期刊
WORLD JOURNAL OF BIOLOGICAL PSYCHIATRY
卷 21, 期 9, 页码 673-684出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/15622975.2019.1585946
关键词
ADHD; amygdala; delay aversion; functional magnetic resonance imaging; voxel-based morphometry
类别
资金
- Research Foundation - Flanders (FWO) [G.0821.11N]
- KU Leuven Research Fund Grant [OT/12/096]
- FWO [11.ZU.117N]
Objectives: Recent magnetic resonance imaging (MRI) studies implicate structural alterations of amygdala, a brain region responsible for processing and experiencing negative emotions, in adolescents with attention-deficit/hyperactivity disorder (ADHD). Here we examined ADHD-related structural correlates of amygdala functional activity elicited during a functional MRI task designed to test behavioural and brain responses to the imposition of delay - an event known to both elicit amygdala hyperactivation and aversity in ADHD. Methods: Structural MRI scans from 28 right-handed male adolescents with combined type ADHD and 32 age-matched controls were analysed. Regional grey matter volumes of ADHD and control participants (P[FWE] < 0.05) were correlated with delay aversion self-ratings and neural activity in response to delay-related cues on the Escape Delay Incentive fMRI task. Results: ADHD was associated with significantly reduced volumes in bilateral amygdala, parahippocampal and temporal gyrus (P[FWE] < 0.05), greater basolateral amygdala activation to delay-related cues (P[FWE] < 0.05) and higher delay aversion self-ratings. Amygdala volume reductions were significantly correlated with, and statistically mediated the pathway from ADHD to, delay-cue-related amygdala hyperactivity (P < 0.01) and self-reported delay aversion (P < 0.01). Conclusions: We provide the first evidence of the functional significance of reduced amygdala volumes in adolescents with ADHD by highlighting its relation to delay-induced brain activity that is linked to delay aversion.
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