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. 2018 Nov 14;285(1891):20181610. doi: 10.1098/rspb.2018.1610

Figure 1.

Figure 1.

Graphical depiction of the four types of social test: (a) regular mirror-image stimulation; (b) non-reversing mirror-image stimulation; (c) stationary model test; (d) live opponent across transparent divider. (Online version in colour.)