Figure 5.

Single CeA neurons reflect sodium concentration and sodium palatability in distinct response epochs. A, PSTHs for an individual neuron, which produced significant responses (i.e., firing rates that differed from baseline) to 0.01, 0.1, 0.3, and 1.0 m NaCl, for which the overall NaCl response pattern appeared to reflect sodium concentration. B, The magnitudes of correlation between the responses of the neuron in A and sodium concentration (gray line) or sodium palatability (black line). The solid sections of each line mark bins where that correlation achieved significance (p < 0.05). C, PSTHs for an individual neuron, which produced significant responses to 0.01 and 1.0 m NaCl, for which the overall NaCl response pattern appeared to reflect sodium palatability. D, The magnitudes of correlation between the responses of the neuron in C and sodium concentration (gray line) or sodium palatability (black line). The solid sections of each line mark bins where that correlation achieved significance (p < 0.05). E, The mean correlation (±SEM) between neural response and either sodium concentration (gray line) or sodium palatability (black line), averaged across all neurons with significant correlations with concentration or palatability; correlation with concentration significantly rose above zero (p < 0.05; significant bins marked by gray horizontal bar) at 380 ms poststimulus, while correlation with palatability rose at a delay, achieving a significant increase 740 ms poststimulus (p < 0.05; significant bins marked by black horizontal bar). F, the numbers of neurons that produced responses significantly (p < 0.05) correlated with concentration (gray) and palatability (black) in the Middle and Late epochs.