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. 2014 Nov 12;8:128. doi: 10.3389/fnana.2014.00128

FIGURE 3.

FIGURE 3

Artiodactyl brains gain mass with a different relationship to body mass compared to other mammals. Scaling relationships for artiodactyl brains (in black) are plotted along with rules found previously for other groups (primates in red, glires in green, afrotherians in blue, insectivores in orange, scandentia in gray). Graphs relate (A,B) total brain mass (excluding the olfactory bulb) and (C) total numbers of neurons in the brain (excluding the olfactory bulb) to body mass. (A,C) our dataset; (B) our dataset (filled circles), and dataset of Boddy et al. (2012; open circles). Each point represents the average values for each species. Only the power functions for Artiodactyla are plotted (excluding the pig), along with the 95% confidence interval (dotted line). Exponents are 0.555 ± 0.029 (A, brain mass × body mass), 0.596 ± 0.031 (B, brain mass × body mass, for the Boddy dataset exclusively), and 0.425 ± 0.069 (brain neurons × body mass). Data from Herculano-Houzel et al. (2006, 2007, 2011), Azevedo et al. (2009), Sarko et al. (2009), Gabi et al. (2010), and Neves et al. (2014).