Abstract: Methods and systems for measuring brain function of a person are disclosed. In some embodiments, the methods include the following: providing a database including digital image files that define intersecting sinusoidal functions; conducting matching trials including displaying a first image selected from the digital image files for a first amount of time, displaying no images for a second amount of time, and displaying both the first image and a second image, prompting the person to identify the first image, recording whether the person correctly identified the first image, and recording an amount of time to complete the matching trial; and conducting recognition trials including displaying an image selected from the digital image files, prompting the person to identify whether the image was displayed in the matching trials, recording whether the person correctly identified whether the image was displayed, and recording an amount of time to complete the recognition trial.