Relationship between (a) the latency in food extraction using the preferred hand (i.e., the maneuvering hand, see mangalam et al. [1]) and the laterality in hand performance (LHP) in the hand-performance-differentiation task, and (b) the LHP in the hand-performance-differentiation task and the absolute difference between the laterality in hand usage in the unimanual and the bimanual food-reaching tasks. n = 10.

<p>Relationship between (a) the latency in food extraction using the preferred hand (i.e., the maneuvering hand, see mangalam et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0119337#pone.0119337.ref001" target="_blank">1</a>]) and the laterality in hand performance (LHP) in the hand-performance-differentiation task, and (b) the LHP in the hand-performance-differentiation task and the absolute difference between the laterality in hand usage in the unimanual and the bimanual food-reaching tasks. n = 10.</p

Hand and Cheek Pouch Usage by the Macaques (n = 14).

<p>‘L’ and ‘R’ indicate left and right respectively;</p>a<p>preferred hand/cheek pouch: z≤1.96: L; −1.96</p

Relationship between Hand and Cheek Pouch Usage among the Macaques (n = 14): while Filling (A) and Emptying (B).

<p>Relationship between Hand and Cheek Pouch Usage among the Macaques (n = 14): while Filling (A) and Emptying (B).</p

Raw data on hand usage for the macaques in the unimanual and the bimanual food-reaching tasks (n = 16), and the hand-performance-differentiation task (n = 10).

<p>Raw data on hand usage for the macaques in the unimanual and the bimanual food-reaching tasks (n = 16), and the hand-performance-differentiation task (n = 10).</p

Apparatuses for the unimanual food-reaching task (a), the bimanual food-reaching task (b), and the hand-performance-differentiation task (c).

<p>Reproduced, with permission from Wiley Periodicals, Inc., from Mangalam et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0119337#pone.0119337.ref023" target="_blank">23</a>] © 2013 Wiley Periodicals, Inc.</p