Figure 3.

Intracortical inputs are more sharply tuned than thalamocortical inputs. (a–h) Change in excitatory synaptic TRF in another four cells. a, c, e, g, Top, color maps represent the excitatory synaptic TRF before and after cocktail application. Bottom, kinetics of the rising phase of synaptic currents (1–IV). The curved line outlines the boundary of synaptic TRF before (blue) and after (red) cocktail application (V). Data are presented in the same way as in Fig. 2. b, d, f, h, Top, excitatory synaptic currents evoked by tones (at 70 dB) of different frequencies before and after cocktail application. The amplitudes of currents after application are corrected. Bottom, excitatory tuning curves at 70 dB before (blue) and after (red) cortical silencing. Data are presented in a similar manner as in Fig. 2. Black lines are for the subtracted inputs. (i) Half-peak bandwidths of tuning curves at 70 dB for total excitatory inputs (before), thalamic inputs (after) and intracortical inputs (subtracted). Data points from the same cell are connected with lines (n = 5, paired t-test, * P < 0.01). (j) Average ratio of onset latency, intensity threshold of excitatory synaptic TRF, bandwidth at 10 dB above the intensity threshold (TRF BW), and half-peak bandwidth of tuning curve at 70 dB (half-peak BW) between after and before values. Bar = s.d.