n, pl  -re*ses   :  a process for observing or recording the effect of an ionized substance on nerve cells that involves inserting a double micropipette into the brain close to a nerve cell, injecting an ionized fluid through one barrel of the pipette, and using a concentrated saline solution in the other tube as an electrical conductor to pick up and transmit back to an oscilloscope any change in neural activity mi*cro*ion*te*pho*ret*ic adj mi*cro*ion*to*pho*ret*i*cal*ly adv 
 
 
 
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