The increased beta-band activity for sound-symbolically mismatched sound-shape pairs as compared to sound-symbolically matched pairs may indicate that infants attended to the stimulus pairs more closely when they were sound-symbolically mismatched than matched. We computed PLVz on an individual basis. The statistical group analyses were performed on PLVz time-frequency diagrams by using the same permutation test procedure as for the amplitude change (AMPz) analyses, except that the FDR control find more of multiple comparisons of statistical
effects was made by the number of electrode pairs (i.e., 36 pairs) this time. Fig. 3(d) displays the resulting standardized PLV (PLVz) averaged across all 36 electrode pairs and all infants for the match and mismatch conditions. Prominent large-scale synchronization was observed immediately after the auditory onset (0 msec) across the alpha-beta bands (9–15 Hz) in both conditions. In the match condition, however, active phase synchronization RAD001 concentration was no longer evident from about
300 msec after the auditory onset. In the mismatch condition, in contrast, phase synchrony was stronger and more durable in the later time windows (300 msec onwards) than in the match condition. When comparing the two conditions, a marked difference in large-scale phase synchronization was found in the beta band (12–15 Hz), which is in accordance with previous findings reporting the involvement of beta-band amplitude increase and coherence Histone demethylase in multi-sensory integration ( Senkowski et al., 2008). Fig. 3(c) presents a topographical map showing significant PLVz difference between the two conditions lasting more than .96 frequency cycles in each time window. The .96 frequency cycle criterion was chosen in such a way that a type I error was not found in the baseline time window, where no difference between the match and mismatch conditions should be observed. A statistically significant difference was found between the match and mismatch
conditions in the latter two time windows (301–600 msec, 601–900 msec). In these time windows, phase synchronization increased for sound-symbolically mismatched sound-shape pairs than for sound-symbolically matched pairs in the beta band (14–15 Hz), most prominently between electrode P3 (and C3) and other electrodes over the left scalp. The N400 time-window coincided with the time period in which the most prominent difference in synchronization between matching and mismatching conditions was found. See Supplementary Fig. S1 for a topographical map showing significant PLVz for the match and mismatch conditions as compared to pre-stimulus baseline. Spurious phase synchrony of EEG signals could arise from volume conduction due to a single dipole activity.
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