OBJECTIVES: Adults with bipolar disorder (BD) display aberrant activation in fronto-limbic neural circuitry during cognitive control. However, fronto-limbic response to cognitive control, and factors destabilizing this circuitry, remain under-studied during the transition from adolescence to young adulthood in BD. Sleep patterns are disturbed in BD, undergo change in adolescence, and support brain function. Among transitional age youth, BD diagnosis and sleep (duration and variability) were tested as predictors of fronto-limbic response to a stressful cognitive control task. METHODS: Two groups of youth (13-22 years old) participated: 15 with BD type I, II or not otherwise specified (NOS) [BD; age 18.1 ± 2.7 years (mean ± standard deviation, SD); 17 female] and 25 healthy controls [CTL; age 19.4 ± 2.7 years (mean ± SD); 17 female]. Sleep was monitored with actigraphy for at least 1 week prior to an adaptive multi-source interference functional magnetic resonance imaging (fMRI) paradigm (a Stroop-like cognitive interference task). Group status and sleep duration (average and intra-individual variability) were examined as predictors of activation in response to incongruent>congruent trials within the bilateral amygdala, anterior cingulate (ACC), ventrolateral prefrontal and dorsolateral prefrontal cortical regions of interest. RESULTS: The BD group displayed greater right amygdala activation than the CTL group. Average sleep duration and rostroventral ACC (rvACC) activity were negatively associated in the CTL group, but exhibited a quadratic relationship in the BD group such that short and long sleep were related to greater rvACC activation. Sleep duration variability and dorsal ACC activity were negatively associated in the BD group, and unrelated in the CTL group. Findings remained significant after controlling for age, sex, and mood symptoms. CONCLUSIONS: Subjects with BD displayed a hyper-limbic response during cognitive control, and sleep was a source of variability in ACC engagement. Stabilizing sleep may be one avenue for improving cognitive control in BD.
OBJECTIVES: Adults with bipolar disorder (BD) display aberrant activation in fronto-limbic neural circuitry during cognitive control. However, fronto-limbic response to cognitive control, and factors destabilizing this circuitry, remain under-studied during the transition from adolescence to young adulthood in BD. Sleep patterns are disturbed in BD, undergo change in adolescence, and support brain function. Among transitional age youth, BD diagnosis and sleep (duration and variability) were tested as predictors of fronto-limbic response to a stressful cognitive control task. METHODS: Two groups of youth (13-22 years old) participated: 15 with BD type I, II or not otherwise specified (NOS) [BD; age 18.1 ± 2.7 years (mean ± standard deviation, SD); 17 female] and 25 healthy controls [CTL; age 19.4 ± 2.7 years (mean ± SD); 17 female]. Sleep was monitored with actigraphy for at least 1 week prior to an adaptive multi-source interference functional magnetic resonance imaging (fMRI) paradigm (a Stroop-like cognitive interference task). Group status and sleep duration (average and intra-individual variability) were examined as predictors of activation in response to incongruent>congruent trials within the bilateral amygdala, anterior cingulate (ACC), ventrolateral prefrontal and dorsolateral prefrontal cortical regions of interest. RESULTS: The BD group displayed greater right amygdala activation than the CTL group. Average sleep duration and rostroventral ACC (rvACC) activity were negatively associated in the CTL group, but exhibited a quadratic relationship in the BD group such that short and long sleep were related to greater rvACC activation. Sleep duration variability and dorsal ACC activity were negatively associated in the BD group, and unrelated in the CTL group. Findings remained significant after controlling for age, sex, and mood symptoms. CONCLUSIONS: Subjects with BD displayed a hyper-limbic response during cognitive control, and sleep was a source of variability in ACC engagement. Stabilizing sleep may be one avenue for improving cognitive control in BD.
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