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Distribution of BDs and delay response profiles in the population of 3D neurons. BDs were between 4 and 40 msec, which corresponds to target ranges of 68–680 cm (1 cm of distance adds 58 μsec to echo delay). The mean BD for the population of 32 units was 13.5 ± 8.1 msec (A). Based on the shape of the delay-response profiles, 3D units were classified as selective (B), twin-peaked (C), or broadly facilitated(D). Individual units are indicated by different line styles.
