Behavior and ERP data of geometric shapes and social role priming effects based on the global-local paradigm

The Cz electrode site serves as the online reference electrode, with a sampling rate of 1000Hz, and all electrode impedances are maintained below 50kΩ. This experiment used real-time recording of continuous EEG data, which was subsequently analyzed offline by the EEGlab toolbox based on Matlab R2019a software (Delorme & Makeig, 2004) .EEG data were analyzed using EEGlab with binaural mastoid as a re-reference, and offline processing was performed using 0.1-30 Hz bandpass filtering.

Artifacts such as electro-oculogram, electro-myography, and drift were removed using independent component analysis, and trials with amplitudes exceeding a threshold of ±100 μV were automatically rejected. Data segmentation is conducted over a period spanning 200 ms before stimulus presentation and 800 ms post-presentation, with baseline correction applied using the average amplitude of the 200 ms pre-stimulus period.