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Descent of Man In this lecture, beginners can familiarize themselves with basic information and terms used to describe the evolution of humanity beginning with the origin of primates through the comings and goings of Genus Homo. |
Life on land tied to gene expansion
Posted: Thursday, February 3, 2000
(Harvard Medical School) The evolutionary transition from life in the sea to life on land may have been nudged by a genetic expansion, according to an article appearing in the February Development. HMS researchers Susan Dymecki and her colleagues suggest that a gene previously expressed in the developing brain may have come to be expressed also in the tips of developing limbs, helping to bring about the development of toes and fingers in the first vertebrates. More
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Posted: Wednesday, February 2, 2000
Researchers at the University of Toronto have discovered how the brain helps us see and interact with objects by filling in missing information, according to a study published in the June issue of Current Biology. Because most of what people see is often blocked by other objects, the visual information received by the brain is usually incomplete. "People take perception for granted because it seems so instant and automatic to us," says Allison Sekuler, associate professor of psychology at U of T and one of the study's senior authors. "What many people don't realize is that the objects we see are not necessarily the same as the information that reaches our eyes, so the brain needs to fill in those gaps of missing information." More
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