CELLULAR INTELLIGENCE

 A

Key Points & Philosophical Tensions

• The Slime Mould (Physarum polycephalum): A brainless, single-celled organism (syncytium with multiple nuclei) capable of navigating mazes, optimizing complex transport networks (e.g., replicating the Tokyo subway system), storing environmental memory via slime trails, and learning temporal patterns without neurons.
  
  
• The Core Debate:
  
  
  • The "Biogenic" Camp (Levin, Lyon, Nakagaki, Glanzman): Asserts that cognition, memory, and intelligence are continuous spectrums intrinsic to all biological life (plants, microbes, individual cells), rather than exclusive to neuronal structures.
    
    
  • The "Neuropurist" Camp (Taiz, Kacelnik, Pringle): Argues that applying human cognitive terminology ("intelligence," "memory," "decision-making") to brainless organisms dilutes scientific precision, anthropomorphizes natural processes, and misleads the public.
    
    
• Redefining Memory: Experiments on Aplysia sea slugs by David Glanzman suggest memory might be stored within cellular RNA/epigenetic mechanisms rather than exclusively in neuronal synapses, providing evidence for non-neuronal memory.
  
  
• Linguistic & Conceptual Limitations: The debate underscores a fundamental conflict over scientific terminology—whether existing terms like "cognition" should be broadened to incorporate basic cellular processing or preserved exclusively for neural architecture.
  
  

Comparative Philosophical Stances

Perspective	Core Assumption	Stance on Non-Animal Cognition	Key Risk Identified
Neuropurist Consensus	Cognition requires complex neural networks and internal representational models.	Behaviour in brainless organisms is strictly physical, chemical, and algorithmic reaction—not "intelligence."	Anthropomorphism: Trivializes human cognition and imposes human paradigms onto non-human life.
Biogenic Framework	Evolution is a continuum; cellular information-processing preceded the emergence of neurons.	Every living cell processes information, learns, and exhibits primitive forms of cognition.	Semantics / Vitalism: Risk of blurring distinct scientific categories or invoking metaphysical concepts.

Key Arguments from Named Contributors

• Toshiyuki Nakagaki: Pioneered maze-solving and network-optimization experiments; suggested that non-neuronal problem-solving challenges existing definitions of intelligence.
  
  
• Michael Levin: Argues that cognition is "all the way down" to molecular networks; claims that refusing to recognize cellular intelligence stems from an arbitrary, human-centric bias.
  
  
• Alex Kacelnik: Warns against expanding terms like "cognition" to cover basic biological responses, arguing it strips words of functional meaning.
  
  
• Anne Pringle: Questions human arrogance in viewing efficiency or maze-solving through human values, noting that slime moulds expand everywhere first before pruning back useless paths.
  
  
• Pamela Lyon: Positions the expanding definition of non-human cognition as a incoming "Copernican revolution" that dethrones humanity as the sole apex of intelligence.