科研之友
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摘要
A complexity estimating algorithm, cross approximate entropy (Cross-ApEn), was developed to analyze the instantaneous synchronization of cognitive ERPs, which could indicate the interactions of different brain regions during selective attention tasks. In order to illustrate the validity of Cross-ApEn's reflection of instantaneous synchronization, cross covariance was also calculated to compare with the final result. Two main phenomena can be noticed from this investigation: (1) The Cross-ApEn of electrode pairs over frontal and parietal areas became lower during the response period (0-400 ms) in both incongruent and congruent situations. (2) It was shown that Cross-ApEn presents lower value in incongruent situation than that in congruent one during response period (0-400 ms) at most electrode pairs. These results demonstrated that Cross-ApEn is effective to evaluate ERPs' instantaneous synchronization designating the cooperation of different brain regions and may bring a new view to cognitive neural imaging and recognition.
