Additional Study Information: Have you been treated for Lyme Disease but continue to have brain fog or other cognitive problems? This research study will assess a non-medication non-invasive intervention to improve cognitive functioning in people with persistent cognitive problems despite prior antibiotic treatment for Lyme Disease. Participants will complete this 4 week intervention at home, with up to 4 in person visits to our research center in New York City before and after the treatment period. Mood and other clinical rating questionnaires will be completed at several time points online. The intervention will consist of computerized cognitive training tasks that are completed while wearing a device to administer mild electrical stimulation to the scalp. This device is called transcranial direct current stimulation (tDCS) which has been shown to increase processing speed, reduce fatigue, and improve mood in other medicalconditions.