A ONE-DIMENSIONAL CURRENT SOURCE-DENSITY ANALYSIS IS APPLICABLE TO THE MOUSE ACCESSORY OLFACTORY-BULB

Field potentials evoked in the accessory olfactory bulb (AOB) of the m ouse by a vomeronasal organ (VNO) volley were analyzed with current so urce-density (CSD) techniques. The potentials were recorded with an el ectrode oriented in the direction perpendicular to the laminae of the centre of the AOB in five tracks of equal spatial lattice for identica l coordinates. There were little or no differences in the amplitude or time course of the potentials at equal depth among the five tracks. T he CSD profile from a one-dimensional CSD analysis corresponded closel y with that of a three-dimensional CSD analysis of a central track in the AOB. Furthermore, VNO-evoked field potentials were recorded in the AOB external plexiform layer while an electrode was being moved in th e direction parallel to this layer. The potentials recorded at adjacen t points were nearly identical and hence the related one-dimensional C SD calculations revealed no net currents along this layer. These resul ts indicate that a one-dimensional CSD analysis is applicable to the m ouse AOB.