This type of eye tracker is fairly expensive but
before we reach the end of this lecture, we're going to talk about some cheaper
alternatives that are already out there and that are becoming more reliable and
cheaper for people who may want to use this technique.
The second thing that I'm going to say is that eye tracking has some really
interesting properties.
And one of them is that people move their eyes in interesting and,
in some cases, predictable ways, depending on what they're doing.
A classical example of this is,
if you give somebody a hard problem to think about, their eyes look up.
I don't think we completely understand why, but we recognize this.
And one of the results of that is, as best we can whenever we're doing eye tracking,
we try to have somebody in a comfortable position, in as natural a setting for
carrying out a task as possible, because if we
make things artificial we may mess up the pattern in which people look at things.
And so, when you've seen us in the lab before,
we've done think aloud protocols where we've asked people to tell us what they're
doing, what decisions they're making.
What you're going to see today is going to be a lot more quiet.
We're going to watch what's going on, and we're going to interpret through the lens
of watching, not primarily through the lens of asking.
So with that, we're going to start with a process known as calibration.
And let's take it away with our calibration step.
>> Okay, sounds good.
Hi Lauren, I'm going to be working with you today, and
I'm going to start by getting you calibrated on our eye tracking monitor.
It's going to be fairly simple from your side.
I'd like you to begin by sitting comfortably,
like you ordinarily would using the computer.
>> All right. >> With your hands comfortably at
the keyboard so we get the right distance away.
>> Good. >> Is the display a comfortable distance
from you when you're seated that way?
>> Yes it is.
>> Okay. Thanks.
In that case, I'm going to make sure we got you in the window.
And it looks like I'm going to budge this down a little bit.
>> All right.
>> Just looking at some stuff on my side.