Low-frequency oscillations (< 10 Hz) in EEG (O2 electrode) and in the cochlea (DPOAE) during selective visual attention.

All graphs represent grand average data. Left column shows (a) a visual evoked potential recorded from the right occipital cortex (mean latency: 340 ± 7 ms), (c) time spectrum and (e) increased phase locking values of these brain oscillations. Right column shows (b) a lack of evoked effects in DPOAE amplitudes, while (d) low frequency induced oscillations can be observed between 1 and 7 Hz. (f) Notice the presence of a small region of phase lock value increase at around -1200 ms, while in the rest of the graph there is no phase locking in cochlear oscillations. Shaded green areas in (a) and (b) represent data dispersion (± 1 standard deviation).