A user may be exposed to multiple token instances representing stimuli that may influence the affective state of the user. Described herein are embodiments of systems, method, and computer programs for estimating affective response to a token instance of interest, selected from among the token instances. The token instance of interest is selected based on attention levels computed utilizing a model for predicting interest in token instances. In one example embodiment, the token instance of interest is a token instance for which attention level of the user is higher than at least one other token instance.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A system configured to utilize predicted attention levels to estimate affective response to a token instance of interest, comprising: a memory configured to store: a total affective response of a user to token instances to which the user was exposed and representations of first and second attention levels in respective first and second token instances from among the token instances; wherein the first and second attention levels are computed utilizing a model for predicting interest in token instances; wherein the first and second token instances have overlapping instantiation periods; and wherein the first attention level is greater than the second attention level; a processor configured to select, based on the representations of the first and second attention levels, the first token instance as the token instance of interest; and the processor is further configured to estimate the affective response to the token instance of interest from the total affective response. 2. The system of claim 1, wherein the total affective response is based, at least in part, on a value of a user measurement channel of the user. 3. The system of claim 1, wherein the first and second token instances are visual token instances, and the model for predicting interest in token instances comprises an algorithm for prediction of interest in images. 4. The system of claim 1, wherein the first and second attention levels are computed utilizing a machine learning-based predictor that utilizes the model to predict interest levels in token instances; wherein the predictor is trained on data comprising attention levels of the user to token instances to which the user was previously exposed. 5. The system of claim 1, wherein the model comprises predictions of interest of other users in the first and second token instances, and the first and second attention levels are computed by combining the predictions using a machine learning-based collaborative filtering approach. 6. The system of claim 1, wherein the total affective response is expressed as an emotional response. 7. The system of claim 1, wherein the total affective response is expressed as a value of a user measurement channel of the user. 8. The system of claim 1, wherein the total affective response is proportional to the difference between affective responses of the user before and after the user was exposed to the token instances. 9. The system of claim 1, wherein the memory is further configured to store a baseline value for affective response of the user, and the processor is further configured to calculate the total affective response with respect to the baseline value; whereby the baseline value represents a usual affective response of the user, as computed from multiple values acquired over a period of at least a few hours. 10. The system of claim 1, wherein more than 50% of the total affective response is attributed to the affective response to the token instance of interest. 11. A method for utilizing predicted attention levels to estimate affective response to a token instance of interest, comprising: receiving a total affective response of a user to token instances to which the user was exposed; wherein the token instances comprise first and second token instances having overlapping instantiation periods; receiving representations of first and second attention levels in the first and second token instances, respectively; wherein the first and second attention levels are computed utilizing a model for predicting interest in token instances; and wherein the first attention level is greater than the second attention level; selecting, based on the representations of the first and second attention levels, the first token instance as the token instance of interest; and estimating the affective response to the token instance of interest from the total affective response. 12. The method of claim 11, wherein the first and second token instances are visual token instances, and the model for predicting interest in token instances comprises an algorithm for prediction of interest in images. 13. The method of claim 11, further comprising computing the first and second attention levels utilizing a machine learning-based predictor that utilizes the model to predict interest levels in token instances; and further comprising training the predictor on data comprising attention levels of the user to token instances to which the user was previously exposed. 14. The method of claim 11, wherein the model comprises predictions of interest of other users in the first and second token instances, and further comprising computing the first and second attention levels by combining the predictions using a machine learning-based collaborative filtering approach. 15. The method of claim 11, wherein the total affective response is proportional to the difference between affective responses of the user before and after the user was exposed to the token instances. 16. The method of claim 11, further comprising receiving a baseline value for affective response of the user, and calculating the total affective response with respect to the baseline value; whereby the baseline value represents a usual affective response of the user, as computed from multiple values acquired over a period of at least a few hours. 17. A non-transitory computer-readable medium for use in a computer to utilize predicted attention levels to estimate affective response to a token instance of interest; the computer comprises a processor, and the non-transitory computer-readable medium comprising: program code for receiving a total affective response of a user to token instances to which the user was exposed; wherein the token instances comprise first and second token instances having overlapping instantiation periods; program code for receiving representations of first and second attention levels in the first and second token instances, respectively; wherein the first and second attention levels are computed utilizing a model for predicting interest in token instances; and wherein the first attention level is greater than the second attention level; program code for selecting, based on the representations of the first and second attention levels, the first token instance as the token instance of interest; and program code for estimating the affective response to the token instance of interest from the total affective response. 18. The non-transitory computer-readable medium of claim 17, wherein the first and second token instances are visual token instances, and further comprising program for computing the first and second attention levels with an algorithm that utilizes the model for prediction of interest in images. 19. The non-transitory computer-readable medium of claim 17, further comprising program code for computing the first and second attention levels utilizing a machine learning-based predictor that utilizes the model to predict interest levels in token instances; and further comprising program code for training the predictor on data comprising attention levels of the user to token instances to which the user was previously exposed. 20. The non-transitory computer-readable medium of claim 17, wherein the model comprises predictions of interest of other users in the first and second token instances, and further comprising program code for computing the first and second attention levels by combining the predictions using a machine learning-based collaborative filtering approach.