Eye movements and scalar adjectives

Some sentence-processing researchers investigated the real-time comprehension of sentences that contained scalar adjectives such as tall. Participants' eye-movements were tracked while they looked at one of four visual displays and followed spoken instructions such as, "Pick up the tall glass and put it below the pitcher." The four different conditions are pictured on the next page.

1. Describe the four different conditions that you see in the pictures.
2. Consider first conditions A (top left) and B (top right). Given what you know about referential context effects, predict what differences in eye movements researchers will observe between these two conditions, focusing especially on the region "the tall glass". Explain the rationale for your predictions.
3. Next, consider conditions C (bottom left) and D (bottom right). Notice that the glass in the top-left corner is not as tall in C and D as the one in A and B. In other words, it is not as prototypical an example of something "tall". How will eye movements in these two conditions differ from those observed in A and B? Why?