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.
Wladimir Klitschko currently holds the WBA, IBF, WBO and Ring Magazine heavyweight championships. He has held at least a share of the heavyweight crown since an April 2006 TKO victory over Chris Byrd claimed him the IBF belt. Klitschko (58-3 51 KO) has dominated the heavyweight division since his last lossâwhich he suffered in 2004 to Lamon Brewsterâand has defended his IBF title 12 times.