Exam (elaborations)
EEG (electroencephalography) Exam Questions and Answers
- Course
- Institution
EEG (electroencephalography) Exam Questions and Answers
[Show more]
Content preview
EEG (electroencephalography) ExamQuestions and Answers
EEG pros - Answers -Excellent time resolution
- Cognitive, perceptual, linguistic, emotional processes are fast and dynamic
- For example, consider theta band (4-8 Hz), a slow rhythm but quite fast for our
conscious experience
- Or consider gamma (30 -80 Hz)
Direct indicator of neuronal activity
Multidimensional (time, space, frequency, power, phase, connectivity etc)
Portability (observing brain in action)
Relatively inexpensive
EEG cons - Answers -It is not well-suited for precise functional localisation
It is not well-suited for measuring deep brain structures (e.g., putamen, thalamus,
nucleus accumbens)--> Sub-optimal method: where in the brain does process X occur
or is information Y stored
It is also not very well-suited to study very slowly fluctuating process with uncertain and
variable time course
EEG reflects the ___________ of electrical potential overtime, created by the current
flows originating from neuronal populations - Answers -differences
Two types of neuronal electrical activity: - Answers -(i) action potential (AP)
(ii) postsynaptic potential (PSP)
Propagation of the Action Potential - Answers -[see image]
Chemical synapses - Answers -cause local changes in postsynaptic membrane
potentials, through neurotransmitters.
Information transmits with some delay on the order of a millisecond.
electrical synapses (gap junctions) - Answers -Ions flow directly through large channels
into adjacent cells, with no time delay
, Post-Synaptic Potential (PSP) - Answers -An electrical potential initiated at a
postsynpatic site that can vary in amplitude and spreads passively across the cell
membrane, decreasing in strength with time and distance
Generation of PSP - Answers -1. When AP reaches presynaptic axon end, a
neurotransmitter is released into the synaptic cleft
2. The neurotransmitter binds to the receptor of the postsynaptic neuron by opening or
closing an ion channels
3. This leads to a graded change in membrane potential
Two types of PSP - Answers -Excitatory PSP (for excitatory synapse)
Inhibitory PSP (for inhibitor synapse)
Recording Postsynaptic Potentials - Answers -[see image]
Neurons perform ____________________ to integrate synaptic inputs. - Answers -
information processing
A postsynaptic neuron will fire an action potential if a depolarisation that exceeds
threshold reaches its ______ _______ - Answers -axon hillock
Generally the combined effect of many _______________ synapses is required for a
post-synaptic neuron to fire - Answers -excitatory
Spatial Summation in a Postsynaptic Cell [1] - Answers -Threshold reached, AP
triggered
Spatial Summation in a Postsynaptic Cell [2] - Answers -Inhibition counteracts
excitation, no AP
Two Types of Summations - Answers -Spatial summation
Temporal summation
Spatial summation - Answers -the summing of potentials that come from different parts
of the cell. (caused by many presynaptic neuron)
If the overall sum - of EPSPs and IPSPs - can depolarize the cell at the axon hillock, an
action potential will occur.
Temporal summation - Answers -the summing of potentials that arrive at the axon
hillock at different times. (caused by one presynaptic neuron)
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller millyphilip. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
78252 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now