Edinburgh Napier University

  The current research aimed to identify whether a model of juror decision making (i.e. the threshold model) that encompasses both rational and intuitive decision making exists. Sixty participants were selected who would be eligible for jury duty in Scotland. These individuals read nine vignettes and rated the evidence of each vignette separately by placing the evidence in either a guilty, not guilty or not proven (a verdict type specific to Scotland) counter. Participants were asked after each piece of information to state how likely they thought the suspect was of being guilty on a scale from 1 to 100. The data were best described using a flexible model (i.e., a diffusion model) that allowed for information integration. Future research should examine whether or not the diffusion model can explain cognitive fallacies, such as confirmation bias, commonly studied in decision science.