Grand average results.

<p>The concentration changes of oxy- and deoxyHb were averaged across the 12 blocks for each condition and for each channel. Numbers and location of channels correspond to the placement shown in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0140160#pone.0140160.g002" target="_blank">Fig 2A</a>. The x-axis represents time in seconds; the y-axis shows concentration in mmol x mm. The rectangle along the x-axis indicates time of stimulation. The continuous red and blue lines in the graphs represent oxyHb and deoxyHb concentrations, respectively, in response to the ABC grammar. The dashed magenta and cyan lines represent oxyHb and deoxyHb concentrations, respectively, in response to the ABB grammar. Note that the time line on the x-axis is of adequate duration given that it corresponds to the following sequence of events: 5s time-window preceding the onset of the block, block presentation (9.9s or 10.9s), and the following long inter-block silences (20 s or 25 s), thus a total duration ranging from 34.9s and 40.9s. This total period was divided in 7 time windows of equal length (~5.7s), and only the signal obtained between the time-windows 2 and 6 was used for statistical analyses, i.e. approximately between 5.7s and ~28.6s after block onset.