Table 1.
AEP | TFA | NIRS | |||||
---|---|---|---|---|---|---|---|
Mean amplitude | Peak amplitude | Desynchronization (4–8 Hz) | Activation (oxy and/or deoxy) | ||||
N1 | P2 | N1 | P2 | ||||
6 mo | Fast | + | = | + | − | − | LH > RH (3) |
RH > LH (6) | |||||||
Slow | − | = | − | + | + | RH > LH (1, 6) | |
3 mo | Fast | + | = | + | − | − | LH > RH (2, 3, 5) |
Slow | − | = | − | + | − | LH > RH (2, 5) |
Displays the comparison of fast and slow acoustic modulations for the two age groups separately. 6 mo, 6 month old infants; 3 mo, 3 month old infants; AEP, auditory-evoked potential, TFA, time-frequency analysis; NIRS, near-infrared spectroscopy; N1, first negativity; P2, second positivity; LH, left hemisphere; RH, right hemisphere; (+), increase; (−), decrease; (=), no difference. Location of the areas measured by means of NIRS are described by the number in brackets (please also refer to Figure 1): (1) inferior frontal, (2) superior frontal, (3) inferior temporal, (4) superior temporal, (5) posterior temporal, and (6) temporo-parietal.