The brain is the organ most complex of the human body, but for years, the available technology severely limited scientific technology of scientific interpretation severely limit the interpretation of how the billions or neutrons act together to create complex behaviors. Recent advances in recording technology of neurons, however, with the invention of the Pentium computer that can scan data at a rate much higher than ever before, led research on the brain to grow at a faster rate Fast.

By implanting elecrodes to fifty, which recorded the activity of neutrons in three different regions of the brain at the same time, the study was the first to compare whole populations of neutrons from several brain areas primates. As the monkeys performed different tasks in visual research, the research compared the activity of neurons in the parietal and frontal cortes. They found that in research trials where the issue of monkeys was looking very evident called bottom-up processing of the parietal cortex responded first, followed by the frontal cortex. In contrast, when the monkey is actively searching for the target itself down signal processing flowed in the opposite direction.