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(52) US Cl................................ 725/10; 725/9; 382/118 change (up or down) of all pertinent physiological responses (58) Field of Classification Search........................ None across multiple viewers. Such rating offers an objective abil See application file for complete search history. ity to compare the strengths of events of the media, as there is a strong correlation between high coherence of physiological (56) References Cited responses (all viewers feel the same thing at the same time)