Figure 1.

Combined determination of the angular tuning preference and location of relay cells within a barreloid. PSTHs were compiled from 20 responses to ramp-and-hold deflections of vibrissa D4 in eight different directions (a). Maximum ON responses were observed after upward deflection (polar plot in c). After the test, the cell was stained juxtacellularly with Neurobiotin, and a photomicrograph (b) shows its location in the dorsal part of barreloid D4, which had been prelabeled by the retrograde transport of FG. Scale bar, 100 μm. d, e, Distribution of tuning ratios and tuning indices, respectively, for the 30 VPM cells sampled in the present study.