EEG

?
What do neurons do?
Align perpendicular to cortical surface, dendrites closer to the surface and axons to unite matter
1 of 56
When is their firing of large neurons?
They can be recorded non invasively
2 of 56
What is EEG generated by?
Post synaptic potentials
3 of 56
When must activity occur?
In neurons where dendrites are closer to the surface, these neurons must fire together, this is when the signal is strongest
4 of 56
What is the Berger effect?
The suppression of amplitude in response to eyes opening
5 of 56
What are the Beta waves?
Most evident frontally dominant rhythm when subject is alert: eyes open
6 of 56
What are alpha waves?
Occipital maximum dominant, when subject is relaxed with eyes open or the onset of mental effort
7 of 56
What are theta waves?
Slow activity: Rare in adults when awake but perfectly normal in children (up to 13 years) and sleep
8 of 56
What are delta waves?
Dominant rhythm in infants (up to 1 year olds) 3 and 4 of sleep
9 of 56
What are event related oscillations?
Stimulus or task related changes in EEG oscillations in terms of frequency or amplitude: Temporal resolution tens to hundreds of milleseconds
10 of 56
What are event related potentials?
Waveforms in terms of latency relative to an event such as a sensory stimulus
11 of 56
When is it obtained?
Through time locked averaging of EEG; temporal resolution in tens of milleseconds
12 of 56
What is the example of event related oscillations?
Lateralised occipito parietal alpha oscillations dining visual spatial attention regionally specific change to ongoing alpha oscillations
13 of 56
What are ERPs?
Averaged EEG epochs
14 of 56
What is recorded?
EEG trials, time locked to the event of interest
15 of 56
What does each trial contain?
ERP and voltage fluctuations that are not time locked to an event
16 of 56
What does Averaging increase?
the signal to noise ratio of the ERP signal
17 of 56
Artifacts to be excluded from averaging are?
Movement of the eyeballs and muscle activity
18 of 56
What are exogenous ERPS?
Automatic responses of the brain, controlled by physical properties of the stimulus
19 of 56
When is it elicited?
Whenever modality - specific sensory pathway (auditory, somatosensory) is intact
20 of 56
What is it influenced by?
Intensity/frequency of stimuli
21 of 56
What is it important for?
Neurological diagnosis
22 of 56
what do endogenous ERPS reflect?
Interaction between subject and event
23 of 56
What is mesogenous?
Semi automatic but modulated by cognitive processes
24 of 56
What is N100 connected to?
Selective attention
25 of 56
What do stimuli differ along?
Two dimensions (Left, right ear) and pitch (low,high,tone)
26 of 56
What is attended to?
Low tones in right ear
27 of 56
What is the effect of attention?
Subtract respnses to standard tones in attended ear from resp. to standard tones in unattended ear
28 of 56
What is concluded?
Effect of selective attention emerges as early as 100ms after stimulus
29 of 56
What does N1p2 depend on?
Stimulus intensity Increase intensity and amplitude
30 of 56
What is the rate of stimulus presentation?
Rate slowed increase amplitude
31 of 56
What is topography?
Scalp distribution
32 of 56
What is mismatch negativity?
Preattentive processing of deviant features, sensory memory or echoic memory
33 of 56
What is shorter?
MMN latency, larger MMN amplitude
34 of 56
What is MMN in patients with schizophrenia?
Decrease in MMN amplitude
35 of 56
What is attenuation stronger for?
Duration deviants that for frequency deviants
36 of 56
When else was there attenuated MMN?
In first degree relatives of schizophrenic patients who are at risk of developing schizophrenia
37 of 56
What was found for MMN in children with dyslexia?
Decrease in amplitude and decreas in correlated to severity of dyslexia
38 of 56
What are endogenous P300s related to?
Classic P3, 3B response to task relevant oddball stimulus
39 of 56
What is it sensitive to?
Stimulus probability
40 of 56
What is reflected?
Categorisation of stimuli
41 of 56
What are novelty P3?
Responses to unexpected deviant stimulus
42 of 56
What is an ommitted stimulus?
When expected stimuli do not occur
43 of 56
What is endogenous ERPS?
Infrequently occuring targets, equally infrequent novel, environmental sounds
44 of 56
p300 found in schizophrenics?
Reduced auditory P300 amplitude, reflecting impairment in sustained attention
45 of 56
What is attenuated P300 also in?
First degree relatives of schizophrenic patients
46 of 56
What is a task that will activate N400?
The pizza was too hot to drink, cry, eat, semantically incongruent
47 of 56
What are movement related potentials?
Preceding voluntary movement RP, readiness potential
48 of 56
What is contingent negative variation?
CNV in S1-2 paradigm, orienting wave, expectancy wave
49 of 56
What is MEG stand for?
Magnetencephalography
50 of 56
What is this?
Electricall activity in the brain generates magnetic fields
51 of 56
They can be measured what?
Outside of the head
52 of 56
Skull is what in magnetic field?
Transparent
53 of 56
Better spatial resolution than what?
EEG, ERP
54 of 56
MEG responses to stimuli through?
Averaging
55 of 56
What does it require?
Low noise environmental, magnetic shielding
56 of 56

Other cards in this set

Card 2

Front

When is their firing of large neurons?

Back

They can be recorded non invasively

Card 3

Front

What is EEG generated by?

Back

Preview of the front of card 3

Card 4

Front

When must activity occur?

Back

Preview of the front of card 4

Card 5

Front

What is the Berger effect?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Psychology resources:

See all Psychology resources »See all EEG resources »