Make use of the article to answer the questions.

We usually believe what our brain tells us, but there are some amazing facts which show that the brain tricks us. As a result, we think we can see something that is not actually there or we ignore things that actually are there. Scientists Daniel Simons and Christopher Chabris have researched this phenomenon , which they call "change blindness". Their experiments show how we sometimes just do not see what is in front of our eyes because _ . Here is one of their most famous experiments. In this experiment, the participants were shown a video of two groups of people (one group in white T-shirts and one group in black T-shirts) who passed basketballs around in a hallway. Each group had three members. Simons and Chabris asked the participants to count how many times the white team passed the ball. While the two teams were passing their balls around, a person dressed up as a big bear walked through the group and stopped to look at the camera. Simons and Chabris found that about half of the research participants did not notice the big bear.

1. What occupation does Christopher Chabris have?
2. Does he share this occupation with Daniel Simons?
3. Are they chemists?
4. What phenomena do they study?
5. When studying this do they use video?
6. What activity are the people doing in their famous video?
7. Are the people wearing special clothing?
8. What?
9. How many people are in the video?
10. Are all people dressed in Tshirts?
11. What does the bear person do?
12. How many people wear tshirts?
13. How many people wear an animal costume?
14. Does the bear pause at all?
15. When people view this video, what do the scientists try to observe about the viewers?
16. Do all most people notice the bear?

Numbered answers:
1. Scientist
2. yes
3. no
4. change blindness
5. yes
6. passing basketballs
7. yes
8. one group in white T-shirts
9. Seven
10. all but one
11. walked through the group
12. Six
13. One
14. yes
15. to see if they notice the bear
16. half