title: Neurobiological underpinnings of sensation seeking trait in heroin abusers.
abstract: Neurobiological investigation of heroin revealed that abusers of this highly addictive substance show dysregulation in brain circuits for reward processing and cognitive control. Psychologically, personality traits related to reward processing and cognitive control differed between heroin abusers and non-abusers. Yet, there is no direct evidence on the relationship between these neurobiological and psychological findings on heroin abusers, and whether such relationship is altered in these abusers. The present study filled this research gap by integrating findings obtained via magnetic resonance imaging (structural volume and resting-state functional connectivity) and self-reported personality trait measures (Zuckerman׳s Sensation Seeking Scale and Barratt Impulsivity Scale) on 33 abstinent heroin users and 30 matched healthy controls. The key finding is a negative relationship between high sensation seeking tendency and midbrain structural volume in the heroin users. Importantly, there was stronger coupling between the midbrain and ventromedial prefrontal cortex and weaker coupling between the midbrain and dorsolateral prefrontal cortex in heroin users. Our findings offer significant insight into the neural underpinning of sensation seeking in heroin users. Importantly, the data shed light on a novel relationship between the mesolimbic-prefrontal pathway of the reward system and the high sensation seeking personality trait in heroin abusers.
authors.affiliation: Laboratory of Neuropsychology, The University of Hong Kong, Hong Kong; Laboratory of Cognitive Affective Neuroscience, The University of Hong Kong, Hong Kong; Institute of Clinical Neuropsychology, The University of Hong Kong, Hong Kong.
authors.forename: Gordon L F
authors.initials: GL
authors.lastname: Cheng
authors.affiliation: Guangdong Provincial Hospital of Chinese Medicine, China.
authors.forename: Yu-Pin
authors.initials: YP
authors.lastname: Liu
authors.affiliation: Applied Cognitive Neuroscience Laboratory, The Hong Kong Polytechnic University, Hong Kong.
authors.forename: Chetwyn C H
authors.initials: CC
authors.lastname: Chan
authors.affiliation: The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong; Department of Anatomy, The University of Hong Kong, Hong Kong; GHM Institute of CNS Regeneration, Jinan University, Guangzhou, China.
authors.forename: Kwok-Fai
authors.initials: KF
authors.lastname: So
authors.affiliation: The Research Center of Psychology and Brain Science, Guangzhou University, China; The School of Medicine, Jinan University, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Zeng
authors.affiliation: Laboratory of Neuropsychology, The University of Hong Kong, Hong Kong; Laboratory of Cognitive Affective Neuroscience, The University of Hong Kong, Hong Kong; Institute of Clinical Neuropsychology, The University of Hong Kong, Hong Kong; The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong. Electronic address: tmclee@hku.hk.
authors.forename: Tatia M C
authors.initials: TM
authors.lastname: Lee
mesh_terms: D000328:Adult; D000428:Alcohol Drinking / Q000473:pathology / Q000503:physiopathology; D001921:Brain / Q000473:pathology / Q000503:physiopathology*; D001931:Brain Mapping; D006556:Heroin Dependence / Q000473:pathology / Q000503:physiopathology* / Q000523:psychology*; D006801:Humans; D007175:Impulsive Behavior; D008279:Magnetic Resonance Imaging; D008297:Male; D009483:Neuropsychological Tests; D009929:Organ Size; D010551:Personality / Q000502:physiology*; D010556:Personality Tests; D012146:Rest; D012201:Reward; D012907:Smoking / Q000473:pathology / Q000503:physiopathology
keywords: Addiction; Midbrain; Personality trait; Prefrontal cortex; Reward system; Substance abuse