When is the flash on and when is it off in these plot? What would these plots look like in a control subject? Does the subject have any other indication of whe

When is the flash on and when is it off in these plot? What would these plots look like in a control subject? Does the subject have any other indication of when the flashes are occurring? I know that this isn't written to be read critically, but I don't know what the take-away is.