Inserting Gridlines

[new_horizon]

Hi All,

I am working on a vehicle detection task whereby participants are required to watch a number of vehicles move within a scene and then click in the location where they felt that they saw them move.

Is there any way of adding gridlines over the main field of vision after the objects have disappeared, so that they can select the "zone" where they felt a vehicle was moving?

I can then use the coordinates to decide whether there response was correct.

Best,

Mark