To study how cortical neurons express directional information about a stationary echo source, responses of single neurons were recorded from the Doppler‐shifted—CF‐processing area of the mustache bat (Pteronotus parnellii rubiginosus). All cortical neurons studied were excited by contralateral stimuli and were either excited or inhibited by ipsilateral stimuli. They are called E‐E and I‐E neurons, respectively. Each penetration orthogonal to the cortex was characterized by either E‐E neurons. I‐E neurons, or neurons exhibiting binaural interaction, which varied with depth. Thus the cortex consists of three types of binaural columns. E‐E neurons were poorly directional and showed maximum responses to tone bursts directed at the front of the head. I‐E neurons were sharply directional. E‐E neurons (or columns) were mainly located ventrally in the Doppler‐shifted—CF‐processing area, while I‐E neurons were mainly distributed dorsally. E‐E neurons, which were more sensitive to weaker echoes, are suited for integrating signals from both ears for echo‐detection. I‐E neurons, which were more sensitive to stronger echoes, are best suited for processing echo direction. [Work supported by NSE.]