Abstract: The present disclosure relates to a neural probe system comprising: a carrier, at least one planar microelectrode attached to the carrier, the planar microelectrode comprising a set of two or more conductive segments, the set being confined in an area of from 15 ?m2 to 8000 ?m2, and electrical connections assuring that at least two sub-sets of conductive segments within the set are individually switchable to a same input and/or output line so that the surface area and/or the shape of the microelectrode electrically connected to the line can be varied.