A, top schematic diagram depicts the typical configuration for simultaneous current-clamp recordings (CC) from soma and dendrite. The lower schematic diagram shows the configuration for electronic excision of the dendrite (EE) in which the voltage signal recorded via the somatic pipette is used as the voltage command for the dendritic amplifier in voltage-clamp mode. This configuration eliminates, in real time, any membrane potential difference between the dendritic and the somatic pipette resulting in a functional excision of the dendrite. B, traces from a representative example showing that electronic excision of the dendrite reduced the size of the ADP recorded at the soma. C, plot showing the average effect of electronic excision of the dendrite on the ADP recorded at the soma in 18 different pyramidal neurons. The excision significantly (**P < 0.01) decreased the amplitude of the somatic ADP.