1. A method for identifying a moment of a presentation, the method comprising: displaying a presentation to a plurality of viewers; obtaining biometric data from the plurality of viewers during the displaying step; showing selections from the presentation to the viewers after the displaying step; collecting self-reported responses by each viewer regarding the viewer's memory of what the viewer's state of mind was when the viewer viewed each selection of the presentation during the displaying step; synchronizing the biometric data and the self-reported responses with the content of the presentation; training a system to correlate the biometric data obtained from the plurality of viewers with the self-reported responses obtained from the plurality of viewers; subsequently displaying the presentation to a subsequent viewer; obtaining biometric data from the subsequent viewer during the step of displaying the presentation to the subsequent viewer; identifying a time of occurrence of a state of mind of the subsequent viewer from the biometric data obtained from the subsequent viewer using the trained system; and identifying a moment of the presentation by correlating the time of occurrence of the state of mind with the presentation.