Fig. 1.

Extracellular recordings from OB and HC.A, Lesions marking recording sites in OB mitral cell body layer (OB) and hippocampal CA1 and CA3 pyramidal cell layer. Arrows indicate recording site lesions.Open circles on the contralateral side indicate the location of lesions from other recordings. B, Continuous extracellular recording from OB. The high background activity is characteristic of mitral–tufted cell body layer. Ch1,Ch2, and Ch3 are simultaneously recorded channels from a tetrode. C, Triggered extracellular recordings from CA1 pyramidal cell layer. D, Triggered extracellular recordings from CA3 pyramidal cell body layer. Triggered recordings from OB, CA1, and CA3 were used for cluster cutting and additional analysis. For details, see Materials and Methods.