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Browsing Articles by Author "Lackner, Christine"

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    Does Anxiety Enhance or Hinder Attentional and Impulse Control in Youth With ADHD? An ERP Analysis
    (Sage, 2017) Klymkiw, Deanna F.; Milligan, Karen; Lackner, Christine; Phillips, Marjory; Schmidt, Louis A.; Segalowitz, Sidney J.
    Objective: Youth with ADHD and comorbid anxiety (ADHD+ANX) experience increased social and academic impairment compared with youth with ADHD without anxiety (ADHD). Group differences in attentional and impulse control may underlie this increased impairment. Examination of group differences using behavioral measures of attentional and impulse control has yielded inconsistent findings. This study explored group differences using event-related potentials (ERPs), which provide neural information concerning early information processing. Method: ERPs (early frontal positivity [EFP], N2) were collected while youth aged 11 to 17 with ADHD (n = 31) and ADHD+ANX (n = 35) completed a visual and an auditory computer task. Results: Compared with the ADHD group, the ADHD+ANX group exhibited larger N2 amplitudes to no-go stimuli and larger EFP amplitudes to target auditory stimuli, with variable attention allocation to nontarget stimuli. Conclusion: The addition of anxiety to ADHD appears to alter early attentional processing, which may be an important aspect of this comorbidity.
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    Time Spent in Canada and Ethnic Identity Moderate the Relationship Between Race-Based Traumatic Stress Symptoms and Cognitive and Emotional Processes
    (Healthy Populations Institute, 2024) Bergeron-Germain, Noémie; Hickens, Nicholas; Lackner, Christine
    Introduction: Racial stress is a form of race-based stress triggered by real or perceived discriminatory racial encounters experienced directly or vicariously. Racial stress symptoms resemble post-traumatic stress disorder, which is linked to significant cognitive and emotional disturbances. Objectives: This study investigated the relationship between racial stress symptoms and executive functioning. It explored the moderating effects of potentially protective factors like racial socialization processes, ethnic identity, and proportion of time spent in Canada (PTSC). Methods: Seventy-three participants (M = 29.01 years, SD = 11.10 years; 42 women, 30 men, and one non-binary) were recruited through purposive and convenience sampling and subsequently completed online measures of racial stress, executive functioning (EF), ethnic identity, and racial socialization. Demographic data were also collected. Results: About 20% of participants reported clinically significant symptoms in at least one racial stress domain. Racial stress, executive functioning, and racial socialization were significantly associated. Ethnic identity and racial socialization were significantly associated. Ethnic identity and PTSC moderated the relationship between racial stress and EF in such a way that lower levels of ethnic identity and higher PTSC, respectively, predicted a worse effect of racial stress on two domains of EF. Conclusion: Racialized individuals experience high levels of racial socialization. Although there are differences in those levels across and within minoritized communities, these high levels of racial stress likely lead to executive dysfunction akin to traditional stress. Environmental variables like minority status and high rates of discrimination likely contribute to this association. Specific aspects of the psychological impact of racial discrimination on EF are moderated by PTSC and ethnic identity.