From Bryn Glover, Kirkby Malzeard, North Yorkshire, UK
Alex Pearlman says that the chance of a “mini-brain” grown in a lab being sentient in a human way is slim (5 May, p 26). But how can anyone know that? I am sentient and I can tell you that I am so because my brain is connected to devices that enable it to communicate with its environment. Mini-brains made of living human brain cells have no such connections and therefore no such ability to communicate – but to infer from this that they do not have awareness is surely an unacceptable leap.
