• A critical review of the support for variability as an operant dimension 

      Nergaard, Siv Kristin; Holth, Per (Perspectives on Behavior Science;43 (3), Journal article; Peer reviewed, 2020-07-27)
      There is abundant evidence that behavioral variability is more predominant when reinforcement is contingent on it than when it is not, and the interpretation of direct reinforcement of variability suggested by Page and ...