From a historical perspective, race psychology in its broad meaning can be divided into four overlapping periods. At the beginning stood the association of race with certain aspects of the psyche or soul. Although so-called great thinkers provided prejudicial assessments of various ethnic groups (e.g., Aristotle) or attributed psychological qualities to certain cultures and types, such as the noble savage (e.g., J.-J. Rousseau), the systematic combination of psychological characteristics with race occurred in the 18th century, when humanity was classified into distinct groups.