There is some older work on this. It describes some of the methodology and approaches. However, some of the older work looks at CRT vs. LCD screen. I would look at:

Dillon, A., McKnight, C. and Richardson, J. (1988) Reading from paper versus reading from screens. The Computer Journal, 31(5), 457-464., which can be found at https://www.ischool.utexas.edu/~adillon/Journals/Paper%20vs%20screens.htm

There is also a good review article at: https://www.ischool.utexas.edu/~adillon/Journals/Reading.htm

You might also want to look at the work on Otero and Kintsch. They introduced contradictions into texts to see if they were detected as well as tested comprehension:

Otero, J., & Kintsch, W. (1992). Failures to detect contradictions in a text: What readers believe versus what they read. Psychological Science, 3, 229-235.

Dear Mr Foltz,

Thank you so much for your answer and links included.

(at last! Some good papers available on line!)

The papers have really helped me to work some things out and to find answers for some important questions I had.

I really found them interesting and very much enjoyed reading as well.

I would like to share an other interesting article I found at: http://firstmonday.org/ojs/index.php/fm/article/view/3340/2985

Once again, thank you.

You might also read the following paper 'Summarizing digital documents: effects of alternate or simultaneous window display" I published some years ago. In that paper we looked at reading and noting with simultaneous of alternate windows.

The paper is available on my RG account.

Dear Mr Olive,

First of all, let me thank you for your answer. This whole process, trying to design and conduct a research is totally new to me, so I really appreciate your help. It's a relief to finally discover papers related to the topic I am interested in!

However, for some reason I can't explain, finding the paper you mention has proved to be impossible here in RG. Are you certain it is still available on your RG account?

I found the abstract, appearing in [ http://onlinelibrary.wiley.com/doi/10.1002/acp.1380/abstract ] but it seems I can't have access to the whole paper without purchasing. Therefore, I would greatly appreciate it if you could point out where I can find your paper available for reading.

Thank you in advance.

Dear Maria,

I added the paper on my RG page.

About text memory, we investigated visual memory of texts by looking at memory for word location ; have a look to my paper with N. Le Bigot.

Coming back to your study, what is your research question? Which hypothesis do you want to test about reading on screen?

Have you got electronic/digital text types? 

https://www.researchgate.net/publication/270575717_LA_INFLUENCIA_DE_LAS_TIC_EN_LA_FORMA_DE_LEER_TIPOLOGIA_DE_TEXTOS_DIGITALES

Article LA INFLUENCIA DE LAS TIC EN LA FORMA DE LEER: TIPOLOGÍA DE T...