Lab 06

PSYC480

Usman Afzali

University of Canterbury

3/29/23

Recap

Processing

• Referencing and filtering
• Removing unwanted channels
• Removing artefacts
• ICA

Microstates

• Differences between Windows and Mac versions
• What else is needed for microstates analysis?

Mac MS

Microstates with Windows

Menu

Microstates with Windows…

Step 1

Microstates with Windows…

Step 2

Group level analysis

• Use Lab 6 demo dataset on Learn.
• Let’s process according to the pipeline!
• Watch Delorme’s video for a comprehensive tutorial.

Group level analysis continued

• Remove non-EEG channels
• Compute average reference
• Use ASR: by removing channel drift around 1 (0.75 and 1.25), recommended for ICA. Change the the minimum correlation to 0.7.
• Filter 2-20 for microstates
• Average reference again, and interpolate removed channel(s).
• Run ICA (with Picard) and the rest of the processing.
• Get average microstates (for both sets together).

Group level microstates

Should look similar to this figure.

To submit

• Use the the Lab 6 exercise dataset on Learn.
• Conduct pre-processing.
• Write the steps of pre-processing taken.
• Share the first screenshot (before any processing) and the final screenshot (post processing).
• You don’t need to include microstate analysis in this submission.

The END