The evolution of human intelligence refers to a set of theories that attempt to explain how human intelligence has evolved. These theories are closely tied to the evolution of the human brain and to the emergence of human language.
The timeline of human evolution spans approximately 7 million years, from the separation of the Pan genus until the emergence of behavioral modernity by 50,000 years ago. The first 3 million years of this timeline concern Sahelanthropus, the following 2 million concern Australopithecus and the final 2 million span the history of actual human species (the Paleolithic).
Many traits of human intelligence, such as empathy, theory of mind, mourning, ritual, and the use of symbols and tools, are already apparent in great apes although in lesser sophistication than in humans.
Famous quotes containing the words evolution of, evolution, human and/or intelligence:
“Analyze theory-building how we will, we all must start in the middle. Our conceptual firsts are middle-sized, middle-distanced objects, and our introduction to them and to everything comes midway in the cultural evolution of the race.”
—Willard Van Orman Quine (b. 1908)
“Historians will have to face the fact that natural selection determined the evolution of cultures in the same manner as it did that of species.”
—Konrad Lorenz (1903–1989)
“Not infrequently, we encounter copies of important human beings; and here, too, as in the case of paintings, most people prefer the copies to the originals.”
—Friedrich Nietzsche (1844–1900)
“But as these angels, the only halted ones
among the many who passed and repassed,
trod air as swimmers tread water, each gazing
on the angelic wings of the other,
the intelligence proper to great angels flew into their wings,
the intelligence called intellectual love....”
—Denise Levertov (b. 1923)