Speed and accuracy in a visual motion discrimination task as performed   by rats
  We find that rats, like primates and humans, perform better on the random dot motion task when they take more time to respond. We provide evidence that this improvement is due to stimulus integration. Rats increase their response latency modestly as a function of trial difficulty. Rats can modulate response latency more strongly on a trial by trial basis, apparently on the basis of reward-related parameters. 
Pamela Reinagel, Emily Mankin, and Adam Calhoun
q-bio.NC