url: https://www.youtube.com/watch?v=f-86tS1F_ck&list=PLXKXgcv8muTKbyGsFVQSIeF5InZfrkt2M
title: "Overview 1"
description: "This video is from our free online course: Introduction to ERPs. The actual course can be found at https://courses.erpinfo.org/courses/Intro-to-ERPs. We reco..."
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Youtube MPI 的教程
url: https://www.youtube.com/watch?v=zDTsePeDlwo
title: "An introduction to EEG analysis: event-related potentials"
description: "Cognitive neuroscientist Daniel Acheson walks us through, with a real data set, how EEG data are processed so as to carry out an event-related potential (ERP..."
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favicon: https://www.youtube.com/s/desktop/3205cbb0/img/logos/favicon_32x32.png
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processing steps_from raw data to ERPs
Cleaning | artifact removal (eye movements)
Independent components analysis (ICA) to clean eye movements and blinks
Filtering
Remove high and low frequency signals
Epoching | segmenting
Take continuous signal and break into segments of interest (e.g., around an event)
How?
Extract time window of interest using the event codes 时间窗，一般会取 prior stimulus 的一小段时间~poststimulus 的一小段时间
Baseline correction
Put all epochs onto the same scale
How?
Subtract average signal for some amount of time before the epoch begins (i.e., the baseline period)
做完 baseline correction 之后，一般会做 2nd round artifact rejection, to remove epochs with extreme values
How?
Set criteria for thins like:
Maximum allowable range of signal from beginning to end of the epoch
Large, fast changes to the signal in shorter time windows
Averaging trials per subject
Get better signal for a given condition to extract data for statistics
How?
Average all trials of a given condition together
Averaging over subjects
Combine all subject data together for plotting average effects
