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Modest correlations between p1 and itc at frontal

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modest correlations between P1 and ITC at frontal electrodes is seen in 9-year-olds,which disappears completely for 11-year-olds. ESRP shows a complementary pattern,9
with few significant relationships to P1 amplitude for younger children, except atelectrode T7, but significant correlations for ERSP at frontal electrodes and C3.It isworth noting that P1 is much smaller in 11-year-olds than 7-year-olds (see SupplementalMaterial, Appendix 1).For Ta/N1b note that the polarity of the peak is opposite for the fronto-central electrodesand the temporal electrodes.Given the latency of Ta at 100-150 ms, we would expect tosee strongest correlations with the theta and alpha frequency ranges. The youngestchildren, 7-year-olds, show a strong correlation between amplitude of Ta/N1b and ITC atall electrodes except PZ, which is most marked at the lowest frequencies. In contrast,only two correlations with ERSP exceed .3 at this age. These correlations with ITCdecline and become less consistent for the two groups of 9-year-olds, though are stillevident at some frontal electrodes at lower frequencies, and for electrode T8. Correlationswith ERSP are mostly non-significant and not consistent across the two groups of 9-year-olds.For 11-year-olds, there is again a pattern of significant correlations between Ta/N1bamplitude and ITC at lower frequencies, but this is now apparent for CZ, C4 and Pz, andnot for frontal or temporal electrodes.Again, there is some indication of a relationshipwith ERSP at higher frequencies at frontal sites. Once again, note that the size of Ta/N1bis considerably smaller in 11-year-olds than the other groups.Overall, the pattern of results is consistent with the view that synchronisation ofoscillations plays a role in determining the amplitude of both P1 and Ta/N1b in youngerchildren, for whom these peaks are most evident.Source localisationFigure 4, panel A, shows the scalp distribution for two independent components(IC1 andIC 2) identified for each grand average (age group x session), together with the locationof the right-sided dipole for each component. It is evident from inspection that thecomponents are very similar at all ages, with the first one indexing activity recorded fromfrontocentral channels, and the second indexing activity from temporal electrode sites,with reversal of polarity at central and centro-posterior electrode sites. The dipolelocations were closely similar for all four groups, with component 1 being tangential andcomponent 2 radial. Figure 4, panel B, shows the dipole locations in more detail (basedon grand means collapsed across all participants), superimposed on a standard MNItemplate. Both dipoles are located on the superior surface of the temporal lobe. Dipole 1is located antero-lateral to dipole 2. According to the Jülich Histological Atlas, bothdipoles fall within the standard space probabilistic maps for primary auditory cortexbased on cytoarchitecture .

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Term
Winter
Professor
monica sanchez
Tags
temporal lobe, Evoked potential, Electroencephalography, primary auditory cortex, superior temporal gyrus

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