There is no exact analogy for the soul-brain arrangement, but a radio wave from a broadcasting station seems close, where a wave is generated by design, and the wave travels to a receiver for translation into the sound intended for hearing; the radio/electromagnetic wave needs a receive tuned to handle the wave and translate it into sound/compression waves.
And to follow the analogy, just like injury to a radio will affect its operation but not the radio station's transmission - the injury to a physical brain will affect its operation in the body but not the soul/mind/spirit.