EEG Recording and Data Preprocessing
This protocol is extracted from research article:
An ERP Study of the Temporal Course of Gender–Color Stroop Effect
Front Psychol, Jan 13, 2021; DOI: 10.3389/fpsyg.2020.613196

EEG data were recorded concurrently during the formal test via a 64-channel cap (Brain Products, Munich, Germany). All electrodes were arranged according to the international 10–20 system. Horizontal electro-oculogram (HEOG) and vertical electro-oculogram (VEOG) were also recorded. Electrode impedances were maintained below 5 KΩ, with a sampling rate of 1,000 Hz and a 0.01–35-Hz band-pass filter. The use of a 0.01–35-Hz band-pass filter in our study is a conventional choice, as many people believe that neural activities above 35 Hz do not arise from the brain and likely represent noise or artifacts (Libenson, 2009). EEG data were offline analyzed via the software ANALYZER 2.0. The original EEG data were re-referenced to the average of whole brain and then corrected for eye-blink artifacts (i.e., epochs with EEG power exceeding ± 100 microvolt). Afterward, the artifact-free data were segmented into 1,000-ms post-stimulus EEG epochs (baseline corrected with a 200-ms pre-stimulus interval) and then averaged for each stimulus type (i.e., masculine occupation words in pink, masculine occupation words in blue, feminine occupation words in pink, and feminine occupation word in blue). Following the convention (Libenson, 2009), peak amplitudes and latencies of P200 (150∼250 ms), N300 (250∼350 ms), N400 (350∼450 ms), and P600 (550∼650 ms) over 20 electrode sites (i.e., F1, F2, F3, F4, and Fz over the frontal area; FC1, FC2, FC3, FC4, and FCz over the frontal-central area; C1, C2, C3, C4, and Cz over the central area; P1, P2, P3, P4, and Pz over the parietal area) were extracted for statistical analysis.

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