Fig. 7.

Data from an identified thalamic barreloid.A, Effects of adjacent whisker trimming on two thalamic units recorded at the lesion site in the C3 barreloid shown in Figure1B. Note decreased activity in both cases after trimming. B, Confirmation of C3 as the PW. After behavioral testing, the rat was anesthetized with halothane, and controlled whisker stimuli (Simons, 1983) were applied individually to C3 and each of the eight surrounding whiskers. Spike counts were obtained from the multi-unit record with the amplitude threshold set high to discriminate the two largest units, which corresponded to the individual units of A. The C3 whisker was trimmed to the same length as the previously clipped adjacent whiskers.