. . . . . . "Der Einfluss transkranieller Gleichstromstimulation des visuellen Kortex auf die Kontrastwahrnehmung in der Schwellenwertperimetrie" . "The influence of transcranial direct current stimulation of the visual cortex on contrast detection measured by threshold perimetry" . . . "Influence of transcranial direct current stimulation of the visual cortex on contrast detection measured by threshold perimetry" .