Supporting Figure

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Supporting Figure 6

Fig. 6. Correlation of effective connectivity with behavior. For each participant and run, we computed a global connectivity index by averaging the connectivity parameters for attended retinotopic loci in V1, V2, and V4. This plot shows the means of these global connectivity indices averaged across runs and plotted against accuracy for all six participants (error bars correspond to SE between runs). There was a significant overall positive relationship between connectivity index and behavioral performance (R = 0.8160; P = 0.047), suggesting that participants who showed stronger attentional modulation of connectivity were able to perform better in the task. Whether this reflects the subjects’ current state or is a trait variable could be answered in a future study that measures brain activity and performance in the same subjects at different times. We found no significant difference between within-area, feed-forward, and feedback connections with respect to their correlation with behavior (F_2,10 = 0.282; P = 0.76, using Fisher transformation).