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Stimulation and Recording Electrodes for Neural Prostheses
In prosthetic devices, electrodes are the interfaces between the implant system and
the body. Electrodes may be used for neural stimulation or neural signal recording
according to the application. The signals to be recorded are typically small, i.e.
some tens of microvolts for single pulse activity to a maximum amplitude of around
80 mV for intracellular potentials measured for example by fine-tipped electrolytefilled glass micropipettes in cognitive studies in brain machine interface. On the
opposite, neural stimulation sometimes needs relatively high electrode voltages and
current densities, sometimes as high as several volts, so it may lead to a high enough
energy transfer triggering chemical reactions that involve corrosion and changes in
electrode properties
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