wide range of behavior from arousal, attention and memory to orienting reflex, conditioning and learning, including different binding and information processing mechanisms [31]. Similar, enhanced oscillatory activity at the delta frequency during cognitive tasks may be an indicator of attention and task demand [32], [33]. Recently, it was also found that temporal and spatial phase synchronization of low-frequency oscillations undergoes profound changes from childhood to adulthood and old age, and that stimulus-locked synchronization measures (i.e., PLI and evoked power) of these oscillations are related to independently assessed measures of perceptual speed [30].
