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It is generally believed that when making economic choices,we first assign values to available options then compare them to generate a decision.The lateral intraparietal area(LIP)has been considered a candiate neural substrate where action values associated with saccade are represented and compared.This proposal is largely based on the finding that in monkeys making value-based decisions,activity of an LIP neuron correlates with the reward expected from saccade into the neurons response field..