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. 2021 Jun 10;24(6):1339–1351. doi: 10.1007/s10071-021-01524-1

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© The Author(s) 2021

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Fig. 3 — Proportion trials in which the birds chose the first correct stimulus (S1) in the shifted reversal experiment. Note that this proportion was still high in the first trial after the reversal (vertical dashed line) but then steeply decreased. Note also that the visuo-spatial group performed better than the visual group. Negative trial numbers indicate trials before the reversal