Does paying attention to something always involve cognition (active thinking)?

This assignment requires that you answer the following questions based on the peer-reviewed article “Changing What you see by Changing what you know: The Role of Attention.
Based on the article, and textbook readings, answer the following questions in a written format. You may use Google docs or Word for this, but the paper must be uploaded to Blackboard in a Microsoft Word file or pdf file. If using Google docs you MUST convert the file to one of the above acceptable files.
Your paper will include a title page, a minimum of two pages of written text, and a Reference page. On the Reference page you will list the citation for the article and for your textbook using APA style citations. Google “Purdue Owl” for instructions on APA style. I will be posting a sample paper for comparison. The content of the sample paper is NOT relevant, but your paper should look like the sample in form and structure. Use Times New Roman or Arial 12 pt font and double space.

What we know influences what we see.
Does paying attention to something always involve cognition (active thinking)?
Does Attention really affect what we see?
Can the same physical input (what we actually see) be perceived differently depending on the cognitive state (thinking) of the perceiver (you)? For example, see the various illusions in the article.

From your textbook reading, what factor played the biggest role affecting the results of Change Blindness experiments?