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. Author manuscript; available in PMC: 2009 Nov 30.
Published in final edited form as: J Acoust Soc Am. 2009 Sep;126(3):1321–1335. doi: 10.1121/1.3179676

FIG. 8.

FIG. 8

Performance of two ferrets when the reference roved between two F0 values across trials. Right spout choice probabilities (mean + standard deviation, across 8 consecutive testing sessions) are plotted across the four reference and target combinations presented in the “variable reference” testing sessions. This type of testing was carried out with Ferret 2 (black bars) and Ferret 3 (white bars).