electrodes placed on the skull- mostly measures summed synaptic excitation/inhibition on dendrites of cortical pyramidal neurons
1 of 13
iEEG- intracranial EEG
placing electrodes on the surface of the brain
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ECoG-electrocorticography
type of iEEG- recording from the cortical surface using subdural electrodes/ grid electrodes
3 of 13
local field potential (LFP)
is an electrophysiological signal generated by the summed electric current flowing from multiple nearby neurons within a small volume of nervous tissue
4 of 13
sampling frequency in analog-digital (A/D) conversion
action potentials (duration 1ms or less) need to be sampled at much higher rates (~20KHz)
5 of 13
Spectral (Fourier) analysis:
decomposing EEG signals into their constituent frequencies- which frequency is dominating
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Phase synchrony ("coherence")
infere cross-regional interactions- found less synchronous activity in frontal and parietal lobes in schizophrenia patients
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Depth electrodes
occurs in epileptic patients- locate seizures
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bandpass filtered signal
signal separated into individual frequency waves
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Spectrogram
- shows the power of the different frequencies at different time points
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Tetrodes
can discriminate between neuron activity- based on spacial information- place cell activity- can predict location of rat
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JUXTA recording- from single neurones
inject dye into active neuron- fixation purfuse tissue- immunohistochemistry
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Intracellular recording- from single electrode
impale neuron- can measure synaptic events with higher resolution
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Other cards in this set
Card 2
Front
placing electrodes on the surface of the brain
Back
iEEG- intracranial EEG
Card 3
Front
type of iEEG- recording from the cortical surface using subdural electrodes/ grid electrodes
Back
Card 4
Front
is an electrophysiological signal generated by the summed electric current flowing from multiple nearby neurons within a small volume of nervous tissue
Back
Card 5
Front
action potentials (duration 1ms or less) need to be sampled at much higher rates (~20KHz)
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