You compare an effect of a randomly applied poison to one done by the brain itself acting specifically (the early age pruning). https://en.wikipedia.org/wiki/S

You compare an effect of a randomly applied poison to one done by the brain itself acting specifically (the early age pruning). https://en.wikipedia.org/wiki/Synaptic_pruning https://en.wikipedia.org/wiki/Synaptic_pruning In any case, I see no differentiation in the previous comments between the cells, types of cells - neurons being only one type in the brain - and connections. Axons of neurons are quite substantial and are a large part of the brain mass, it isn't only about neurons at all. Glial cells are not only just "support" either. Example: https://www.simonsfoundation.org/2019/07/29/frustrated-fish-reveal-glias-computational-role-in-motivated-behavior/ https://www.simonsfoundation.org/2019/07/29/frustrated-fish-... -- or https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2894949/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2894949/