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Genetic Variation in Dopaminergic Neuromodulation Influences the Ability to Rapidly and Flexibly Adapt Decisions

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Genetic Variation in Dopaminergic Neuromodulation Influences the Ability to Rapidly and Flexibly Adapt Decisions Genetic variation in dopaminergic neuromodulation influences the ability to rapidly and flexibly adapt decisions Lea K. Krugela,b,c,1, Guido Bielea,b,c, Peter N. C. Mohra,b,c, Shu-Chen Lia,c, and Hauke R. Heekerena,b,c,1 aNeurocognition of Decision Making, Max Planck Institute for Human Development, Lentzeallee 94, 14195 Berlin, Germany; bMax Planck Institute for Human Cognitive and Brain Sciences, Stephanstrasse 1a, 04103 Leipzig, Germany; and cNeuroscience Research Center and Berlin NeuroImaging Center, Charite´University Medicine Berlin, Schumannstrasse 20/21, 10117 Berlin, Germany Edited by Leslie G. Ungerleider, National Institutes of Health, Bethesda, MD, and approved September 3, 2009 (received for review May 11, 2009) The ability to rapidly and flexibly adapt decisions to available phylogenetically ancestral allele (Val homozygotes). Therefore, rewards is crucial for survival in dynamic environments. Reward- Met homozygotes have higher levels of DA in the PFC, where the based decisions are guided by reward expectations that are up- influence of COMT on DA degradation is largest (11). Whereas dated based on prediction errors, and processing of these errors most prior studies focused on the direct effects of the Val158Met involves dopaminergic neuromodulation in the striatum. To test polymorphism in the PFC and emphasized a behavioral advantage the hypothesis that the COMT gene Val158Met polymorphism leads for the phylogenetically emerging Met genotype in executive cog- to interindividual differences in reward-based learning, we used nitive tasks (8–10) (but see ref. 12), two recent studies provided the neuromodulatory role of dopamine in signaling prediction evidence for an influence of the COMT genotype on subcortical errors. We show a behavioral advantage for the phylogenetically regions in gambling paradigms (13, 14). ancestral Val/Val genotype in an instrumental reversal learning Animal studies have shown that DA flux in the PFC indirectly task that requires rapid and flexible adaptation of decisions to affects downstream dopaminergic targets, particularly the striatum changing reward contingencies in a dynamic environment. Imple- (15, 16) where DA activity is—unlike in the PFC—predominantly menting a reinforcement learning model with a dynamic learning regulated by DA reuptake through presynaptic DA transporters NEUROSCIENCE rate to estimate prediction error and learning rate for each trial, we (17, 18). Specifically, these studies indicate an inverse relationship discovered that a higher and more flexible learning rate underlies between extrasynaptic DA levels in the PFC and synaptic DA the advantage of the Val/Val genotype. Model-based fMRI analysis activity in the striatum by means of an indirect subcortical effect. revealed that greater and more differentiated striatal fMRI re- Whereas projections from the PFC to the midbrain directly contact sponses to prediction errors reflect this advantage on the neuro- dopaminergic cell groups that project back to the PFC to generate biological level. Learning rate-dependent changes in effective a positive feedback loop, they indirectly (via inhibiting intermedi- connectivity between the striatum and prefrontal cortex were ates) regulate dopaminergic cell groups that project to the striatum greater in the Val/Val than Met/Met genotype, suggesting that the (15, 16). These previous findings raise the possibility that the COMT advantage results from a downstream effect of the prefrontal Val158Met polymorphism also has an indirect opposite effect on cortex that is presumably mediated by differences in dopamine striatal DA activity. Several animal studies found evidence for a metabolism. These results show a critical role of dopamine in reciprocal relationship between cortical and subcortical DA sys- processing the weight a particular prediction error has on the tems (19–21), whereas a study on COMT knockout mice did not expectation updating for the next decision, thereby providing important insights into neurobiological mechanisms underlying find a striatal effect on basal concentrations of DA (22). Impor- the ability to rapidly and flexibly adapt decisions to changing tantly, a postmortem study in humans revealed higher DA synthesis reward contingencies. rates in projections from the midbrain to the striatum of Val homozygotes (23). Furthermore, multimodal neuroimaging in hu- COMT ͉ dopamine ͉ functional MRI ͉ learning rate ͉ mans showed greater DA synthesis in the dopaminergic midbrain reinforcement learning in Val carriers than Met homozygotes (24). Although this was found for dopaminergic midbrain neurons in general (i.e., not specifically for those midbrain neurons that project to the striatum), an overall uman learning spans a wide range of functions from ancient higher DA synthesis in Val carriers is likely to translate into a evolutionary accomplishments [e.g., fast and intuitive learning H greater DA supply in the striatum [as opposed to the PFC (11)], from rewards (1, 2)], to complex executive processes that require where COMT expression is sparse. The greater supply of striatal high capacities of attention and working memory (3, 4). These DA in Val homozygotes has been hypothesized to result in greater functions are supported by interacting brain regions that comprise striatal DA burst firing (phasic activity) and a subsequent advantage phylogenetically ancient structures (e.g., the striatum) as well as more recently evolved neocortical structures [e.g., the prefrontal for Val homozygotes in tasks that demand flexibility (25); this cortex (PFC)]. Still, different learning processes rely on the same contrasts with the better stabilization effects through higher levels neuromodulators. Dopamine (DA) modulates synaptic efficacy in of prefrontal DA (26) in Met homozygotes (8–10). both the striatum and PFC (5) and is thus involved in different kinds of learning. Accordingly, interindividual differences in dopaminer- Author contributions: L.K.K., G.B., and H.R.H. designed research; L.K.K., G.B., and P.N.C.M. gic neuromodulatory mechanisms contribute to performance dif- performed research; L.K.K. and G.B. analyzed data; and L.K.K., G.B., P.N.C.M., S.-C.L., and ferences in both simple instrumental learning tasks and complex H.R.H. wrote the paper. cognitive tasks (6–10). The authors declare no conflict of interest. One interindividual difference in dopaminergic neuromodula- This article is a PNAS Direct Submission. tion that has been linked to PFC function is the uniquely human Freely available online through the PNAS open access option. 158 Val Met polymorphism in the enzyme catechol-O-methyltrans- 1To whom correspondence may be addressed. E-mail: [email protected] or ferase (COMT), which regulates extrasynaptical DA degradation [email protected]. (8–10). COMT activity is lower in individuals homozygous for the This article contains supporting information online at www.pnas.org/cgi/content/full/ mutated allele (Met homozygotes) than in homozygotes of the 0905191106/DCSupplemental. www.pnas.org͞cgi͞doi͞10.1073͞pnas.0905191106 PNAS ͉ October 20, 2009 ͉ vol. 106 ͉ no. 42 ͉ 17951–17956 Downloaded by guest on September 25, 2021 Fig. 1. Experimental design and behav- ioral results. (A) Participants repeatedly chose one of four cues associated with different positive amounts of points. The probability of yielding the highest possi- ble outcome was 80% for the best option and 20% for the other options. After par- ticipants made a choice for one cue, the chosen option was highlighted and fol- lowed by an outcome display. Failure to make a choice led to 0 points. Points were converted into money after the experi- ment. Choice options were represented by four easily memorable symbols that stayed at the same screen location throughout the whole experiment. (B) Val homozygotes collected more points than Met homozygotes (P ϭ 0.038). (C) Dy- namic learning rate of Val and Met ho- mozygotes before and after reversal (in- dicated by vertical line). We hypothesized that the phylogenetically ancestral Val geno- points as possible by adapting their choices to ongoing changes in type, which constitutes the most frequent COMT genotype world- reward contingencies (Fig. 1A). In line with our prediction, Val wide (27), is associated with an advantage in rapid and flexible homozygotes won significantly more points than Met homozygotes learning from rewards through greater striatal burst firing of DA (P ϭ 0.038, see Fig. 1B). Val homozygotes also reached the hidden neurons. Phasic DA activity plays a prominent role in the reward- criterion for a reversal more often. Neither Val homozygotes nor based learning that underlies the ability to adapt decisions to Met homozygotes became aware of the underlying pattern in the available outcomes (1, 2). Specifically, neurophysiological studies reward schedule described in Methods, indicating that the task relies revealed that phasic DA activity signals the discrepancy between on implicit learning. The behavioral advantage of Val homozygotes reward prediction and reward occurrence [prediction error (PE)], is unlikely to be caused by other single-nucleotide polymorphisms which is used as a teaching signal in the learning process to update or differences in cognitive function, as we controlled for genetic the expectation about the next outcome (1, 2). A number of differences in a wide range of other genetic polymorphisms as well functional magnetic resonance imaging (fMRI) studies showed that as for differences in a large battery of psychometric
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