Measuring brain activity/EEG (MEG)
10 important questions on Measuring brain activity/EEG (MEG)
What is measured by the technique?
Here we measure electricity from the brain (voltage)
And voltage is the electrical pressure or potential (Volts)
Which 5 frequency ranges exist?
Gamma 30+ Hz
BEta 13-30 Hz
Alpha 8-12 Hz
Theta 5-7 Hz
Delta 1-4 Hz
What means a Delta rhythm?
State of mind is deep sleep, oscillations in thalamus and deep cortical layers. Location is variable, mostly frontal
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What is meant by a theta rhythm?
Local is variable: frontal or temporal. Sleepiness
Related to inhibition of elicited responses
What is meant by Gamma rhythm?
Mental activity. Reflects sensory and cognitive processing muscle activity, related to meditation?
What is meant by quantitative EEG, induced activity >> task-related, but not time locked)
? Ongoing signals and their response
What is meant by event-related activity?
Evoked activities time-locked to a stimilus (averaged signal, noise reduction)
What are the two major components of ERP? Event-related potential
Early components > reflect pysical characteristics of sensory stimulus (exogenous)
Later components reflects allocation of attention and cognitive effort, motivational tendencies (endogenous)
What is meant by the Contingent Negative Variation (CNV)?
In response to a warning of target, priming
What are the four 'error detection' components?
Mismatch NEgativity (MMN) : processing of deviant stimuli, even when not attended
P3/P300 : Oddball paradigm, salience
P400 : Language incongruency
Error-related negativity (ERN)
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