One area of study that today is experiencing exciting and radical discoveries is neuroscience, with recent new work questioning some very strongly rooted ideas about consciousness, the brain and such like. Ignacio Morgado is one of Spain’s most acclaimed neuroscientists and the author of a number of books of popular science. The most recent is Materia gris (2021), which offers a history of research into and ideas about the mind and the brain, touching on some of the great philosophers of history as well as covering the most recent discoveries by biologists and anatomists. The result is a fascinating look at the subject, from ancient to modern times, offering one of the most complete books about the current debate within the neurosciences. In conversation with the BBC journalist Lucía Blasco.