Figure 4
From: Discrimination of natural acoustic variation in vocal signals
(A) Description of human psychophysical testing. Subjects were stationed at the same computers which controlled the bird operant tasks, outfitted with Sennheiser HD280PRO headphones, and given a response panel with two keys. Subjects were told they would be listening to a repeating background sound, during which they should press the observation key to cause a change in the background and to press the report key whenever they heard a change. (B) Performance (PC*, mean ± SEM, N = 3) on discriminating the different renditions of vowels from a single human speaker. (C) Performance (PC*, mean ± SEM, N = 3) on discriminating the different renditions of zebra finch song.
