Visual Persistence, Dyslexia, Maths, Math, QTS Training
This Email Message from QTS Training - Offers the Opportunity to Participate in Interesting Dyslexia Research in terms of Visual Persistence
Hello - I am writing to fellow members of the Harvard ALPS 'Teaching for Understanding' forum, to ask if you could spare a few minutes to take part in our online research experiment.
We are exploring the idea that people with longer than average Visual Persistence experience more difficulties with reading (tiredness, poor comprehension and visual disturbances - letter reversals, parts of letters or words missing, etc.) than people with shorter Visual Persistence.
Visual Persistence is an interesting feature of our perceptual system. If we are exposed briefly to an isolated visual image (a letter of the alphabet for example), the image of the letter persists in our visual awareness for a period of around 40 - 250 milliseconds after the stimulus has been removed from view. When we are presented with a rapid sequence of images (such as when reading text or tracking movement) a backlog of mages can build up resulting in multiple letter images persisting simultaneously. The brain resolves this perceptual conflict by paying more attention to some images and ignoring others. In the literature, this phenomenon is called 'masking' because of the way images can be masked by both previous and subsequent images. This can result in a range of perceptual distortions which make it harder for some students to extract meaning of text.
We have found that all our dyslexic students have a visual persistence score near the high end of this natural range, and we are interested to see how visual persistence correlates to ease of reading in a range of different professions.
If you would like to take part in the experiment - this is what we would like you to do.
Click on this link www.gts-training.co.uk read the warning for anyone sensitive to flickering images, and click on the Start button which will display a cycle of letters and words. You control the speed of the display (between 20ms to 300ms) with a scroll bar. Take a note of 1) the speed at which you start to feel you are making an effort to read the display, and 2) the speed at which you start to experience visual distortions (dominant letters, greyed out letters, etc.). Stop the display, fill in and submit the short online response form.
Thank you for your attention - and please encourage others to take the test and submit a form.
We will not contact you again unless you opt to join our mailing list (an option on the response form).
John Evans
Graphical Thinking Skills
The Visual Persistence tester is written in JavaScript and runs in your browser so there is no security risk to your computer or network



