranenburg, 2012). Many studies suggest that oxytocin is related to sensitive parenting (Bakermans-Kranenburg & Van IJzendoorn, 2008; Feldman, Weller, Zagoory-Sharon, & Levine, 2007), although the exact mechanism underlying this positive association is not entirely clear yet. Another factor that influences parenting behavior is adult state of mind with respect to attachment (Van IJzendoorn, 1995). In the current dissertation, the role of oxytocin and adult attachment in parenting is examined with a series of functional magnetic resonance imaging experiments. Show less
This thesis describes the role of a problem solvingintervention approach in improving quality of work and well-being of healthcare employees. The promising results of a problem solving intervention... Show moreThis thesis describes the role of a problem solvingintervention approach in improving quality of work and well-being of healthcare employees. The promising results of a problem solving intervention as wellas the strength and limitations of it, point at the possible importance ofproblem solving research within the field of health care employeesinterventions. The study limitations that are described in the generaldiscussion, however, also point at the need for carefull interpretation of thestudy results. Therefor, more extensive research is needed to furtherunderstand the interventional and theory based mechanisms that underlie healthcare employees problem solving behaviors. There is stil much more to know aboutthe role of specific problem solving mechanisms in health care interventions.Implementing the results of this thesis in future problem solving studies inhealth care employees might bring the appli cation of problem solving theory inthe field of worksite health promotion up to a next level. Show less
I theorized that if redressing inequality becomes a way for dominant group members (i.e., Whites) to boost their group‘s moral standing (i.e., as fair and just), resistance to increased equality... Show moreI theorized that if redressing inequality becomes a way for dominant group members (i.e., Whites) to boost their group‘s moral standing (i.e., as fair and just), resistance to increased equality among these group members might decrease, thereby increasing opportunities for social change. Thus, I examined the effect of morality framing—i.e., presenting social equality as a moral ideal versus a moral obligation—on Whites‘ responses to social inequality. In Chapter 2 it is demonstrated that exposure to the moral ideal (vs. obligation) frame elicits more positive intergroup attitudes among Whites. In Chapter 3 it is established that giving a speech about equality as a moral ideal (rather than as a moral obligation), elicits cardiovascular (CV) reactivity and speech rates among Whites that are consistent with less relative threat and vigilance. However, studies in Chapter 4 show that during contact with a Black confederate, prior exposure to the moral ideal (vs. obligation) frame elicits CV reactivity among Whites consistent with greater relative threat. CV reactivity was reliably predicted by more positive intergroup attitudes, and thus, heightened threat during intergroup contact can indicate the psychological cost of caring. These findings can inform policy and interventions aimed at increasing commitment toward equality. Show less
Regular participation in moderate-intensity physical activity (PA) is beneficial for patients with rheumatoid arthritis (RA); however, a large proportion of patients with RA are not physically... Show moreRegular participation in moderate-intensity physical activity (PA) is beneficial for patients with rheumatoid arthritis (RA); however, a large proportion of patients with RA are not physically active. In this dissertation, we describe the pilot-testing of an intervention to promote PA among patients with RA, as well as several preliminary studies which informed the development of the intervention. These preliminary investigations identified autonomous motivation, self-efficacy, PA goal achievement and use of self-regulation techniques as important predictors of PA behavior change. As such, and based on existing literature, motivational interviewing (MI) and self-regulation coaching (SR) were selected as intervention techniques which could impact upon these variables. In a randomized controlled trial, the combined MI+SR intervention led to increased autonomous motivation, self-efficacy and physical activity comp ared to a patient education control group over 32 weeks. Process analyses revealed that autonomous motivation and use of self-regulation skills explained the sustained increases in PA behavior, and that certain characteristics of MI sessions explained changes in autonomous motivation and PA. Despite increasing their PA, patients who received the intervention did not improve on any disease related variables. Practical implications of the findings are discussed. Show less
The goal of this dissertation was to enhance our understanding about internalizing problems and peer relations in DHH youth (aged around 11 years). This was done along principles of the... Show moreThe goal of this dissertation was to enhance our understanding about internalizing problems and peer relations in DHH youth (aged around 11 years). This was done along principles of the developmental psychopathology framework in which DHH children were compared to their hearing counterparts and in which multiple (underlying) social-emotional factors were examined. Results showed that DHH youth reported equal levels of somatic complaints, but more depressive symptoms, lower friendship quality and some forms of victimization more than their hearing peers. Throughout the dissertation a recurring DHH-related characteristic causing variability within the DHH sample was type of education; DHH children in special education reported poorer outcomes than their DHH peers in mainstream education. Concerning the underlying factors, a key finding was that emotional functioning underlies the development of internalizing problems and peer relations in both DHH and hearing youth, while the influence of social factors caused a discrepancy between the two groups. For example, poor social understanding is related to depressive symptoms in DHH youth, while this relation is absent in the hearing sample. Peer relations and social understanding should receive focal attention in practice and future research with DHH youth. Show less
Why are small states statistically more likely to have democratic systems of government? By addressing this question from a qualitative, comparative methodological angle, this book analyzes the... Show moreWhy are small states statistically more likely to have democratic systems of government? By addressing this question from a qualitative, comparative methodological angle, this book analyzes the effects of a limited population size on politics and democracy. In line with the criteria of the most different systems design, the four microstates of San Marino, St. Kitts and Nevis, Seychelles, and Palau are compared on the basis of interviews with respondents from various societal and institutional backgrounds. The findings of this study indicate that in spite of their many other differences, politics and democracy in the four analyzed microstates is of a remarkably similar nature. Whereas a small population size may in some respects contribute to the quality of democracy, it also creates a number of political dynamics that undermine the functioning of democratic government 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
The development of self-regulation is one of the major challenges of a child’s healthy development. In the current thesis, the contribution and interplay of parental and biological factors in... Show moreThe development of self-regulation is one of the major challenges of a child’s healthy development. In the current thesis, the contribution and interplay of parental and biological factors in the development of self-regulation in preschoolers are studied in a large population-based cohort, the Generation R Study. We found that attachment insecurity in infancy was related to higher levels of toddler active resistance during Clean-Up. Maternal negative discipline was related to lower levels of committed compliance in toddlers, and the association between maternal positive discipline and child committed compliance was moderated by the child’s COMT rs4680 genotype, indicating that the association was stronger in children with the Met/Met variant than for children with other COMT genotypes. Maternal family-related stress during pregnancy predicted lower levels of toddler committed compliance through lower levels of maternal positive discipline. Maternal sensitivity was associated with lower levels of executive function problems and lower levels of internalizing problems in preschool age. In children with a relatively short corpus callosum in infancy, higher levels of maternal positive discipline predicted lower levels of inhibition problems. Our studies demonstrate the role of various aspects of positive parenting and mother-child relationship quality in preschool children’s regulation of emotions and behavior. Show less
Based on rural fieldwork in Tanzania and Vietnam, this book describes the difference in organisation of cashew production, between highest producing areas by analysing the lower level of the cashew... Show moreBased on rural fieldwork in Tanzania and Vietnam, this book describes the difference in organisation of cashew production, between highest producing areas by analysing the lower level of the cashew value chain. Using a comparative analysis the book explores the dynamic process of how cashew farmers, of the two countries, are integrated in the existing production set up. The importance of choice through economic freedom is explored by analysing the functioning of different actors to allow or hinder advancement in production and productivity. Show less
