Curiosamente en SIGIA-L están discutiendo sobre el eye-tracking. Interesante leer a Jared Spool hablando sobre sus experiencias con la herramienta y NASA, poniendo algunos puntos sobre las íes.
Os copio parte del "hilo" de la conversación aquí abajo, -- Jorge Serrano Cobos Documentalista / Arquitecto de Información Departamento de Contenidos http//www.masmedios.com ------------------------------ Message: 3 Date: Mon, 09 Jan 2006 23:13:29 -0500 From: "Jared M. Spool" <[EMAIL PROTECTED]> Subject: RE: [Sigia-l] eye tracking? To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset="iso-8859-1"; format=flowed At 09:07 PM 1/9/2006, Christopher Fahey wrote: >I'm perfectly happy and eager to hear rebuttals to this skepticism, as I >have zero actual experience with the technology and techniques. Actually, Chris, I have a *ton* of experience with it and I think you're right on. As one of the early folks (maybe even the first) who looked at web usage with an eye tracker, we found it a fun toy that could really occupy a lot of our time, both in data collection and analysis. Though software has improved slightly since we first started looking at it, it hasn't solved the big issues. People think that an eye tracker measures what a user sees. In fact, it only measures what their eyes gaze at. There's a significant difference. The more we played with it, the more we realized that, because a user gazes at a design element doesn't mean they see it. We saw many instances where the user gazed straight at something for many seconds but not recall ever seeing it. One of the more interesting unexplained phenomenon was that we noticed that many users could land the mouse pointer in the scroll bar and successfully scroll *without ever gazing at the scroll controls*. Our inference was that they were attaining the scroll controls with their mouse using their peripheral vision. If this is true, that means that users actually can see things *they don't gaze at." So, if users don't see things they do gaze at and don't gaze at things they see, what does an eye tracker actually tell you? This is why you haven't seen any research from us recently on this topic. The eye tracker lets you *observe* where the gaze of the user's eye goes relative to the screen. However, it does not help with inferences. (See http://tinyurl.com/9kxou for why this distinction is important.) One of my favorite examples of poor inferences from eye tracker data is found in the Eye tools blog. (Eye tools makes software and sells a service based on that software, so they are very pro-eye tracker.) In http://tinyurl.com/7vabo , they claim that they "improved" the SFPD web site by using eye tracker data to guide their decision. Look real close at the before and after. Their inference was that people weren't looking at the navigation, so what did they do to the site? They put a mongo-big useless image in the portion of the page users *were* looking at, to force them to look at the now only useful part of the page. From their site: >The moral of the story: A change on one part of the page can impact other, >unrelated elements on the page. The right navigation bar was used >completely differently on the new re-designed website because the content >to the left of it changed. > >Is this good or bad? Ultimately, that's up to the client to decide as it >relates to the business goals of the page. However, in this case, it was >good it enabled visitors to quickly locate the specific content they wanted. Huh. They didn't measure if visitors actually locate the content they want more quickly. The only measured if people's brief eye gazes went to what they believed were the proper portion of the screen. That's quite a jump... Eye tracking can be useful for some types of measurements, but as Chris and Stewart have mentioned, it's not particularly a useful tool for day-to-day screen design. Jared Jared M. Spool, Founding Principal, User Interface Engineering 4 Lookout Lane, Unit 4d, Middleton, MA 01949 978 777-9123 [EMAIL PROTECTED] http://www.uie.com Blog: http://www.uie.com/brainsparks ------------------------------ Message: 4 Date: Tue, 10 Jan 2006 00:02:39 -0500 From: Listera <[EMAIL PROTECTED]> Subject: Re: [Sigia-l] eye tracking? To: SIGIA-L <[EMAIL PROTECTED]> Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset="US-ASCII" Jared M. Spool: > People think that an eye tracker measures what a user sees. In fact, it > only measures what their eyes gaze at. There's a significant difference. Bingo. BTW, usability folk who generally think life started in the mid-90's with the WWW ;-) may not remember that advertising and movie biz used *and* discarded eye tracking as a serious tool long time ago. ---- Ziya "Whoever controls the definition, controls the outcome." ------------------------------ Message: 5 Date: Tue, 10 Jan 2006 09:55:26 +0100 From: Gael Laurans <[EMAIL PROTECTED]> Subject: Re: [Sigia-l] eye tracking? To: [EMAIL PROTECTED] Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset=ISO-8859-1 I also have some experience with the technique and I second most of what has been said until now. I just wanted to recommend some reading on the topic if you need additional (critical) points of view (!) : http://www.cs.uta.fi/hci/mulmod/material/etusab.pdf http://www.namahn.com/resources/documents/note-eyetracking.pdf Gaël Laurans ------------------------------ Message: 11 Date: Tue, 10 Jan 2006 09:32:41 -0500 From: "Jared M. Spool" <[EMAIL PROTECTED]> Subject: Re: [Sigia-l] eye tracking? To: Listera <[EMAIL PROTECTED]> Cc: SIGIA-L <[EMAIL PROTECTED]> Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset="us-ascii"; format=flowed At 12:02 AM 1/10/2006, Listera wrote: >Jared M. Spool: > > > People think that an eye tracker measures what a user sees. In fact, it > > only measures what their eyes gaze at. There's a significant difference. > >Bingo. BTW, usability folk who generally think life started in the mid-90's >with the WWW ;-) may not remember that advertising and movie biz used *and* >discarded eye tracking as a serious tool long time ago. For the record, our eye tracking experience started in the late '80s working on Navy and Army contracts for using eye tracking is a variety of military applications, including targeting and eye strain minimization. We also did a project for NASA involving using eye tracking as a method of heads up display cursor control in a space-suit based computer. (How do you read your repair manual when you're fixing the outside of your space station?) Advertising still uses eye trackers regularly (there are useful things you can learn) as do new interactive technologies. The devices themselves are not problematic. It's the interpretation of the results that gets people into trouble. Jared Jared M. Spool, Founding Principal, User Interface Engineering 4 Lookout Lane, Unit 4d, Middleton, MA 01949 978 777-9123 [EMAIL PROTECTED] http://www.uie.com Blog: http://www.uie.com/brainsparks ------------------------------ -- Jorge Serrano Cobos Documentalista / Arquitecto de Información Departamento de Contenidos http//www.masmedios.com Miembro del Grupo Thinkepi http://www.thinkepi.net Web personal: http://trucosdegoogle.blogspot.com _______________________________________________ altas, bajas y modificaciones: http://www.cadius.org/lista/opciones.html
