katherine_slides

katherine_slides - Does the brain compute confidence...

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Does the brain compute confidence estimates about decisions?
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EXPERIMENT SETTING AND BEHAVIORAL DATA -Two choice odor mixture categorization - Randomized delays: between entering the odor port and odor delivery; and between entering the choice port and reward delivery (for correct choices) - Reward contingencies deterministic -Decision uncertainty varies with stimulus difficulty due to imperfect perception of stimuli and knowledge of category boundary
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NEURAL DATA - Single neuron activity in the orbitofrontal cortex (OFC) was recorded during the delay period between choice and reward - Firing rates of many OFC neurons during this period were modulated by stimulus difficulty: A large fraction of OFC neurons fired more intensely for more difficult stimuli; smaller fraction showed opposite tuning. This is consistent with previous findings that OFC neurons activity correlates with the expected values of reward.
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MORE NEURAL DATA Is the firing rate modulated by anything else except stimulus difficulty? Many neurons show different firing rates for correct and error choices, and this difference is observed before the outcome delivery: Again, a large fraction of neurons fired more for incorrect trials; smaller fraction had opposite tuning. Notice that the difference in firing rates is larger for easier stimuli which paradoxical if the firing rate is driven by stimulus difficulty!
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SUMMARIZING THE NEURAL DATA Explanation?
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DYNAMIC LEARNING ? Maybe reward predictions are based on recent reinforcement history?
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katherine_slides - Does the brain compute confidence...

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