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. 2015 Aug 25;6:1243. doi: 10.3389/fpsyg.2015.01243

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Copyright © 2015 Kriengwatana, Escudero, Kerkhoven and Ten Cate.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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F1 and F2 values for the sets of speakers used for speaker and gender normalization conditions. S1 and S2 show the two stimuli sets used for Speaker normalization (all female tokens). Circled tokens were the FAM Go and No-go tokens used during the training, non-circled ones were the NEW test tokens. G1, G2, G3, and G4 were the stimulus sets used for Gender normalization (male and female tokens). In sets G1 and G2, the FAM Go and No-go tokens (circled) were female and the NEW test tokens male. In sets G3 and G3, the FAM Go and No-go tokens were male and NEW tokens female. In Experiment 1, birds were exposed to one of the stimulus sets, while humans were exposed to an S stimuli set and a G stimuli set (e.g., S1 and G1, G2 and S1). In Experiment 2, birds and returning human participants were exposed to the same set as Experiment 1.