Fig. 5.

Basic morphological and electrophysiological characteristics of RGs. A1–A3 show camera lucida drawings from representative cells of this class. Calibration bar, 50 μm. Note the triangular cell body from which two main diverging dendritic shafts emerge and the axon collateral ramifying in st. oriens/alveus (arrows).B shows the voltage response to current injection; a train of action potentials was elicited by positive current, whereas a depolarizing sag was apparent on negative current injection. A brief burst of action potentials was observed on the anode break. In double-recording experiments (C), the onset of the EPSP preceded the onset of the peak of fPS (arrow) (−3.8 msec), suggesting feedforward activation.