Major EEG Components

Question 1

2 major auditory components:

Answer 1

N1, MMN

Question 2

2 major P3 components:

Answer 2

P3a, P3b

Question 3

3 Lateralized ERP Components:

Answer 3

PCN (N2PC), CDA (SPCN), LRP

Question 4

Visual C1 largest over:

Visual C1 originates from:

Answer 4

Largest over posterior midline

Originates from primary visual cortex (V1)

Question 5

Visual C1 sensitive to:

Answer 5

Perceptual parameters (stimulus contrast & spatial frequency)

Question 6

Visual C1:

Upper part codes ____ visual field, and lower part codes ____ visual field

Answer 6

Upper part codes LOWER visual field, and lower part codes UPPER visual field

Question 7

3 important visual components:

Answer 7

C1, P1, N1

Question 8

ONLY component with BOTH visual and auditory forms:

Answer 8

N1

Question 9

Visual P1 largest at:

Visual P1 originates from:

Answer 9

Largest at lateral occipital electrode sites

Originates from dorstral extrastriate cortex (early P1) and ventral fusiform gyrus (later P1)

Question 10

Visual P1 sensitive to:

Answer 10

Spatial attention and feature attention–largest when stimulus is spatially attended

Question 11

Luminance dot change paradigm demonstrates which component?

Answer 11

Visual P1– wave enlarged when probe presented in the attended color

(P1 associated with spatial & feature attention)

Question 12

Which components both have 3 sub-components?

Answer 12

Visual N1 & Auditory N1

Question 13

Later portions of Visual N1 originate from:

Answer 13

1) Parietal cortex and 2) lateral occipital cortex

Question 14

Which Visual N1 sub-components are anterior and posterior?

Answer 14

Anterior N1 = earlier portion

Posterior N1s (2) = later portion

Question 15

Visual N1 sensitive to:

Answer 15

Task demands, subjects’ processing speed capacity, previous sensory modality, and spatial attention

Associated with discriminating stimuli and cross-trial modality changes

Question 16

Auditory N1 sub-components and their origins:

Answer 16

1) Fronto-central (auditory cortex)
2) Vertex maximal potential (unknown)
3) Laterally distributed (superior temporal gyrus)

Question 17

Auditory N1 sensitive to:

Auditory N1 reflects:

Answer 17

Sensitive to attention, stimulus predictability, sound repetitions, and sensory refractoriness (larger ISIs=larger N1s)

Reflects sensory processing onset & detection process

Question 18

Which auditory component is suppressed with self-intiated sounds, relative to external initiated sounds?

Answer 18

Auditory N1

Question 19

Auditory: MMN is largest at:

Answer 19

Mismatch negativity (MMN) largest at central midline

Question 20

Auditory MMN sensitive to:

Answer 20

rule violations (grammar in mother tongue)

thought to reflect automatic process comparing stimuli to memory (elicited without attention/tasks)

Question 21

P3 Family sensitive to:

Answer 21

Sensitive to target probability (unpredictable stimuli in a task)–independent of sensory modality

Question 22

P3a also called:

P3a is distributed in which area:

Answer 22

“Novelty P3” - fronto-central maximum

Frontally distributed

Question 23

P3b also called:

P3b is distributed in which area:

Answer 23

“Classic P3” - parietal maximum

Parietally distributed

Question 24

Which components does the oddball paradigm relate to?

Answer 24

P3 Family:

• P3a = infrequently occurring distractors
• P3b = infrequently presented target among frequent stimuli

Question 25

PCN originates in:

PCN strongest over:

Answer 25

Posterior Contralateral Negativity (PCN) originates in ventral occipito-temporal cortex

Strongest over visual areas contralateral to an attended stimulus location

Question 26

PCN could reflect:

Answer 26

Could reflect attentional selection, interference from distractors, also saliency of target and numerosity

Question 27

PCN stands for:

Answer 27

Posterior Contralateral Negativity

Question 28

CDA stands for

Answer 28

Contralateral Delay Activity

Question 29

CDA is ____(+/-) over parietal, occipital, and temporal sites contralateral to attended hemifield

Answer 29

CDA is NEGATIVE over parietal, occipital, and temporal sites contralateral to an attended hemifield

Question 30

CDA sensitive to:

Answer 30

CDA sensitive to amount of currently stored WM info

increases with # of stored objects

Question 31

CDA could reflect:

Answer 31

CDA could reflect feedback-driven process to extract identity info from WM representations

Question 32

LRP stands for:

Answer 32

Lateralized Readiness Potential

Question 33

LRP reflects:

Answer 33

LRP reflects preparation/production of motor response

strongest over contralateral areas to hand/food movement

Question 34

LRP polarity varies: ____(+/-) for manual responses, ___(+/-) for foot responses

Answer 34

LRP is NEGATIVE for manual responses, POSITIVE for foot responses

(mneumonic: LRP is POSITIVE for PODIATRISTS)

Question 35

Aliasing means:

Answer 35

Signals become indistinguishable, may appear as a different frequency

(filters can cause this)

Question 36

LRP can be stimulus-locked and response-locked, what do each of these reflect?

Answer 36

Stimulus-Locked LRP: time required to SELECT motor response

Response-Locked: time required by motor-response PRODUCTION process