| 1. |
- Carlsson, Torkel, et al.
(författare)
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Early environmental risk factors for neurodevelopmental disorders - a systematic review of twin and sibling studies
- 2021
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Ingår i: Development and psychopathology (Print). - : Cambridge University Press. - 0954-5794 .- 1469-2198. ; 33:4, s. 1448-1495
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Forskningsöversikt (refereegranskat)abstract
- While neurodevelopmental disorders (NDDs) are highly heritable, several environmental risk factors have also been suggested. However, the role of familial confounding is unclear. To shed more light on this, we reviewed the evidence from twin and sibling studies. A systematic review was performed on case control and cohort studies including a twin or sibling within-pair comparison of neurodevelopmental outcomes, with environmental exposures until the sixth birthday. From 7,315 screened abstracts, 140 eligible articles were identified. After adjustment for familial confounding advanced paternal age, low birth weight, birth defects, and perinatal hypoxia and respiratory stress were associated with autism spectrum disorder (ASD), and low birth weight, gestational age and family income were associated with attention-deficit/hyperactivity disorder (ADHD), categorically and dimensionally. Several previously suspected factors, including pregnancy-related factors, were deemed due to familial confounding. Most studies were conducted in North America and Scandinavia, pointing to a global research bias. Moreover, most studies focused on ASD and ADHD. This genetically informed review showed evidence for a range of environmental factors of potential casual significance in NDDs, but also points to a critical need of more genetically informed studies of good quality in the quest of the environmental causes of NDDs.
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| 2. |
- Frick, Matilda A., et al.
(författare)
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Can reactivity and regulation in infancy predict inattentive and hyperactive/impulsive behavior in 3-year-olds?
- 2019
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Ingår i: Development and psychopathology (Print). - 0954-5794 .- 1469-2198. ; 31:2, s. 619-629
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Tidskriftsartikel (refereegranskat)abstract
- A need to identify early infant markers of later occurring inattentive and hyperactive/impulsive behaviors has come to the fore in the current attention-deficit/hyperactivity disorder literature. The purpose of such studies is to identify driving mechanisms that could enable early detection of attention-deficit/hyperactivity disorder liability and thus facilitate early intervention. Here we study independent and interactive effects of cognitive regulation (inhibition and sustained attention), temperament (reactive and regulatory aspects), and maternal sensitivity (as external regulation) in a sample of 112 typically developing 10-month-old infants (59 boys, 52.7%), in relation to inattentive and hyperactive/impulsive behavior at 3 years. The results showed that infant temperamental regulation and maternal sensitivity made independent contributions to both inattention and hyperactivity/impulsivity, in that higher levels of temperamental regulation and maternal sensitivity were related to less inattentive and hyperactive/impulsive behavior. In addition, the temperamental factor positive affectivity/surgency made a significant contribution to later hyperactivity/impulsivity, in that higher levels of positive affectivity/surgency were related to more hyperactive/impulsive behavior. No interaction effects were found. Our findings suggest temperament and parental regulation as potential and independent markers of later inattentive and hyperactive/impulsive behavior.
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| 3. |
- Grigorenko, Elena L., et al.
(författare)
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Exploring interactive effects on genes and environments in etiology of individual differences in reading comprehension
- 2007
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Ingår i: Development and Psychopathology. - 0954-5794 .- 1469-2198. ; 19:4, s. 1089-1103
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Tidskriftsartikel (refereegranskat)abstract
- It is established that reading and reading-related processes are heritable; genes thus play an important role in the foundation of individual differences in reading. In this article, we focus on one facet of reading–comprehension. Comprehension is a higher order cognitive skill that requires many other cognitive processes for it to unfold completely and successfully. One such process is executive functioning, which has been associated with genetic variation in the catechol-O-methyltransferase (COMT) gene. Genotypes and haplotypes of four single nucleotide polymorphisms in COMT were investigated in 179 incarcerated adolescent delinquents. Four hierarchical logistic regression models predicting the presence/absence of comprehension difficulties were fitted to the data; genetic variation in COMT and the presence/absence of maternal rejection were investigated as main effects and as effects acting interactively. Three out of four interaction terms were found to be important predictors of individual differences in comprehension. These findings were supported by the results of the haplotype analyses, in which the four investigated polymorphisms were considered simultaneously.
