Described herein are embodiments of systems, method, and computer programs for estimating affective response to a token instance of interest utilizing a predicted affective response to a background token instance. The affective response is computed based on the difference between a measured affective response of the user and the predicted affective response. Where the measured affective response is a measurement of the affective response of the user to a simultaneous exposure to both the background token instance and the token instance of interest.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A system configured to estimate affective response of a user to a token instance of interest utilizing a predicted affective response to a background token instance, comprising: a processor configured to receive the background token instance and to predict an affective response due to exposure to the background token instance; and a decomposer configured to receive a measured affective response of the user due to simultaneous exposure to both the background token instance and the token instance of interest, and to estimate an affective response of the user to the token instance of interest based on the difference between the measured affective response and the predicted affective response. 2. The system of claim 1, wherein the processor is further configured to receive a baseline affective response value of the user, and to utilize the baseline value in the calculation of the predicted affective response. 3. The system of claim 1, wherein the predicted affective response to the background token instance is a predicted affective response of the user to the background token instance. 4. The system of claim 1, wherein the token instance of interest is a token instance, selected from among multiple token instances, for which a measured attention level of the user is the highest. 5. The system of claim 1, wherein the token instance of interest is a token instance, selected from among multiple token instances, for which a predicted attention level is the highest. 6. The system of claim 1, wherein the estimated affective response of the user to the token instance of interest is expressed as a value of an emotional response. 7. The system of claim 1, wherein the estimated affective response of the user to the token instance of interest is given in terms of a value of a user measurement channel of the user. 8. The system of claim 1, wherein the background token instance corresponds to an image generated by a computer game. 9. The system of claim 1, further comprising a machine learning-based predictor configured to predict the affective response of the user; wherein the machine learning-based predictor is trained on data collected over a period during which the user was in different situations. 10. The system of claim 1, wherein the predicted affective response due to exposure to the background token instance is calculated by selecting a machine learning-based predictor for affective response of the user appropriate to a situation the user is in, from among at least two machine learning-based predictors for affective responses of the user; wherein each machine learning-based predictor was trained on data collected over periods of time in which the user was in a situation belonging to a distinct set of situations specific to that machine learning-based predictor. 11. A method for estimating affective response of a user to a token instance of interest utilizing a predicted affective response to a background token instance, comprising: predicting an affective response due to exposure to the background token instance; receiving a measured affective response of the user due to simultaneous exposure to both the background token instance and the token instance of interest; and estimating the affective response of the user to the token instance of interest based on the difference between the measured affective response and the predicted affective response. 12. The method of claim 11, further comprising receiving a baseline affective response value of the user, and utilizing the baseline value in the calculation of the predicted response. 13. The method of claim 11, further comprising attributing a portion of the difference between the measured affective response and the predicted affective response, which is proportional to an attention level of the user to the token instance of interest. 14. The method of claim 11, further comprising selecting, from among multiple token instances, a token instance for which a measured attention level of the user is highest as the token instance of interest. 15. The method of claim 11, further comprising selecting, from among multiple token instances, a token instance for which a predicted attention level is the highest as the token instance of interest. 16. The method of claim 11, further comprising receiving a plurality of background token instances, and predicting the affective to the background token instances; wherein at least some of the background token instances have overlapping instantiation periods and the token instance of interest is not one of the background token instances. 17. A non-transitory computer-readable medium for use in a computer to estimate affective response of a user to a token instance of interest utilizing a predicted affective response to a background token instance; the computer comprising a processor, and the non-transitory computer-readable medium comprising: program code for predicting an affective response due to exposure to the background token instance; program code for receiving a measured affective response of the user due to simultaneous exposure to both the background token instance and the token instance of interest; and program code for estimating the affective response of the user to the token instance of interest based on the difference between the measured affective response and the predicted affective response. 18. The non-transitory computer-readable medium of claim 17, further comprising program code for receiving a baseline affective response value for the user and utilizing the baseline value in the calculation of the predicted affective response. 19. The non-transitory computer-readable medium of claim 17, further comprising program code for selecting, from among multiple token instances, a token instance for which a measured attention level of the user is highest as the token instance of interest. 20. The non-transitory computer-readable medium of claim 17, further comprising program code for selecting, from among multiple token instances, a token instance for which a predicted attention level is the highest as the token instance of interest.