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Physiology - Electroencephalography (EEG) (B7) Exam Questions and Answers
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Physiology - Electroencephalography (EEG) (B7) Exam Questions and Answers
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Physiology - Electroencephalography(EEG) (B7) Exam Questions and
Answers
A flat EEG (no electrical activity) is clinical evidence of - Answers -death
Patterns of rhythmic neuronal electrical activity recorded are called - Answers -brain
waves (brain rhythms)
scalp EEG - Answers -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 - Answers -- 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
positive deflection EEG - Answers -EPSPs in deeper layers and IPSPs in superficial
layers
negative deflection EEG - Answers -EPSPs in superficial layers and IPSPs in deeper
layers
can scalp EEGS alone determine cortical synaptic events - Answers -no
can APs of neurons be detected on the scalp - Answers -no
- they are asynchronous and too fast to generate detectable potentials
what happens to electrical activity from deeper generators - Answers -it gets dispersed
and attenuated by volume conduction effects
what activity might scalp EEG indirectly trace - Answers -The activity from deeper
structures may drive cortical pyramidal neurons
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