Figure 1: Schematic representation of the T-maze apparatus and virtual zones delimitation on the bottom of the maze defined for the video recordings analysis. Dotted lines are transparent Plexiglas® walls, continuous lines are white opaque plastic. The bottom of the maze is made of transparent Plexiglas®. 1. Start-box closed by a removable opaque wall; 2. Post-Start; 3. Pre-left: area located on the right side of the left area; 4. Pre-right: area located on the left side of the right area; 5. left area located near the compartment where congener was placed; 6. right area located near the compartment where congener was placed; 7. left and right compartments closed by a waterproof transparent Plexiglas® wall where congener was placed.

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