The project starts from the conceptual or philosophical basis of pseudoscience (metacriterion and demarcation criterion), developing a demarcative tool in order to define and screen pseudoscience. The second chapter includes both an elucidation of the fourth item of the demarcation criterion and the validation of a psychometric scale for the measurement of pseudoscientific beliefs. The scale shows high reliability (Cronbach's alpha = 0.90) and two thematic subscales: pseudo-theory promotion and science denialism. Finally, the third chapter includes two studies using all these conceptual and psychometric tools in order to obtain empirical evidence to understand pseudoscience as a psychological construct. These studies compare the psychological profiles of believers in pseudoscience, the paranormal and conspiracy theories, analysing the relationships between these sets of beliefs and various dimensions of scientific literacy, as well as cognitive, personality and sociodemographic variables.
