The choice behavior of the monkey
tracks changes in the Nash equilibrium prediction in
response to changes in the outcome payoffs. However,
neuron (LIP) firing in the parietal cortex does not track
the changing equilibrium values, but remains steady
at the relative (unchanging) realized expected payoffs
such that the decision-maker is indifferent between
the options available – i.e., the expected payoffs are
the same in the comparison. These results are consistent
with the hypothesis that the brain computes and
maintains equilibrium while behavior responds to
changes in the payoffs