Positive and negative spontaneous self-talk and performance in gymnastics : The role of contextual, personal and situational factors - Santos-Rosa, Francisco J. (University Pablo de Olavide. Department of Sports and Computer Science) ; Montero-Carretero, Carlos (University Miguel Hernández of Elche. Sports Research Centre) ; Gómez-Landero, Luis Arturo (University Pablo de Olavide. Department of Sports and Computer Science) ; Torregrossa, Miquel (Universitat Autònoma de Barcelona) ; Cervelló, Eduardo (University Miguel Hernández of Elche. Sports Research Centre)