Hi,
Although each clip contains several potential hazard only the one that materializes into a real hazard (one clip will have 2 hazards) and involves other road users is marked. This is known as a “developing hazard”. Therefore you will only receive a score if you spot a hazard before it fully materializes and is brought about by the action of another road user. In a few instances it is difficult to determine when a potential hazard becomes a developing hazard and therefore when the scoring window should start.
This is why it is safer to click a few times as you see a hazard develop to make sure you don’t click too early and miss the opening of this window.
But if you made lots of unnecessary responses in a very short space of time, or throughout the clip, that will score a zero for that clip.
For more information visit:
http://www.theory-tes...d_perception_info.asp
Hope this will help.
Best of luck for the exam