Physiology - Electroencephalography (EEG) (B7) Questions With Solutions
2 views 0 purchase
Module
Electroencephalography
Institution
Electroencephalography
Physiology - Electroencephalography (EEG)
(B7) Questions With Solutions
A flat EEG (no electrical activity) is clinical evidence of death
Patterns of rhythmic neuronal electrical activity recorded are called brain waves (brain
rhythms)
scalp EEG a pair of electrodes are attached to scalp con...
Physiology - Electroencephalography (EEG)
(B7) Questions With Solutions
A flat EEG (no electrical activity) is clinical evidence of death
Patterns of rhythmic neuronal electrical activity recorded are called brain waves (brain
rhythms)
scalp EEG a pair of electrodes are attached to scalp connected to a differential amplifier
•Amplifier will reveal a pattern of voltage fluctuations over time
•Amplitude between -100 µV and +100 µV
•Frequency 0-100 Hz
neural basis of EEG - its a measure of the extracellular current flow from the summated
synchronous activity of many neurons
- The most important source of extracellular flow of ions in brain tissue is triggered by excitatory
and inhibitory postsynaptic potentials
- collects the activity mainly from cell layers that are oriented perpendicular to the surface of the
cortex
, Physiology - Electroencephalography (EEG)
(B7) Questions With Solutions
positive deflection EEG EPSPs in deeper layers and IPSPs in superficial layers
negative deflection EEG EPSPs in superficial layers and IPSPs in deeper layers
can scalp EEGS alone determine cortical synaptic events no
can APs of neurons be detected on the scalp no
- they are asynchronous and too fast to generate detectable potentials
what happens to electrical activity from deeper generators it gets dispersed and attenuated
by volume conduction effects
what activity might scalp EEG indirectly trace The activity from deeper structures may
drive cortical pyramidal neurons
EEG collects its activity from which cell layers cell layers that are oriented perpendicular
to the surface of the cortex (prymidal neurons)
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 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 UpperClass. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £10.41. You're not tied to anything after your purchase.
