Summary: Mind As Machine
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brain computer interfaces
This is a preview. There are 14 more flashcards available for chapter 01/01/2016
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What can cochlear implants be used for?
In young children the inability to hear can lead to the inability of speech. So it is to rescue language development -
Why is the EEG a useful tool?
Direct reflection of activity
High temporal resolution
Portable
Non-invasive
Inexpensive -
Why are potentials not equal around the head?
Because the electric field decays with distance to the electric dipole source -
What is an electric dipole?
There is an unequal distribution of positive and negative charges in the extra-cellular space because of the EPSC giving rise current sinks -
How many channels is research standard?
20 -
What are factors that influence an EEG measurement?
Position of reference
Electrical contact between scalp and electrode(wash hair)
Conductivity of the head
Number of active neurons
Synchronicity
orientation of the cell
Distance from source to electrode
Orientation of the dipole
Site of activitation on the neuron
exctitation vs inhibition -
Why is synchronicity important in EEG research?
Because of the minute fields and fast decay of the signal you need mass-neuronal activity -
What is a different name for the midline on an EEG?
The Z-line -
What is a radial dipole and where is the negative potential?
A radial dipole points upwards to the outside so the negative charge is in the deeper brain areas and thus not visible on the EEG -
What is a tangential dipole and where is the negative potential?
A tangential dipole is oriented in the direction of the scalp there on an EEG there is a transition from negative to positive potential
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