The observation that drugs could mimic the effects of nerve stimulation was ... did not believe that chemical transmission was rapid enough to account for impulse transmission in the brain.

(1) A nerve impulse arrives. (2) This causes calcium ion channels to open, resulting in an influx of calcium ions in the terminal. (3) This causes synaptic vesicles to fuse with the terminal ...

He continues to "see" the light, because the optic nerve is still transmitting impulses to the brain ... about the natural laws which govern the transmission of messages from the eyes to the ...