The human brain is a most complicated structure. Though it weights about three pounds, it is composed of more than ten billion neurons, each of which makes more than five thousand connections with other neurons. That allows for something on the order of a hundred trillion synaptic connections. These connections seem to produce sensation, motor activity, autonomic control, thought, memory, learning, emotion, and the mysterious phenomenon called consciousness. We students of the neurosciences seek to learn more about this magnificent structure by examining the brain from every possible direction. In this issue of The Harvard BRAIN, a number of essays, written by students at Harvard College, demonstrate the breadth of neuroscientific investigation. The opening pages introduce the new interdisciplinary insights of the Mind, Brain, and Behavior Initiative. There are features that will provide you with a new perspective on the biological basis of sign language, left-handedness, and suicide. We have pieces that address challenging questions in neuroscience like the binding problem, consciousness, and the evolution of primate intelligence. We hope you enjoy our publication.

Amy Herman, Editor


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