Example methods, systems, apparatus and machine readable media are disclosed to identify candidate media events for modification. An example method includes dividing a media instance into components and correlating physiological response data from a subject exposed to the media with the components to form correlated data. The example method also includes processing the correlated data to identify transitions representative of changes in a subject response. The example method also includes parsing the components a plurality of events based on the transitions. In addition, the example method includes identifying events of the plurality of events as candidates for modification based on the changes in the subject response.