Evoked potential, MUA and theta latency profiles and theta/gamma activity changes after learning. (A) Typical average latency profile for theta, MUA and VEP (P100 and N300) over 40 trials post learning (face-pair shown at time 0). The change in MUA in response to the stimulus is mainly restricted to the 500 ms time window. (B) Mean ± sem % change in theta amplitude (C) Gamma amplitude (D) Theta/gamma ratio (E) Theta gamma coherence and (F) Theta phase tightening (G) Mean ± sem z-scores for theta phase synchronization and (H) Theta phase reset overall and in each of the 3 different animals (A, B and C), and for both the right and left IT, during sessions where discrimination learning performance had yet to reach > 80% (NL = not learned) compared with those where it had (L = learned - corrected t-tests, *p < 0.025 - left IT, and < 0.017 for right IT, **p < 0.01, ***p < 0.001 vs NL and ##p < 0.01, ###p < 0.001 for left IT vs right IT). For overall changes across the sheep p < 0.05, **p < 0.01 and ***p < 0.001 from ANOVA tests. For both NL and L blocks, comparisons were made between data averaged across electrodes and individual trials for the 500 ms immediately prior to stimulus presentation and the first 500 ms during it.
Kendrick et al. BMC Neuroscience 2011 12:55 doi:10.1186/1471-2202-12-55