Directional responses obtained using ITD+ILD stimuli. A–F, Anechoic (black lines) and reverberant (gray lines) DRF obtained from six ITD-sensitive IC neurons using ITD-only (solid lines) and ITD+ILD (dashed lines) virtual space stimuli. Neurons in the left, middle, and right columns belong to the intermediate-, peak-, and trough-type ITD tuning shape groups, respectively.