Fig. 8.

Our proposed extension of the preexisting express saccade model whereby bright stimuli trigger early express saccades (red line) and dim stimuli trigger later express saccades (orange line). During express saccades, the merged visual and motor responses produce an elongated visual response that triggers an express saccade when this activity is accumulated and integrated. In this model early express saccades are more prevalent because bright stimuli elicit larger visual responses. A reduced proportion of late express saccades can still be triggered despite a significantly reduced visual response because of the extra buildup activity that can accumulate.