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| 4. |
- Kleberg, Johan L., et al.
(författare)
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Increased pupil dilation to happy faces in children with hyperactive/impulsive symptoms of ADHD
- 2021
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Ingår i: Development and psychopathology (Print). - : Cambridge University Press. - 0954-5794 .- 1469-2198. ; 33:3, s. 767-777
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Tidskriftsartikel (refereegranskat)abstract
- Attention-deficit/hyperactivity disorder (ADHD) is associated with disrupted emotional processes including impaired regulation of approach behavior and positive affect, irritability, and anger. Enhanced reactivity to emotional cues may be an underlying process. Pupil dilation is an indirect index of arousal, modulated by the autonomic nervous system and activity in the locus coeruleus-noradrenergic system. In the current study, pupil dilation was recorded while 8- to 12- year old children (n = 71, 26 with a diagnosis of ADHD and 45 typically developing), viewed images of emotional faces. Parent-rated hyperactive/impulsive symptoms were uniquely linked to higher pupil dilation to happy, but not fearful, angry, or neutral faces. This was not explained by comorbid externalizing symptoms. Together, these results suggest that hyperactive/impulsive symptoms are associated with hyperresponsiveness to approach-related emotional cues across a wide range of symptom severity.
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| 5. |
- O'Donnell, Deborah A, et al.
(författare)
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The mediating role of alienation in the development of maladjustment in youth exposed to community violence.
- 2006
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Ingår i: Development and psychopathology (Print). - 0954-5794 .- 1469-2198. ; 18:1, s. 215-32
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Tidskriftsartikel (refereegranskat)abstract
- A study was conducted to determine predictors of high risk/delinquent behavior and psychoemotional maladjustment in 1,478 sixth and eighth graders who took part in a survey of high-risk and adaptive behaviors. The first goal was to determine the extent to which two distinct dimensions of alienation, normlessness, and isolation/self-estrangement mediated the emergence of maladjustment in youth exposed to community violence. The second goal was to distinguish between violence witnessing and violence victimization, and determine whether these subtypes of violence exposure may differentially affect the proposed mediational factors. The results indicated that normlessness partially mediated the relationship between violence exposure and high-risk/delinquent behavior and between violence exposure and psychoemotional maladjustment. Isolation/self-estrangement partially mediated the relation between violence exposure and psychoemotional maladjustment. Although witnessing of, and victimization by, violence were both significant predictors of normlessness, only violent victimization was significantly linked to isolation/self-estrangement. These results elucidate the mechanisms by which community violence exposure may exert negative influences on youth and suggest that there are distinct patterns of risk associated with different forms of exposure.
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| 6. |
- Olofsdotter, Susanne, et al.
(författare)
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Differential susceptibility effects of oxytocin gene (OXT) polymorphisms and perceived parenting on social anxiety among adolescents
- 2018
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Ingår i: Development and psychopathology (Print). - : CAMBRIDGE UNIV PRESS. - 0954-5794 .- 1469-2198. ; 30:2, s. 449-459
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Tidskriftsartikel (refereegranskat)abstract
- Social anxiety is one of the most commonly reported mental health problems among adolescents, and it has been suggested that parenting style influences an adolescent's level of anxiety. A context-dependent effect of oxytocin on human social behavior has been proposed; however, research on the oxytocin gene (OXT) has mostly been reported without considering contextual factors. This study investigated the interactions between parenting style and polymorphic variations in the OXT gene in association with social anxiety symptoms in a community sample of adolescents (n = 1,359). Two single nucleotide polymorphisms linked to OXT, rs4813625 and rs2770378, were genotyped. Social anxiety and perceived parenting style were assessed by behavioral questionnaires. In interaction models adjusted for sex, significant interaction effects with parenting style were observed for both variants in relation to social anxiety. The nature of the interactions was in line with the differential susceptibility framework for rs4813625, whereas for rs2770378 the results indicated a diathesis–stress type of interaction. The findings may be interpreted from the perspective of the social salience hypothesis of oxytocin, with rs4813625 affecting social anxiety levels along a perceived unsafe–safe social context dimension.
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