Consciousness, Free Will, and Guilt: Cognitive Neuroscience and Criminal Responsibility in the European Legal Framework. A Narrative Review on the Implications of Neuroimaging in Assessing Mental Capacity and Criminal Intent

The intersection between neuroimaging and criminal law represents one of the most compelling challenges in contemporary jurisprudence. As brain imaging technologies advance, European courts increasingly encounter neuroscientific evidence in determining criminal responsibility and mental capacity. This narrative review systematically examines the current state of neuroimaging research relevant to criminal responsibility within European and Italian legal contexts, analyzing implications for traditional concepts of free will, moral agency, and legal culpability. Current neuroimaging research reveals complex neural networks underlying moral decision making, involving prefrontal cortex, anterior cingulate, and limbic structures. Functional magnetic resonance imaging (fMRI) studies demonstrate that damage to ventromedial prefrontal cortex impairs moral reasoning, while diffusion tensor imaging reveals white matter abnormalities in psychopathic individuals. Structural neuroimaging identifies volumetric reductions in key brain regions associated with impulse control disorders. However, significant methodological limitations constrain forensic applications, including reverse inference problems, individual variability, and insufficient predictive accuracy for legal decision-making. European courts have shown cautious receptivity to neuroimaging evidence, with notable precedents in Italy (Albertani case, 2011), Germany, and France establishing frameworks for integrating brain-based evidence with traditional legal principles. While neuroimaging provides valuable insights into brain-behavior relationships relevant to criminal responsibility, current evidence suggests it should complement rather than replace conventional forensic assessment methods. The integration requires continued interdisciplinary collaboration, enhanced training for legal professionals, and standardized protocols for forensic neuroimaging applications.