Compare the Brains

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LB1 and microcephalic Homo sapiens
Was LB1 perhaps a modern human with a pathologically small brain, one deformed by illness or genetic defect? No, say Falk and her colleagues. LB1's endocast indicates her brain fit snugly in her skull, and parts of her brain are highly convoluted, or intricately folded. By contrast, microcephalic brains rest loosely within the braincase and create endocasts that lack detail, like the one seen here. (Some experts, including Robert Martin of Chicago's Field Museum, say the team's sample size of one microcephalic skull was too small, and they still hold with the modern microcephalic hypothesis.)

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