analyzing {HEAD ~ physiological data} from a plurality of viewers exposed to media to define {TAIL ~ a plurality} of events in the media and to derive a plurality of physiological response dimensions from the physiological data for the plurality events 
to define
analyzing { HEAD ~ physiological data } from a plurality of viewers exposed to media to define { TAIL ~ a plurality } of events in the media and to derive a plurality of physiological response dimensions from the physiological data for the plurality events
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH