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(A–D) Stereological measurements of neuron density in four species of New World monkeys. Neuron density decreases toward the anterior. Linear regression confirms the high significance (p < 0.002, one-tailed t-test) of the trend in (A,B, and C). For (D), Cebus apella, (p = 0.08). (E–F) Neuron soma size in cortical layers II and III. Soma size increases toward the anterior isocortex (in E, p = 0.09; F, p = 0.0008; G, p = 0.03, H, p = 0.001 using a one-tailed t-test).
