Fig. 9.

The double-H maze. Photograph showing a general picture of the testing device as it was installed for our experiment assessing behavioral flexibility (see Fig. 10 for an illustrated summary of the protocol used). Holding in a square of 160 cm × 160 cm and placed on a 80-cm high table, this device has been filled with opaque water (obtained by addition of powdered milk) to about 14 cm height. For each training session, an invisible escape platform is immerged in the water at the extremity of a constant arm; it is removed for each of the two probe trials. For further details about this test and protocol variants, see e.g., Cassel et al. (2012) and Pol-Bodetto et al. (2011).