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Lecture 3 & 4: Electroencephalography (EEG) Questions With Solutions
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Lecture 3 & 4: Electroencephalography (EEG) Questions With Solutions Why did Burger study medicine? Because he was convinced that there is "psychic energy", which might allow for telepathy He wanted to discover the objective activity in the brain and "psychic phenomena", but he did not real...

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  • October 26, 2024
  • 17
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • Electroencephalography
  • Electroencephalography

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Lecture 3 & 4: Electroencephalography
(EEG) Questions With Solutions

Why did Burger study medicine? Because he was convinced that there is "psychic

energy", which might allow for telepathy




He wanted to discover the objective activity in the brain and "psychic phenomena", but he did

not realise the basis and potential of his discovery at the time




What else did Burger describe? Alpha rhythm: characteristic frequency of electrical signal

when eyes closed




What is the characteristic frequency of alpha rhythm? 8-13 Hz




How did Burger measure electrical activity? Initially, he used two electrodes, one attached

to the front of the head and one to the rear, and recorded the potential (i.e. voltage) difference

between them.




Initially, electrodes were silver wires placed under the scalp

, Lecture 3 & 4: Electroencephalography
(EEG) Questions With Solutions
Later, sliver foil placed on the scalp




Advantage of EEG Great temporal resolution




Disadvantage of EEG Poor spatial resolution




In the electrode cap, on which side are odd numbers? Left side




In the electrode cap, on which side are even numbers? Right side




What does EEG activity reflect? The EEG activity does not reflect action potentials but

originates mostly from post-synaptic potentials - voltages that arise when neurotransmitters bind

to receptors on the membrane of the post-synaptic cell




This causes ion channels to open or close, leading to graded changes in the potential across the

membrane

, Lecture 3 & 4: Electroencephalography
(EEG) Questions With Solutions
What can these "graded changes" in potential across the membrane be understood as? A

small "dipole": signals from single cells are not strong enough to be recorded outside of the head,

but if many neurons spatially align, then their summed potentials add up and create the signals

we can record




Where does this pooled activity from groups of similarly oriented neurons come from?

Mostly comes from large cortical pyramid cells




Functional unit of simultaneously activated neurons for EEG >10,000 neurons

simultaneously activated




What determines the sign of the recorded potential (negative or positive)? The orientation

of the neurons




What happens if neurons are perpendicular to the scalp? NO Signal!




When can signals not be recorded? When the orientation of the neurons is not conducive

to a homogenous signal as measured by the scalp

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