From PhilPapers forum Philosophy of Mind:

2011-10-06
The time-lag argument for the representational theory of perception
Reply to George Evans
Here is an interesting addition to the Time Lag Debate, a NEGATIVE time lag in which, when subjects are trained to press a button to create an event the timings between the button press and the event can be varied so that the subjects perceive the event to occur before the press of the button!

How would a Direct Realist explain this?

See SENSORIMOTOR ADAPTATION TO VIOLATIONS OF TEMPORAL CONTIGUITY
Douglas W. Cunningham,1,2 Vincent A. Billock,2 and Brian H. Tsou3
Psychological Science VOL. 12, NO. 6, NOVEMBER 2001