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    The empirical claim that all bodily matter is replaced ev... — Carmelics
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    Challenges→Personal identity cannot consist of physical matter

    The empirical claim that all bodily matter is replaced every seven to fourteen years is a simplification that does not hold for neurons, which largely persist for a lifetime.

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    1 reason for
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    Reasons For

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    Reason for
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    • 1.Neurons lack centrioles and divide rarely in adults, making cellular replacement impossible for most brain cells.
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    • 2.Memory and identity depend on stable neural connections; wholesale neuron replacement would disrupt continuous consciousness.
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    • 3.The seven-year claim lacks rigorous empirical support and oversimplifies cell turnover rates across tissues.
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    Reasons Against

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    Reason against
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    • 1.Even 'persistent' neurons undergo continuous protein synthesis and organelle replacement at subcellular levels.
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    • 2.Some neurogenesis occurs throughout adult life in hippocampus and olfactory bulb, contradicting 'largely persist' claim.
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    • 3.The claim conflates molecular replacement with cellular identity, obscuring what 'same neuron' actually means.
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    Connections

    1 linked claim · 1 topic

    Personal Identity1 linked
    Personal identity cannot consist of physical matter

    Related

    Even 'persistent' neurons undergo continuous protein synthesis and organelle rep...Memory and identity depend on stable neural connections; wholesale neuron replac...Neurons lack centrioles and divide rarely in adults, making cellular replacement...Personal identity cannot consist of physical matter
    +3 moreShow less
    Some neurogenesis occurs throughout adult life in hippocampus and olfactory bulb...The claim conflates molecular replacement with cellular identity, obscuring what...The seven-year claim lacks rigorous empirical support and oversimplifies cell tu...

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    2 (1 for, 1 against)
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