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Neural Organoids: How Should We Handle the Possibility of Sentience?
Søren Holm1,2, Jonathan Lewis3
1Centre for Social Ethics and Policy, https://ror.org/027m9bs27The University of Manchester, UK.
Summary
Neural organoids (NOs) are not currently sentient, lacking key features for consciousness. Ethical restrictions on NO research are unwarranted until empirical evidence of potential sentience emerges.
Area of Science:
- Neuroscience
- Developmental Biology
- Bioethics
Background:
- Pluripotent stem cell-derived neural organoids (NOs) raise ethical concerns regarding potential sentience.
- Debate centers on whether NOs could develop or already possess sentience.
Purpose of the Study:
- To critically assess arguments for potential NO sentience.
- To establish a principled framework for evaluating NO sentience and guiding ethical considerations.
Main Methods:
- Analysis of three lines of argument for NO sentience: analogy, neural function inference, and philosophical commitments.
- Evaluation of current NO capabilities against criteria for sentience and consciousness theories.
Main Results:
- Cortical organoids lack necessary structures (nociceptors, sensory integration) for analogical arguments.
- Existing neural metrics are unreliable due to insufficient structural differentiation in NOs.
- Current technological limitations (size, complexity, vascularization) prevent NOs from reaching a threshold for potential valenced experience.
Conclusions:
- Precautionary ethical restrictions on NO research are not justified by current evidence.
- A non-trivial empirical likelihood of valenced experience is required for regulatory action.
- The current state of NO development does not meet the threshold for sentience, making near-to-medium term concerns unlikely.
