Abstract: A system according to the present disclosure presents content to a user and provides feedback to a content provider without requiring the viewer to explicitly take action. A content presentation unit, such as a digital picture frame or public display, may be any device that continuously and/or sequentially displays graphical, audio and other presentations that may be sensed by a user, generally without intervention by the user. The unit may include sensors that detect when a human expresses interest in specific content, and in various embodiments, determines a type of emotional response experienced by the user regarding the content. Particular sensors may include eye-contact, touch, motion and voice, though other sensors may also be used. The response information can be combined to provide feedback to the content provider that the content was experienced, and may determine various data, such as the duration of attention to the content and any detected emotional response to it.