1. A system configured to reduce volume of transmissions of measurements of affective response, comprising: an interaction analyzer configured to receive a description of an interaction of a user with a media controller that controls progression of presentation of content consumed by the user; a measuring module comprising a sensor configured to take measurements of affective response of the user while the user consumes the content; the interaction analyzer is further configured to analyze the description in order to identify an action, performed by the user, which causes a deviation from a typical progression of presentation of the content, and to forward an indication of the action to a window selector; whereby the typical progression is a progression that would have occurred had the action not taken place; the window selector is configured to select, based on the indication, a window during which the user expressed an affective response related to the action; wherein the window starts before the action is taken and ends at most one second after the action is taken; a transmitter configured to send a request to the measuring module to transmit measurements taken by the sensor during the window; and the measuring module further comprises a transceiver configured to transmit the measurements taken by the sensor during the window.