At the beginning of the 20th century, German biologist Jakob von Uexküll
created the concept of "Umwelt" to denote the environment as experienced
by a subject. This concept of environment differs from the idea of
passive surroundings and is defined not just by physical surroundings,
but is rather a "subjective universe", a space weighted with meaning.
Today, neuroscience provides a new way to look at the brain's capability
to create a representation of the world. At the same time behavioural
specialists are demonstrating that animals have a richer mental universe
than previously known. Philosophical reflection thus finds itself with
more experimental and objective data as well. Nearly a century after the
publication of von Uexküll's founding work ("Umwelt und Innenwelt der
Tiere" was published in 1909), neurobiologists, psychologists,
sociologists, anthropologists, ethologists, and philosophers revisit his
mail concept at the light of modern science