Thirty patients with chorioretinitis and positive Sabin-Feldman dye test were studied concerning their neurologic aspects. There were no striking abnormalities in neurologic examination and skull X-rays. Otherwise electroencephalographic studies indicate that 73.4% of the 30 patients showed some degree of abnormalities. The most frequent changes consisted of paroxysmal sharp waves patterns, diffuse desorganization changes and as-symetrical brain waves activities. It should be emphasized the high incidence of electroencephalographic abnormalities in patients with toxoplasmosis.