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Lecture 3 & 4: Electroencephalography (EEG) Exam Questions and Answers 100% Pass $12.49
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Lecture 3 & 4: Electroencephalography (EEG) Exam Questions and Answers 100% Pass

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Lecture 3 & 4: Electroencephalography (EEG) Exam Questions and Answers 100% Pass What is Electroencephalography (EEG)? - A method of detecting neural activity by placing electrodes on the scalp How does EEG work? - Electrodes pick up small fluctuations of electrical signals, originating from ...

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  • January 9, 2025
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Lecture 3 & 4: Electroencephalography
(EEG) Exam Questions and Answers
100% Pass

What is Electroencephalography (EEG)? - ✔✔A method of detecting neural activity by placing electrodes

on the scalp


How does EEG work? - ✔✔Electrodes pick up small fluctuations of electrical signals, originating from

activity of (mostly cortical) neurons


Nature of electrical signals - ✔✔Very noisy and might not look like much but systematically related to

cognitive processes


How is EEG recorded? - ✔✔Either at the scalp (non-invasive) but also possible to record


intra-cranial EEG by measuring activity directly at the exposed cortex


Logistics of EEG - ✔✔Cheap and (relatively) easy to conduct


Hans Berger (1873-1941) - ✔✔Detected the first EEG signal in 1924 with electrodes attached to the scalp of

a human (his wife) and reported the results in 1929


Why did Burger study medicine? - ✔✔Because he was convinced that there is "psychic energy", which

might allow for telepathy




Author. Emily Charlene, ©2025 All Rights Reserved.

, 2|Page


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




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




Author. Emily Charlene, ©2025 All Rights Reserved.

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