Brain network analysis reveals presentation rate dependent reorganizations during visual target detection

EEG-based target detection has attracted accumulating attention. However, understanding of the neural mechanisms from the perspective of functional connectivity alterations remains limited, especially under varying presentation rates - a crucial parameter in rapid serial visual presentation (RSVP) tasks. Here, we conducted a RSVP experiment with two presentation rates (i.e., 200 and 400 ms) and employed graph theory to quantitatively investigate the brain network reorganization. The alterations of brain network were assessed at both global (i.e., $E_{g l o b}$ and $E_{l o c}$) and nodal (i.e., $E_{n o d a l}$) levels. As expected, mean accuracy at 200 ms rate was significantly lower than 400 ms. Distinct reorganizations between target and non-target stimuli at both global and nodal levels were observed between the two rates. Specifically, we observed significant increases in $E_{g l o b}$ and $E_{l o c}$ with higher presentation rates in the non-target stimuli. Moreover, channels with significant differences were mainly resided in the posterior parietal and occipital areas in $\gamma$ band. In sum, these results provide quantitative insights into the complex neural mechanisms involved in the target detection process.