EEG

Question 1

Measures

Answer 1

electro-chemical signals given off by the brain, giving a continuous line of activity

Question 2

Equipment

Answer 2

Electrode Cap (usually 32 or 64 electrodes), recorder, amplifier

Question 3

Spatial Resolution

Answer 3

limited, can’t show brain localisation as each electrode produces an output that reflects a group of neurons around it

Question 4

Temporal Resolution

Answer 4

excellent, real time brain activity tracked

Question 5

Artefacts

Answer 5

EEG readings effected by eye, head movements etc. making imaging some populations difficult, can remove with algorithms (Runnova et al., 2016)

Question 6

Schmidt et al (2016)

Answer 6

EEG readings can be used to diagnose epilepsy

Question 7

Acharya et al (2015)

Answer 7

Nonlinear aspects of EEG readings can be used to create a depression diagnosticity index which has a diagnostic accuracy of 98% for depression

Question 8

ERPs

Answer 8

event related potentials, average of many EEG trials to cancel out activity unrelated to the stimulus being tested, shows clear isolatable components

Question 9

Practise Effects/ Fatigue

Answer 9

because so many trials are needed to create an ERP, EEG studies are subject to practise effects or fatigue, which may be overcome with a good design - counterbalancing stimulus/ non-stimulus and varying conditions within rather than between trial blocks

Question 10

Vogel et al (1998)

Answer 10

attentional blink (can’t recall T2 if is appears between 100 and 600ms after T1) occurs because T2 is not stored in working memory - completely suppressed P3, but P1 and N4 are intact meaning T2 is still perceived and recognised

Question 11

Vogel and Luck (2002)

Answer 11

attentional blink occurs because T2 is overwritten by subsequent stimuli, so when T2 is the last stimulus in the sequence no attentional blink is seen