Background: The present study was designed to examine prefrontal cortical processes in anxious children that mediate cognitive regulation in response to emotion-eliciting stimuli, and the changes that occur after anxious children participate in a cognitive behavioral therapy treatment program.
Methods: Electroencephalographic activity was recorded from clinically anxious children and typically developing children at pre- and post-treatment sessions. Event-related potential components were recorded while children performed a go/no-go task using facial stimuli depicting angry, calm, and happy expressions.
Results: At pre-treatment, anxious children had significantly greater posterior P1 and frontal N2 amplitudes than typically developing children, components associated with attention/arousal and cognitive control, respectively. For the anxious group only, there were no differences in neural activation between face (emotion) types or trial (Go vs. No-go) types. Anxious children who did not improve with treatment showed increased cortical activation within the time window of the P1 at pre-treatment relative to comparison and improver children. From pre- to post-treatment, only anxious children who improved with treatment showed increased cortical activation within the time window of the N2.
Conclusions: At pre-treatment, anxious children appeared to show increased cortical activation regardless of the emotional content of the stimuli. Anxious children also showed greater medial-frontal activity regardless of task demands and response accuracy. These findings suggest indiscriminate cortical processes that may underlie the hypervigilant regulatory style seen in clinically anxious individuals. Neural activation patterns following treatment suggest that heightened perceptual vigilance, as represented by increased P1 amplitudes for non-improvers, may have prevented these anxious children from learning the treatment strategies, leading to poorer outcomes. Increased cognitive control, as represented by increased N2 amplitudes for improvers, may have enabled these anxious children to implement treatment strategies more effectively, leading to improved treatment outcomes. Hence, P1 activation may serve as a predictor of treatment outcome, while N2 activation may serve as an indicator of treatment-related outcome. These findings point to the cortical processes that maintain maladaptive functioning versus the cortical processes that underlie successful intervention in clinically anxious children.
| Identifer | oai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/34061 |
| Date | 13 December 2012 |
| Creators | Hum, Kathryn |
| Contributors | Lewis, Marc D. |
| Source Sets | University of Toronto |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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