Teacher training is a key element for improving any educational system. Therefore, analyzing what future teachers learn when participating in specific educational proposals is extremely important in order to adjust existing training programs and/or create new more adapted ones. In this study we try to investigate which conceptions preservice teachers have regarding students' ideas about the world through the results of a Likert questionnaire. This was implemented at the beginning and at the end of a socioconstructivist training proposal and was designed specifically to learn about different curricular elements through practical professional problems and innovative practices. Our results indicate that, at the beginning of the course, preservice teachers agree with those conceptions of misconceptions that are close to an inquiry based learning model, however they don't reject absolutely less constructivist propositions that are close to a teacher-centered model. On the other side, at the end of the course these conceptions change; we have found an increase in the level of agreement with alternative models, while the level of disagreement with a teacher-centered model keep declining, vanishing some of the doubts preservice teachers had at the beginning of the course.