Lecture 3 - CNS

Question 1

EEG analysis steps

Answer 1

1. preprocessing, e. g. artifact removal

2. analytic approaches, e. g. ERPs, timefrequency, decoding etc.

Question 2

Franciscus Donder

Answer 2

1868
mental chronometry experiments
Donder’s subtraction method
to isolate cognitive processes

Question 3

subtraction method assumptions

Answer 3

processes are independent

can be subtracted linearly

Question 4

minimal number EEG trials

Answer 4

150

Question 5

signal to noise ratio

Answer 5

improvement is not linear

proportional to square root of trials

Question 6

epoching

Answer 6

segments signal

into trials per condition and baseline windows

Question 7

baseline correction

Answer 7

cuts out noise
mostly slow low frequency drifts
trial wave is subtracted with baseline window average

Question 8

peak phrenology

Answer 8

attaching concrete functions to specific peaks

too simple

Question 9

difference wave

Answer 9

polarity doesn’t matter

-> only depends on what has been subtracted from what

Question 10

statistical tests in EEG

Answer 10

permutation test
or t-test

multiple comparison problem arises

Question 11

multiple comparison corrections

Answer 11

Bonferroni, the most conservative
split-half
cluster-based permutation testing
FDR correction