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Processing Of Social And Monetary Rewards In The Human Striatum
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Processing Of Social And Monetary Rewards In The Human Striatum


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Acquisition of one's own reputation =? Monetary Rewards

Acquisition of one's own reputation =? Monetary Rewards

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  • 1. Processing of Social and Monetary Rewards in the Human Striatum K.Izuma et al. 2008 Neuron Anna Jo March 16th, 2010
  • 2. Acquisition of one’s good reputation =? Monetary Reward Striatum: Reward-related Brain area “Common Neural Currency” 1) Both the anticipation and delivery of the reward (Schultz et al., 2000) 2) Increased activation in response not only to primary rewards such as liquid or food (McClure et al.,2003) and sexual stimuli (Arnow et al., 2002) but also to money, which is a secondary reward (Knutson et al., 2000) 3) To be modulated by the perception of the moral character (or reputation) of others (Delgado et al., 2005) 4) Developing the reputation of other players during an economic game (King-Casas et al., 2005)
  • 3. How the brain processes One’s own positive reputation: Social exchange theory Good Reputation Direct reward Happiness Social Approval => A Hedonic => A Motivational component of component of Anticipated Reward Reward “Liking” “Wanting” reciprocity Monetary Reward Altruism and Expected gain in reputation and perception of influence on efficacy others By Thibaut & Kelley 1959
  • 4. Experiment Paradigm for the Monetary Reward Experiment [ Experimental Design ] 1. Participants: 19 subjects (9 male) 2. Each block consisted of eight trials (24 s) 3. 20 blocks for each of the four conditions [HMR, LMR, NoMR, and fixation rest] 4. A total of four 8 min sessions
  • 5. Experiment Paradigm for the Social Reward Experiment [ Experimental Design ] 1. A self-introduction phase + A social reward acquisition phase. 2. the same 19 subjects were presented with a picture of themselves and a word or phrase indicating the impression of them 3. 84 were selected for the fMRI experiment (42 items each for the HSR and LSR conditions)
  • 6. Behavioral Results Monetary Reward Social Reward • The mean reaction time : • HSR conditions more 1) HMR condition (490 desirable than LSR ms) slower than NoMR conditions condition (448 ms), • Happier in the HSR-Self 2) LMR condition (451 ms) condition than the LSR-Self did not differ significantly condition from the other two • The mean reaction time: conditions. 1) NoSR condition (681 ms: the fastest) / LSR condition (1337 ms: the slowest) 2) Self condition (slower than for the Other condition-HSR)
  • 7. Imaging Results Striatum Thalamus Cerebellum Monetary Reward vs. Social Reward the left caudate nucleus and putamen bilateral caudate bilateral nucleus putamen
  • 8. Discussion 1. Uniquely activated by social rewards 2. Theory of mind (Gallagher and Frith, 2003), self- reflection (Johnson et al., 2002; Kelley et al., 2002), mPFC and reflected self-knowledge (Ochsner et al., 2005) 3. mPFC involvement in self-reflection in the context of attributions made by others
  • 9. Discussion One’s own reputation OFC A good reputation = A primary reward Mid Monetary Striatum Why do people brain Reward sometimes engage in pro-social behaviors while giving up monetary benefits? Insula How and where the negative reward value of a bad reputation is represented remains to be explored.