استفاده از مواد مخدر والدین و عملکرد سیستم های انگیزه و بازداری رفتاری در جوانان به مواد مخدر ساده
|کد مقاله||سال انتشار||تعداد صفحات مقاله انگلیسی||ترجمه فارسی|
|50953||2012||8 صفحه PDF||سفارش دهید|
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Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Psychiatry Research: Neuroimaging, Volume 201, Issue 2, 28 February 2012, Pages 128–135
It is hypothesized that the development of substance abuse (SA) may be due to imbalance in functions of the motivation-reward and behavioral inhibition systems in the brain. This speaks to the search for biological risk factors for SA in drug-naïve children who also exhibit motivational and inhibitory control deficits; however, this type of research is currently lacking. The objective of this study was to establish a neurobiological basis for addiction vulnerability using functional magnetic resonance imaging (fMRI) in drug-naïve youth with attention deficit/hyperactivity disorder (ADHD). We hypothesized that children with ADHD alone would show higher activity in regions of the motivation-reward and behavioral inhibition systems than children with ADHD and a parental history of SA. Toward this goal we scanned 20 drug-naïve children with ADHD ages 8–13 while performing an event-related reward task. High (N = 10) and low (N = 10) risk subjects were identified, based on parental history of SA. The effects of anticipation, conflict, and reward were assessed with appropriate linear contrasts, and between-group differences were assessed using statistical parametric mapping. The two groups did not differ on behavioral measures of the task. The fMRI results show heightened activation in the brain motivational-reward system and reduced activation of the inhibitory control system in high-risk compared to low-risk children. These results suggest that a functional mismatch between these two systems may represent one possible biological underpinning of SA risk, which is conferred by a parental history of addiction.