Changes in detection threshold with a contralateral change in background luminance.

<p>Performance as a function of the grating contrast, separately for saccade (solid lines) and fixation (dashed lines) conditions, and for the two background luminance conditions. The red curves correspond to the 60/20 condition while the blue curves correspond to the 20/20 condition. Error bars show 95% confidence intervals. An increase in contralateral background luminance did not affect performance during fixation, but it significantly increased the detection threshold for pre-saccadic gratings.