The invention features methods and systems to monitor changes in the magnitude of attentional disturbance and the magnitude of motor activity disturbance in a subject. The invention also features methods and systems for determining a subject's degree of concordance with individuals having an attentional disorder versus individuals not having an attentional disorder. The methods and systems of the invention can enable clinicians and consumers to ascertain both the severity of an attentional disorder as well as how much an individual changes over time, or with therapy.