The forebrain is the most important part of the brain.
The Forebrain is considered as the highest region of the brain because it essentially differentiates us humans from the rest in the animal kingdom. This region is also involved in processing complex information. (The midbrain and hindbrain are similar with other animals, hence the term Brain Stem.) The forebrain is composed of the limbic system, the thalamus, the hypothalamus, the basal ganglia, and the cerebral cortex.