Sentence:  The final point introduces the idea of <WSD>'algedonics</WSD>' (from the Greek 'aldos', meaning pain, and 'hedos', or pleasure), a signal produced by a statistically recognised event, which is so important that it bypasses the usual channels and gets sent directly to S5. 
Meaning of the word marked with <WSD> tags:  The handling of critical events in ways that bypass the usual chain of reporting in order to respond more urgently.