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The Stroop effect is a well studied phenomenon in psychology. It is often used in cognitive neuroscience to study attention and cognitive control. In a typical experiment, subjects are presented with a word that names a color (e.

The mne library offers a builtin plotting option for what is commonly referred to as topo plots. These plots take a single value per EEG/MEG channel and try to show the distribution across the scalp by proving a ventral (top -> down) view of the channel positions and interpolating values in between to create a quasi-head-shaped heatmap.