1. A method for enhancing cognition in a participant, utilizing a computing device to present visual stimuli for training, and to receive responses from the participant, the method comprising: providing one or more scenes, each having a background and at least one foreground object, wherein the one or more scenes are available for visual presentation to the participant; visually presenting a scene from the one or more scenes to the participant, wherein said visually presenting comprises visually presenting the at least one foreground object and/or the background with a specified visual emphasis that visually distinguishes the at least one foreground object with respect to the background; requiring the participant to respond to the scene; determining whether the participant responded correctly; and repeating said visually presenting, said requiring, and said determining one or more times in an iterative manner to improve the participant's cognition.