The FLRFs of a neuron showing that the modulation of frequency tuning by preceding noise was temporal- and level-dependent. Panel A depicts the control FLRF. The other panels in each row show the masked FLRFs determined at various ISI and masker level conditions. The panels in each column from rows two to four represent the masked FLRFs determined at a fixed ISI (numbers shown on the top panels of row 2) and under various masker level conditions. The numbers on the right to column six indicate the masker level for that row, i.e., 50 dB SPL (B), 60 dB SPL (C), and 70 dB SPL (D).