14. The method of claim 12 , wherein the first and second indications indicate confidence in predictions of emotional response to the first and second segments, respectively; whereby based on the first indication, it is determined that confidence in the prediction of the emotional response to the first segment does not reach the first predetermined threshold, and based on the second indication, it is determined that confidence in the prediction of the emotional response to the second segment does reach the second predetermined threshold.
12. A method for utilizing semantic analysis to set a measuring rate of a device that measures affective response, comprising: receiving a first indication derived from a first evaluation comprising semantic analysis of a first segment of content comprising data representing text; wherein the first evaluation comprises analysis of an aspect of a meaning of a portion of the first text; determining that the first indication indicates that a first value related to a prediction of emotional response to the first segment does not reach a first predetermined threshold, and configuring the device to measure, at a first measuring rate, affective response of a user to the first segment; receiving a second indication derived from a second evaluation comprising semantic analysis of a second segment of content comprising data representing text; wherein the second evaluation comprises analysis of an aspect of a meaning of a portion of the second text; and determining that the second indication indicates that a second value related to a prediction of emotional response to the second segment reaches a second predetermined threshold, and configuring the device to measure, at a second measuring rate, affective response of the user to the second segment; wherein while operating at the first measuring rate, the device takes at least 50% fewer measurements of affective response, per unit of measurement time, compared to measurements of affective response the device takes while operating at the second measuring rate.