Alfred Yarbus Centenary: Tracking Eye Movement

An intriguing piece on the history of eye movement tracking technologies, via the work of Alfred Yarbus, written by Tim Holmes:

" ... These days, we take the ability to track eye-movements and then use them to gain insight into cognitive processes for granted – or at least, most of the people I meet on a daily basis do! But of course, it wasn't always like this. Yes, the technology advances mean that accessibility to the methodologies has become easier and cheaper and the fine-tuned, high frequency recordings we can obtain today provide access to a range of measures that were unavailable in the early days of the science, but in fact the basic principles of tracking eye-movements and visualising those results hasn't changed that much over my lifetime.  .... "