In control condition, the mean peak-firing rate of area 17 neurons at 80.65 spikes/s (±54.45; range: 38.35–221.9; n = 11) was substantially higher than that of area 19 neurons in either control or PTV inactivation conditions (see above) but slightly lower than that (85.65 ± 60.05; range: 4.0–192.9) of area 17 neurons during inactivation of PTV (Figure 5D).