The sibling relationship is a unique and long lasting relationship for individuals, which contributes to the social development of a child. During childhood and adolescence, the relationship...Show moreThe sibling relationship is a unique and long lasting relationship for individuals, which contributes to the social development of a child. During childhood and adolescence, the relationship between siblings changes especially in the amount of warmth and conflict between them. Previous research shows that the experience of differential parenting can cause feelings of jealousy, which in turn affects the quality of the sibling relationship in forms of less warmth and more physical or psychological aggression. The current cross-sectional study examined the relation between differential parenting and physical or psychological aggression between siblings and the potential moderating role of the warmth within the sibling relationship. The sample consisted of 22 children between 9 and 18 years old and their 19 younger siblings also between 9 and 18 years old. The study used online self-report questionnaires to measure the experienced differential parenting (SIDE), sibling physical and/or psychological aggression (CTS2-SP) and the perceived warmth within the sibling relationship (SRQ-S). The results showed a significant relation between differential parenting and psychical or psychological aggression within the sibling relationship for the youngest siblings. This means that when the youngest sibling is experiencing differential parenting, there also will occur more physical or psychological aggression. This relation remained significant when controlling for warmth between the sibling relationship. This relation was not found for the older siblings, which means that when the older siblings experience differential parenting this will not lead to physical or psychological aggression. No significant moderation effect was found for warmth within the sibling relationship on the relation between differential parenting and physical and/or psychological aggression for both the oldest and youngest siblings. Future research should focus more on the possibilities that sibling relationships can offer, especially which protective role a sibling relationship might have. It is also important that parents become more aware of how their children might experience certain parental behavior and what consequences this might have.Show less
Research master thesis | Developmental Psychopathology in Education and Child Studies (research) (MSc)
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Individual differences in behavior are best explained through a multisystem approach by integrating neurobiological, neurocognitive, and social environmental factors. This longitudinal study...Show moreIndividual differences in behavior are best explained through a multisystem approach by integrating neurobiological, neurocognitive, and social environmental factors. This longitudinal study examined whether early physical aggression could be predicted by stress regulation, inhibitory control, risk background, and sex. In addition, this study is among the first to investigate whether the four stress response patterns of the Adaptive Calibration Model (Del Giudice et al., 2011) could be generalized to 12-month-old children by studying: autonomic nervous system (ANS), sympathetic nervous system (SNS), parasympathetic nervous system (PNS), and hypothalamic pituitary adrenal (HPA) axis. ANS was indexed by heart rate, SNS by salivary alpha-amylase and pre-ejection period, PNS by respiratory sinus arrhythmia, and HPA axis by salivary cortisol. The sample consisted of 214 mother-child dyads (116 boys) with an equal number of high- and low-risk backgrounds. Physical aggression was assessed through maternal reports at 12, 20, and 30 months of age. At 12 months, children performed an inhibitory control task and the fear task (robot paradigm) was used to measure baseline, response, and recovery levels of the stress systems. Latent profile analysis revealed three profiles: (1) ANS Responders, (2) Moderate Arousal, and (3) Hormonal Responders. No significant differences were found between the profiles with regard to inhibitory control, average age of mother and child, number of boys and girls, and number of high- and low-risk children. Results showed that higher physical aggression scores were associated at 12 months with ANS Responders and lower inhibitory control, at 20 months with Hormonal Responders, boys and high-risk, and at 30 months with boys and high-risk. In addition, an interaction effect was found at 20 months: higher inhibitory control in girls was associated with lower physical aggression scores, but not in the Hormonal Responders. The discussion highlights the importance of using a multisystem approach to explain individual differences in early physical aggression.Show less
Physical aggression occurs already at age of twelve months and although most children learn to regulate their behavior, in some children the aggressive behavior exists until adulthood. Little is...Show morePhysical aggression occurs already at age of twelve months and although most children learn to regulate their behavior, in some children the aggressive behavior exists until adulthood. Little is known about the causes of persistence of aggressive behavior in children. Some studies with mostly older participants found a correlation with stress reactivity. Therefore in this study the correlation between physiological response (pre-ejection period and heart rate), behavioral response (intensity of facial fear, intensity of distress vocalizations and intensity of bodily fear) and self-regulation (self/object engagement and attention to the researcher) will be examined in relation to aggressive behavior in twelve-months-old children (N = 71). Mother and child visited the Leiden University and child’s behavior during the Fear task, a stressful task in which a robot enters the room and walks to the child while the child sits in a seat, was video-taped. Child’s physiology was recorded with the help of the Vrije Universiteit Ambulatory Monitoring System (VU-AMS). Mothers filled out the Cardiff Infant Contentiousness Scale (CICS) and The Physical Aggression Scale for Early Childhood (PASEC) for measuring the degree of aggressive behavior. A significant positive correlation between heart rate and behavior response was found. No significant correlation was found between pre-ejection period and behavioral response, nor between physiology, behavioral response and self-regulation. Aggressive behavior couldn’t be forecasted by physiology, behavioral response and self-regulation. These results are discussed en recommendations are done in context of further research on stress reactivity, development of self-regulation and aggression.Show less
