“…An extensive literature review has concluded that involvement of the central nervous system in the chronic form of CD is oligo or asymptomatic [9]. Electroencephalographic (EEG) studies in patients with the chronic form of Chagas' disease [10,11] are scanty and the findings are unspecific. Recently, quantitative electroencephalogram (EEG) and event-related potentials have revealed alterations in all frequency bands -mainly the lower alpha and beta1 relative power, and higher theta and delta relative powerand have increased P300 latency, respectively [12].…”