1. A method for enhancing cognition in a participant, utilizing a computing device to present visual stimuli for training, and to record responses from the participant, the method comprising: providing multiple graphical elements, and wherein the multiple graphical elements are available for visual presentation to the participant; visually presenting a temporal sequence of a plurality of the graphical elements, including displaying each graphical element in the sequence at a respective location in a visual field for a specified duration, then ceasing to display the graphical element, wherein the plurality of the graphical elements includes at least two matching graphical elements; requiring the participant to respond to the presented sequence, including indicating locations of matching graphical elements; determining whether the participant responded correctly; modifying the duration based on said determining; and repeating said visually presenting, said requiring, said determining, and said modifying one or more times in an iterative manner to improve the participant's cognition.