Abstract
Rationale
Dopamine (DA) in the ventral striatum (VST) has long been implicated in addiction pathologies, yet its role in temporal decision-making is not well-understood.
Objectives
To determine if VST DA D2 receptor availability corresponds with greater impulsive choice in both nontreatment-seeking alcoholics (NTS) and social drinkers (SD).
Methods
NTS subjects (n = 10) and SD (n = 13) received PET scans at baseline with the D2/D3 radioligand [11C]raclopride (RAC). Outside the scanner, subjects performed a delay discounting procedure with monetary rewards. RAC binding potential (BPND) was estimated voxelwise, and correlations were performed to test for relationships between VST BPND and delay discounting performance. Self-reported impulsivity was also tested for correlations with BPND.
Results
Across all subjects, greater impulsive choice for $20 correlated with lower BPND in the right VST. NTS showed greater impulsive choice than SD and were more impulsive by self-report. Across all subjects, the capacity of larger rewards to reduce impulsive choice (the magnitude effect) correlated negatively (p = 0.028) with problematic alcohol use (AUDIT) scores. Self-reported impulsivity did not correlate with BPND in VST.
Conclusions
Preference for immediate reinforcement may reflect greater endogenous striatal DA or lower D2 number, or both. Alcoholic status did not mediate significant effects on VST BPND, suggesting minimal effects from alcohol exposure. The apparent lack of BPND correlation with self-reported impulsivity highlights the need for objective behavioral assays in the study of the neurochemical substrates of behavior. Finally, our results suggest that the magnitude effect may be more sensitive to alcohol-induced problems than single discounting measures.
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Notes
Amphetamine’s ability to reduce impulsive choice in animal studies is known to be sensitive to the presence of a cue bridging the delay (Cardinal et al. 2000), order of delay presentation (Tanno et al. 2014), as well as sex, strain, and baseline impulsivity differences (Eubig et al. 2014; Huskinson et al. 2012; Krebs and Anderson 2012). Some discrepancies in this literature are likely due to these varied factors across studies.
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Acknowledgments
We gratefully acknowledge Kevin Perry, Wendy Territo, Michele Beal, Courtney Robbins (Department of Radiology and Imaging Sciences) for technical and regulatory assistance, as well as Dr. Jaroslaw Harezlak for statistical consultation. We also thank Dr. Mark Green, Dr. Qi-Huang Zheng, Barbara Glick-Wilson, and Brandon Steele for radiochemical synthesis of [11C]raclopride. This study is supported by R01 AA018354 to KKY, T32 AA007462 to BGO, and R01 AA017661 to DAK; additionally supported by the Indiana Clinical and Translational Sciences Institute Clinical Research Center, UL1TR001108, NIH, National Center for Advancing Translational Sciences, Clinical and Translational Sciences Award.
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The authors declare no conflict of interest. Authors maintain full control of all primary data and agree to review by journal upon request.
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Oberlin, B.G., Albrecht, D.S., Herring, C.M. et al. Monetary discounting and ventral striatal dopamine receptor availability in nontreatment-seeking alcoholics and social drinkers. Psychopharmacology 232, 2207–2216 (2015). https://doi.org/10.1007/s00213-014-3850-5
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DOI: https://doi.org/10.1007/s00213-014-3850-5