realizes is about has specified input has specified output characteristic of role of has role function neuron action potential evaluant role extracellular electrophysiology recording assay micro electrode cytometry assay single-unit recording Can be used on any cell, not just neurons. Gully Burns single-unit recording An extracellular electrophysiology assay where a single microelectrode is placed in close proximity to a single neuron to measure voltage and current changes over time. This is the technicque used by Hubel and Wiesel to measure firing properties of primary visual cortex neurons in the 1950s in their original Nobel-prize winning study. A classic, old technique. url:http://www.thieme.com/media/samples/pubid-80418214.pdf metadata complete