303 μV). As for lateral electrode locations, the factor repetition as well as the repetition × side interaction only approached significance: F1,14 = 4.187 and 3.811, P = 0.060 and 0.071, respectively. Additionally, the omnibus anova showed a main effect of laterality: F1,14 = 29.819, P < 0.001, partial η2 = 0.681. Larger negative values were found at central (mean = −1.577 μV, SE = 0.260 μV) rather than at lateral electrode locations (mean = −1.092 μV, SE = 0.219 μV). Figure 3A and B displays nose-referenced

SP maps to evidence polarity inversion below the Sylvian fissure. At visual inspection, SCD maps display two main source–sink learn more configurations, one in each hemisphere, with current sources below the Sylvian fissure and current sinks at frontocentral leads (Fig. 3A). The omnibus anova Selleck Everolimus (Table 2) showed a significant repetition × repetition probability interaction within isochronous sequences: F1,14 = 5.477, P = 0.035, partial η2 = 0.281. A significant difference between first deviant tones and highly probable deviant repetitions was documented using t-tests: t14 = −2.365, P = 0.033. The response to highly probable deviant repetitions (mean = −0.099 mA/m3, SE = 0.101 mA/m3) was attenuated compared with first deviant tone response (mean = −0.045 mA/m3, SE = 0.085 mA/m3). No significant difference was found between first deviant tone and less probable deviant

tone repetitions: t14 = −1.227, P = 0.240. This suggests a marked attenuation of the frontocentral sinks underlying predictable repeated deviant MMN

responses. Additionally, a main effect of side was found: F1,14 = 7.264, P = 0.017, partial η2 = 0.342. Larger current density values were found over the right hemisphere (mean = −0.078 mA/m3, SE = 0.019 mA/m3) than over the left hemisphere (mean = −0.040 mA/m3, SE = 0.013 mA/m3). SPMs of the MMN component generator locations were computed for repeated deviant responses in all conditions (Fig. 4). Activation maxima were found in the left superior temporal gyrus (STG). Highly probable deviant repetitions in isochronous sequences activated the STG, bilaterally, frontally extending to the insula, precentral gyrus, inferior frontal gyrus, right lateral orbitofrontal gyrus and Chorioepithelioma to the middle temporal gyrus (MTG). Less probable deviant repetitions in isochronous sequences showed bilateral activations within the STG and MTG, extending posteriorly to the left postcentral and supramarginal gyri. Highly probable deviant repetitions in anisochronous sequences activated the left STG, left postcentral and supramarginal gyri, but also the superior frontal and middle frontal gyri. Finally, less probable deviant repetitions in anisochronous sequences activated the STG, bilaterally, the supramarginal gyri and MTG. Figure 5 shows the SPMs for the deviant repetition probability contrasts (high vs. low) highlighting the regions of response attenuation to predictable deviant repetitions in both temporal regularity conditions.