Neural changes produced by 10-s AFB stimulus alternated with 10-s silence or control stimulus. Stimulus condition and time period (in parentheses) are indicated at top of columns. 1st and 2nd rows: spectrotemporal receptive fields obtained from MUA and LFPs, respectively. 3rd and 4th rows: frequency profiles of neural responses for MUA and LFPs, respectively. AFB bandwidth (notch width, Nw; indicated at top) was 0.5 octave in the 3rd–5th columns and 1 octave in the 6th–8th columns. The black and red lines represent the neural responses for the stimulus ensemble without AFB and with AFB, respectively. The black lines from the 1st column (for MUA and LFPs) are replicated in the 2nd–8th columns for comparison. Neural responses are greatly enhanced at the edges of the notch and decreased within the notch. The neural changes at the spectral edges are fast, i.e., they occur within 10 s of the stimulus with AFB presentation (3rd–4th columns and 6th–7th columns), and labile, i.e., they disappear within the following 10 s of the stimulus ensemble without AFB presentation (5th and 8th columns).