UK policy-makers are increasingly turning to neuroscience to help shape crucial laws and social policies, but experts are cautioning that the science is simply not yet robust enough for such applications. Decisions ranging from the legal age of adulthood to the nuanced categorisation of conditions like autism are being influenced by a desire to use brain science, despite significant limitations in current understanding.
One prominent area of discussion involves the legal age of adulthood. While this varies globally from 16 to 21, some advocate for using typical brain maturity levels, potentially ascertained via brain imaging, to inform policies on criminal sentencing or the right to drive. The popular notion that brains do not fully develop until the age of 25 is, however, considered an oversimplification by specialists. Brains mature at diverse rates, and there are numerous ways to measure their development, making a single, universally applicable neurological benchmark for adulthood complex and potentially misleading.
Similarly, in the realm of health policy, neuroscience is being explored for defining conditions such as autism. A recently proposed category of “profound autism” aims to identify individuals with the highest support needs, based on assessments of IQ, language skills, and care requirements. While this could potentially aid in advocating for enhanced services, critics fear it might exclude individuals who do not precisely meet strict criteria or inaccurately group together people with distinct neurological profiles, such as those with speech difficulties alongside those with cognitive impairments, who require different forms of support.
Concerns also extend to the application of psychological profiling in legal settings. The use of psychopathy as a mitigating factor in some court cases has, at times, complicated proceedings. Presenting such conditions as definitive scientific facts rather than evolving frameworks is seen as risky, given that recent research suggests that while potentially legally relevant, these assessments cannot yet be used with absolute confidence in judicial decisions.
While the aspiration to use neuroscience to provide precise insights into an individual's cognitive state is understandable, and a future where this is possible may eventually materialise, experts stress that the current scientific understanding and tools are not yet sufficiently advanced to reliably dictate public policy and legal frameworks.