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Correlation between amygdala volume and impulsivity in adults with attention-deficit hyperactivity disorder
Kazuhiro Tajima-Pozo1, Gonzalo Ruiz-Manrique1, Miguel Yus2
11Department of Psychiatry,Hospital Universitario Fundacion Alcorcon,Madrid,Spain.
Acta Neuropsychiatrica
|May 29, 2015
Summary
Attention-deficit hyperactivity disorder (ADHD) is linked to smaller right amygdala volumes, suggesting impaired emotional control and impulsivity. This finding highlights the amygdala's role in ADHD symptom severity.
Area of Science:
- Neuroscience
- Psychiatry
- Radiology
Background:
- Attention-deficit hyperactivity disorder (ADHD) is a persistent neurobiological disorder.
- Individuals with ADHD often exhibit heightened emotional reactivity.
- The amygdala is crucial for emotional processing and frontal lobe regulation.
Purpose of the Study:
- To investigate the relationship between amygdala volume and impulsivity/emotional instability in adult ADHD patients.
- To test the hypothesis that smaller amygdala volumes correlate with reduced impulse control and emotional dysregulation.
Main Methods:
- Magnetic resonance imaging (MRI) was used to measure amygdala volumes in nine adult ADHD patients and nine healthy controls.
- Manual morphometric measurements of the amygdala were obtained and compared between groups.
Main Results:
- A significant negative correlation was found between right amygdala volume and impulsivity scores (r=-0.756, p=0.018).
- No significant correlation was observed between left amygdala volume and impulsivity.
- Age did not influence the observed results.
Conclusions:
- Smaller amygdala volumes are associated with ADHD.
- Reduced right amygdala volume may contribute to impulsivity and emotional dysregulation in ADHD.
- The right amygdala appears to play a more significant role in behavioral control than the left in ADHD.
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