1. A computer-implemented method for a user using at least a first window of a display, with at least some of the space outside of the first window being viewable via the display, with the space outside of the first window including at least a part of another window at least partially viewable via the display, the method comprising: acquiring data, by a computing device, regarding a volitional input of the user, the data from a sensor sensing a physical attribute associated with the user, the sensor being configured to be detached from the physical attribute associated with the user to sense at least the physical attribute; analyzing the data by the computing device, which is coupled to the sensor and the display; determining by the computing device from the analyzing of the data whether the volitional input suggests the user paying attention to materials in the first window or not to materials in the first window, whereby the volitional input suggesting the user not paying attention to materials in the first window indicates a change in situation from the volitional input suggesting the user paying attention to materials in the first window; and adjusting, by the computing device, materials for presenting to the user if the determining determines that the volitional input suggests the user not paying attention to materials in the first window, wherein the sensor includes an imaging sensor.