John Hawks, a professor of anthropology at the University of Wisconsin–Madison, answers:
umans are known for sporting big brains. On average, the size of
primates' brains is nearly double what is expected for mammals of the
same body size. Across nearly seven million years, the human brain has
tripled in size, with most of this growth occurring in the past two
million years.
Determining brain changes over time is tricky. We have no ancient brains
to weigh on a scale. We can, however, measure the inside of ancient
skulls, and a few rare fossils have preserved natural casts of the
interior of skulls. Both approaches to looking at early skulls give us
evidence about the volumes of ancient brains and some details about the
relative sizes of major cerebral areas. [...] scientificamerican.com/
lunes, 29 de julio de 2013
Suscribirse a:
Enviar comentarios (Atom)
No hay comentarios:
Publicar un comentario