1. Female and male pigs’ performance in a spatial holeboard and judgment bias task 
Sanne Roelofs, Rebecca E. Nordquist, Franz Josef van der Staay 
Applied Animal Behaviour Science 
Volume 191, Pages 5-16 (June 2017)
DOI: /j.applanim
Copyright © 2017 The Author(s) Terms and Conditions

2. Fig. 1
Overview of the holeboard arena. The four reward configurations (A, B, C and D) are highlighted (illustration: Yorrit van der Staay).
Applied Animal Behaviour Science  , 5-16DOI: ( /j.applanim )
Copyright © 2017 The Author(s) Terms and Conditions

3. Fig. 2
Constructional details of the food bowls used in the holeboard and judgment bias task. Each food bowl is equipped with a false bottom covering 4 candies to mask odour cues. A red ball covers the food bowl to hide visual cues (illustration: Yorrit van der Staay). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
Applied Animal Behaviour Science  , 5-16DOI: ( /j.applanim )
Copyright © 2017 The Author(s) Terms and Conditions

4. Fig. 3
Overview of the judgment bias task arena, with start box (S) and goal boxes (G) containing food bowls (illustration: Yorrit van der Staay).
Applied Animal Behaviour Science  , 5-16DOI: ( /j.applanim )
Copyright © 2017 The Author(s) Terms and Conditions

5. Fig. 4
Performance of female and male pigs in the spatial holeboard task. A Working memory (WM) and reference memory (RM) performance. B Trial duration (TD) and latency to first reward (LFR). C Number of locations visited (LOC) and number of rewards found (REW).
Applied Animal Behaviour Science  , 5-16DOI: ( /j.applanim )
Copyright © 2017 The Author(s) Terms and Conditions

6. Fig. 5
Judgment bias testing. A Optimistic choice percentage for female and male pigs. B Optimistic choice percentage of all pigs combined for first and last test sessions. C Latency to respond for female and male pigs.
Applied Animal Behaviour Science  , 5-16DOI: ( /j.applanim )
Copyright © 2017 The Author(s) Terms and Conditions