Figure 2.

Precision of reported phosphene location for unimanual and bimanual fixation. A. Task descriptions. Unimanual fixation (top), for which subjects fixated with their left index finger and report with their right index finger. For bimanual fixation (bottom), subjects placed both left and right index fingers on the fixation point, then reported phosphene location with their right index finger, while leaving their left index finger on the tactile fixation point. B. Precision for bimanual and unimanual fixation for BS1 (red) and BS2 (blue). Each data point reflects precision (2DRMS) for a single electrode. Error bars indicate mean and standard deviation.