Neuroscience (or neurobiology) is the scientific study of the nervous system.[1] It is a multidisciplinary branch of biology[2] that combines physiology, anatomy, molecular biology, developmental biology, cytology, mathematical modeling and psychology to understand the fundamental and emergent properties of neurons and neural circuits.[3][4][5][6][7] The understanding of the biological basis of learning, memory, behavior, perception, and consciousness has been described by Eric Kandel as the "ultimate challenge" of the biological sciences.[8]