Fig 2. Synchronized BOLD fluctuations. A, Time series data from 1 subject. Six minutes of data are shown. Traces represent average BOLD signal intensity from regions of interest in the bilateral primary visual cortex (V1), left LGN, and bilateral frontal eye fields (FEF). B, Cross-correlation analysis represents full 14-minute resting state data from regions listed previously. Bilateral V1 shows strong focal correlation, with similar but diminished correlation between V1 and LGN. No correlation is seen between V1 and FEF. Bilateral FEF show much broader temporal correlation. C, Summary resting state BOLD cross-correlation from 6 subjects. Green traces show cross-correlograms for individual subjects, and black traces show an average cross-correlogram across subjects (bilateral V1, n = 6; left V1-left LGN, n = 3; left V1-left FEF, n = 2, left FEF-right FEF: n = 2).