Structure, frequency tuning, and response selectivity to chirps of LFIs. A, Reconstructions of intracellular stainings of three types of LFIs in the prothoracic ganglion. B, Iso-intensity response functions of LFIs at 80 dB SPL. Error bars show SD values. C, Characteristic examples of LFI responses to chirps presented alone and under the masking trill. D, Characteristic examples of responses of LFIs to a chirp without trill (top) and a masked chirp (bottom).