Figure 1.

Effect of learning on late-component optimal intensity of occurrence. (A) Comparison of the mean value (±S.E.M.) of the optimal intensity of the late component in the posterior piriform cortex (pPC) before and after learning in the control group (n = 7) and in the trained group (n = 11). Learning induces a significant decrease in optimal intensity mean value in trained animals (asterisk, P = 0.013, Wilcoxon Test). (B) An example of individual evoked field potentials (traces are averages of 12 sweeps) collected in a trained rat in the different sites before (light grey line) and after (dark line) learning for the same intensity of stimulation of the olfactory bulb. Following learning, the late component (LC) was clearly observed in the pPC and the lateral entorhinal cortex, whereas it was absent in the same sites before learning.