Libby Rozbruch is a junior at the University of Pennsylvania studying Psychology.
Over the past decade, scientists have been exploring the potential of functional magnetic resonance imaging (fMRI) as a method for lie detection. fMRI measures small, variable changes in the ratio of oxygenated blood to deoxygenated blood during a particular task or when a particular stimulus is presented. When a specific area of the brain is active, there is a local increase in oxygen-rich blood. In turn, fMRI allows scientists to assess and identify increased activity in brain regions associated with the cognitive processes required for lying.  The question is – should information acquired from this type of brain imaging technology be used as evidence in the courtroom?