What's unclear is whether smiling reflects a person's overall happiness or if the act of smiling contributes to that happiness.
The system also inspects images to see if people are smiling or looking directly at the camera lens.
Marco Iacoboni, a lab director at the UCLA Brain Mapping Center, says when people see a smile, so-called mirror neurons fire in their brain and evoke a similar neural response as if they were smiling themselves.
The survey results are graphically compiled in the computer records Cemex now keeps of all its customers -- smiling yellow face if satisfied, frowning face if upset or less than satisfied.
And sure enough, the girls, meeting Americans for the first time, quickly stop smiling when I ask if they're enjoying the encounter.
When they turn together and head out the door to a waiting plane, we see their faces, smiling and hopeful, as if they were embarking on a great voyage of discovery.
The old man was heavy and gray-haired, with eyes narrowed and mouth slightly open, as if he were asthmatic, but he was smiling as well as he could.
If cosseted executives are moaning, Japanese consumers are smiling.
When I bent my legs and peered in, I could see his back, and the back of his head, and, across the table from him, my smiling radiant wife lifting her wineglass as if in acknowledgment of something he had said.
But portraits of grateful Palestinians smiling from USAID billboards could bear very different expressions if the funds dry up.
If he's worried he didn't look it, smiling from behind his wrap-around shades as women dressed in the Somali flag sing traditional songs of welcome.
Ordinary users fell for touches like the smiling Mac icon that came on as the computer warmed up, as if the machine was relating to you, promising to be along in a minute.
And if they take a picture of you behind the wheel, make sure you are not smiling.
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