e.p.a. had "no justification" t continued use of chlorpyrifos "in the face of scientific evidence that its residue on foodcauses neuro-developmental damage to children." chlorpyrifos and otheros organophates are neurotoxins, a poison that attacks the nervous system. >> it causes a huge excitatory burst in the nervous sysm. >> o'brien: robert sapolsky is a professor of neuroscience at stanford university. the burst of nerve firing can be so severe it works the neurons to death. the body's response:ervous system tries to repair itself, by growing new connections to patch the damaged circui >> one of the things that sometimes happens is, the wirinh goes sort wire and a neuron will wind up coming backt anulating itself. so that every time it fires, it stimulates itself and it fires, and it fires-- and what you've now set up with a positive feedback loop, like this is a chronic seizure disorder. >> o'brien: first introduced as an insecticide in 1965, chlorpyrifos was sold to consumers for home andarden use under various brand names, including "raid." >> hello. good-bye. it really kills them dead. >> o'brien: i