EEG

Question 1

What are the advantages of EEG?

Answer 1

• High temporal resolution
• Non-invasive, few exclusion criteria
• Portable
• Relatively cheap

Question 2

What method is used to placed the electrodes on the head?

Answer 2

The 10-20 system

Question 3

What kind of artefacts can corrupt the data?

Answer 3

Blinks, movements, muscle activity, eye movements

Question 4

How does pre-processing clean the raw data?

Answer 4

By:

• Subtracting systematic artefacts (blinks)
• Filtering irrelevant frequencies
• Rejecting data with unsystematic artefacts

Question 5

What are the components of the event related potential (ERP)?

Answer 5

• Early, exogenous - reflect mostly sensory responses

* Later, endogenous - reflect mostly internal, higher order processing

Question 6

What is the common experimental design for EEG?

Answer 6

• Compare two conditions that differ only by a variable of interest X
• Observe ERPs for both conditions
• Differences in ERPs reflect effect of X.

Question 7

What are the possible confounds in a EEG experiment?

Answer 7

• Physical stimulus properties
• Task difficulty
• Response requirements
• Number of trials per condition
• Order of tasks