It, Imagine It - It's
The Same To Your Brain
and actually seeing it are virtually one and the same to the brain,
researchers said. They said the same parts of the brain light
up when a person thinks of a face or a scene as when the same
person actually looks at a photograph of the same face or place.
And, the team at the Massachusetts Institute of Technology reports,
they can tell, with 85% accuracy, whether a person is thinking
of a face or a place, just by looking at how his or her brain
use some of the same brain machinery when we actively see and
when we simply imagine," Nancy Kanwisher, associate professor
of brain and cognitive sciences at MIT, said in a statement.
Writing in the Journal of Cognitive Neuroscience, Kanwisher and
Kathleen O'Craven of the Rotman Research Institute in Toronto,
Canada said they used functional magnetic resonance imaging (fMRI)
to look at the brains of volunteers.
FMRI allows researchers to see blood flow and activity in various
parts of the brain in real time.
findings strengthen evidence that imagery and perception share
common processing mechanisms and demonstrate that the specific
brain regions activated during mental imagery depend on the content
of the visual image," the researchers wrote in their report.
Kanwisher and colleagues had, in previous studies, identified
a part of the brain's cortex called the parahippocampal place
area that responded strongly to images of indoor and outdoor spaces,
but not at all to faces.
In their latest study they concentrated on these two areas as
they asked volunteers to look at photographs of places or faces
and then to later create, with their eyes closed, a mental image
of the same faces and scenes.
The fMRI images "reveal a striking similarity between regions
activated during imagery and those activated during perception,"
Finally, the researchers checked to see if, simply by looking
at the fMRIs, they could tell whether a person was thinking of
a face or a place, and found they were correct 85% of the time.
- More articles
on the Brain