1. ACC encodes expected reward size, but not delay (n = 38)
ACC encodes expected reward size, but not delay (n = 38). a, Curves representing population firing (aligned on odor onset) for expected big reward (thick black), small reward (thick gray), short delay (thin black), and long delay (dashed gray).
ACC encodes expected reward size, but not delay (n = 38). a, Curves representing population firing (aligned on odor onset) for expected big reward (thick black), small reward (thick gray), short delay (thin black), and long delay (dashed gray). The first 10 trials of each block were excluded from this analysis so that activity could be examined after learning. Note that reward delivery occurs ∼1.5 s after odor onset for short-, big-, and small-reward trials. Reward on long-delay trials occurs ∼1.5–8.5 s after odor onset, thus comparisons between long-delay trials and the other three trial types should not be made later during the trial. b, c, Distributions reflecting the difference in neural activity (100 ms after odor onset to well entry) between short and long [(short − long)/(short + long)] and big and small [(big − small)/(big + small)], respectively. Black bars represent the number of neurons that showed a significant difference between these responses (t test, p < 0.05). N = 4 rats.
Daniel W. Bryden et al. J. Neurosci. 2011;31:
©2011 by Society for Neuroscience