Figure 1. Sample screenshot from comprehension training program.

The child hears a sentence such as “the hedgehog is above the boot”, and must click first on the hedgehog and then on the boot to move them into correct positions in the rocket. The question mark denotes the next position to be filled. The child can press “talk” to have the sentence repeated, and can press “help” to have visual cues added to denote which items must be moved. The format for the preposition pair “before/after” was identical except that a train was shown, and the task was to select items to fill trucks of the train in the correct horizontal order.