Scott R. Miller

Knowing when not to use the Internet: Shyness and adolescents' on-line and off-line interactions with friends

The goal of the study was to explore the content of on-line and off-line peer interactions among shy and non-shy adolescents. Participants were 148 ten-to-eighteen year old adolescents in Rome, Italy (n=98) and Ottawa, Canada (n=50). Participants completed self reports of shyness and loneliness and web logs of their interactions with friends both in person and on-line. Among the results, there was little general difference in the general content and emotion expressed during the two modalities of interaction with friends, both of which were used in a wide variety of ways. Importantly, shy participants used the on-line modality more extensively than their non-shy counterparts to express negative emotions and to convey content regarding negative exchanges with peers. Such use of electronic communication may be an important contributor to their loneliness.

Planum temporale morphology in children with developmental dyslexia.

The planum temporale is a highly lateralized cortical region, located within Wernickes area, which is thought to be involved in auditory processing, phonological processing, and language. Research has linked abnormal morphology of the planum temporale to developmental dyslexia, although results have varied in large part due to methodological inconsistencies in the literature. This study examined the asymmetry of the planum temporale in 29 children who met criteria for dyslexia and 26 children whose reading was unimpaired. Leftward asymmetry of the planum temporale was found in the total sample and this leftward asymmetry was significantly reduced in children with dyslexia. This reduced leftward asymmetry in children with dyslexia was due to a planum temporale that is larger in the right hemisphere. This study lends support to the idea that planum temporale asymmetry is altered in children with developmental dyslexia.

The interaction of psychosocial adversity and biological risk in childhood aggression

Childhood aggression has both biological and environmental underpinnings. However, the manner in which these factors interact to influence various types of aggression remains an important area of study. The current study examined the degree to which biological risk and psychosocial adversity, both alone and in combination, are associated with childhood aggression. Linear regression procedures were used to assess the extent to which biological risk status (low vs. high serotonergic responsivity, as measured by prolactin response to fenfluramine), magnitude of psychosocial risk, and the interaction of these factors predicted parent and teacher ratings of aggression and delinquency. After accounting for the independent contribution of biological and psychosocial risk, the interaction of biological and psychosocial risk was significantly associated with parent-rated aggression and marginally related to parent-rated delinquency. In contrast, no such interaction was observed for teacher-rated aggression. Findings suggest that individuals at biological risk for aggression may be particularly vulnerable to the impact of psychosocial adversity.

Social support for African American low-income parents: The influence of preadolescents' risk behavior and support role on parental monitoring and child outcomes

Summary Urban parents, particularly single mothers living within inner-city communities, often struggle to obtain sufficient social support for themselves and for parenting. Support for these parents is particularly important given the prevalence of risk-taking behaviors among youth in these communities, which necessitates vigilant monitoring of these youth. The current study explored from whom low-income mothers obtain social support, the influence of child externalizing on source of social support, and how social support and child behavior interrelate with parental monitoring and supervision. Contrary to expectations, parental monitoring at time 1 did not predict child externalizing at time 2, but, as expected, a significant negative association was noted at time 1 between these constructs. Higher time 1 child externalizing did predict lower time 2 maternal monitoring, suggesting frustrated efforts by mothers to monitor high externalizing children. Mothers reporting strong support networks, however, showed higher levels of monitoring, and mothers who turned to children for social support also showed a tendency to monitor more closely. Although mothers of high externalizing children reported poor support quality, mothers did not discriminate between high and low externalizing children when choosing source of social support. These findings suggest the importance of monitoring prior to child initiation into risk-taking behavior, and the possible role of children in strengthening support networks.

Are Cognitive Control and Stimulus-Driven Processes Differentially Linked to Inattention and Hyperactivity in Preschoolers?

Temperament and attention-deficit/hyperactivity disorder (ADHD) are both typically viewed as biologically based behavioural constructs. There is substantial overlap between ADHD symptoms and specific temperamental traits, such as effortful control, especially in young children. Recent work by Martel and colleagues (2009, 2011) suggests that cognitive control temperamental processes are more closely related to inattention symptoms, whereas stimulus-driven temperamental processes are linked to hyperactivity-impulsivity. The present study tested a model of temperament and ADHD symptoms in typically developing preschoolers and those at risk for ADHD using structural equation modelling. Data were from larger study on ADHD in a short-term longitudinal sample with parent/teacher reports and neurocognitive testing. Participants included 214 preschool children (72.9% male) from diverse ethnic/racial backgrounds and a wide range of socioeconomic status from a large metropolitan center. Cognitive control processes, such as effortful control, but not stimulus-driven processes, are related to inattention and hyperactivity. In contrast, stimulus-driven processes, such as emotional reactivity, were related only to hyperactivity symptoms longitudinally. These results suggest that early temperament behaviours and cognitive processes may be indicators of later childhood behavioural difficulties with lasting consequences.