The secret life of bacteria - small, smart and thoughtful! [Highlight from the archive]The secret life of bacteria - small, smart and thoughtful! [Highlight from the archive]
All In The Mind
We can't survive without them -- and we've long underestimated their prowess. Controversially, bacteria could even have cognitive talents that rival our own. Predatory behaviour, cooperation, memory -- Jules Verne eat your heart out -- Natasha Mitchell takes you on a strange adventure into the secret world of microbial mentality.
30:08•7 Nov 2009
Small, Smart and Thoughtful: Rethinking Minds Through Bacteria
Episode Overview
- Bacteria sense, remember and respond to their surroundings in ways some scientists describe as cognitive or intelligent.
- Microbial communities form complex biofilms that function like three-dimensional cities with division of labour.
- Bacteria communicate using chemical signals and physical contact, coordinating group behaviour that single cells cannot achieve alone.
- Structures dubbed "nanobrains" allow bacteria to process large amounts of sensory information and control movement.
- Questioning human-centred ideas of mind can change how we see our connection to other living things, right down to microbes.
“The real question is why they wouldn't be the most sophisticated, intelligent organism on earth.”
What can we learn about thinking from creatures that don’t even have a brain? This highlight from the All In The Mind archive takes you on a microscopic detour, where bacteria steal the spotlight from humans. Host Natasha Mitchell sets the scene with poetry, history and a cheeky sense of humour, before handing the mic to scientists who suggest that bacteria might be “small, smart and thoughtful” in their own way.
You’ll hear microbiologists and philosophers question the old idea that complex minds only belong to big-brained animals. Philosopher Dr Pamela Lyon explains how debates over where cognition begins pushed her all the way down to single-celled organisms. Expect plenty of surprises as she describes bacteria that “hunt in packs”, share genes, and form social groups with sentinels and clan-like behaviour. Her question is simple but unsettling: if bacteria sense, remember and make choices, how different are they from us?
Microbiologists Professor James Shapiro and Professor Geoffrey Stock add lab-based detail, talking about bacteria that communicate with chemicals, form 3D "cities" called biofilms and even have what Stock calls a "nanobrain" for processing huge amounts of information each second. As one of them puts it, “they behave intelligently with respect to their environment” – which forces a rethink of what intelligence really is. The tone is playful but rigorous, mixing archival readings, quirky poems and sci‑fi‑tinged speculation with hard science.
Anyone interested in consciousness, mental health, or how we define “mind” will find plenty to chew on. It’s especially relevant if you’re reflecting on what makes humans special while rebuilding life in recovery; this episode gently asks whether we’re less separate from the rest of life than we like to think. Ready to have your idea of intelligence shrunk down to bacterial size?
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