ABSTRACT
The human brain is the most complex object on Earth that can be studied scientifically: a collection of over 100 billion neurons squeezed into a space about the size of a grapefruit, which somehow is able to control all that you feel, do, and know. We understand rather well how the individual neurons function, how they carry information from one place to another, and how they stimulate or inhibit one another. We even have some idea of how they can analyze the incoming information and how they can organize the production of a response. In between the analyzed stimuli and the response automatons, however, is an area of profound mystery. Although prodigious amounts of data have been collected, there still is little understanding of the most important and interesting functions of the brain, such as what really happens up there when you learn something, when you are thinking, or when you are feeling happy.
