From the 1920s to the 1950s, behavioral psychology dominated much of psychological thought, but the cognitive revolution of the 1950s revealed cracks in the theories of the radical behaviorists, and cognitive psychology eventually managed to gain the upper hand.
The heavyweight division in mixed martial arts (MMA) generally groups fighters between 205 and 265 lb (93 and 120 kg). Although many ambiguities exist within the lower weight classes regarding division naming and weight limits, the Heavyweight division is, for the most part, uniform.
In Professional boxing, the middleweight division is contested above 154 lb (70 kg) and up to 160 lb (73 kg). Early boxing history is less than exact, but the middleweight designation seems to have begun in the 1840s. In the bare-knuckle era, the first middleweight championship fight was between Tom Chandler and Dooney Harris in 1897.