How a biological brain came to exist
Secrets of the Brain asks how evolution produced the organ responsible for human thought. Presented by theoretical physicist Jim Al-Khalili, the BBC series connects the history of brains with changes in the planet, the pressures of survival and the development of social life. Its subject is the origin of our cognitive capacities as much as the workings of an individual brain.
The first chapter travels across hundreds of millions of years of evolution, tracing increasingly complex nervous systems from simpler beginnings. Fossil evidence provides one route into that history: a BBC companion clip examines a small feature on the skull of Morganucodon and what it suggests about the evolutionary foundations of the human brain.
Primates, relationships and the limits of imitation
The second chapter examines how primates deal with survival challenges and how relationships helped shape intelligence. Al-Khalili also investigates social bonds with his wife. A filmed test with chimpanzees at Edinburgh Zoo provides a concrete example of the series comparing human expectations with the cognitive abilities of other animals.
Scans, fossils and research into behaviour bring different kinds of evidence to the question of what makes biological brains distinctive. The programme extends that enquiry to artificial intelligence, asking why reproducing brain-like capacities is difficult even as AI systems become more capable.