3.
阅读理解
It's common knowledge that the woman in Leonardo
da Vinci's most famous painting seems to look back at observers (观察者), following them with her eyes no matter where they stand in the
room. But this common knowledge turns out wrong.
A new study finds that the woman in the painting
is actually looking out at an angle (角度) that's 15.4 degrees off
to the observer's right—well outside of the range that people normally believe
when they think someone is looking right at them. In other words, said the
study author, Horstmann, "She's not looking at you." This is somewhat
ironic, because the entire phenomenon of a person's gaze (凝视) in a photograph or painting seeming to follow the viewer is
called the "Mona Lisa effect (效应)". That effect is
absolutely real, Horstmann said. If a person is illustrated or photographed
looking straight ahead, even people viewing the portrait from an angle will
feel they are being looked at. As long as the angle of the person's gaze is no
more than about 5 degrees off to either side, the Mona Lisa effect occurs.
This is important for human interaction with on
screen characters. If you want someone off to the right side of a room to feel
that a person on—screen is looking at him or her, you don't cut the gaze of the
character to that side—surprisingly, doing so would make an observer feel like
the character isn't looking at anyone in the room at all. Instead, you keep the
gaze straight ahead.
Horstmann and his co—author were studying this
effect for its application in the creation of artificial—intelligence avatars (虚拟头像) when Horstmann took a long look at the "Mona Lisa" and
realized she wasn't looking at him.
To make sure it wasn't just him, the researchers
asked 24 people to view images of the "Mona Lisa" on a computer
screen. They set a ruler between the viewer and the screen and asked the
participants to note which number on the ruler intersected (横切) Mona Lisa's gaze. To calculate (估测) the angle of Mona Lisa's
gaze as she looked at the viewer, they moved the ruler farther from or closer
to the screen during the study. Consistently, the researchers found,
participants judged that the woman in the "Mona Lisa" portrait was
not looking straight at them, but slightly off to their right.
So why do people repeat the belief that her eyes
seem to follow the viewer? Horstmann isn't sure. It's possible, he said, that
people have the desire to be looked at, so they think the woman is looking
straight at them. Or maybe the people who first created the term "Mona
Lisa effect" just thought it was a cool name.