subject: Why Your Brain Flips Over Visual Illusions [print this page] Tell me what you seeTell me what you see.
This is a great skull. No, wait, then two people in a bow. Hold on, its head again. Two different images can be seen in the picture trick Blossom and Decay (see left). Now we are one step closer to work, how the brain spontaneously turns on such views, the discovery of what may be relevant to the region of the brain.
The exact mechanism that causes brain nerve to change its view of the stage is not known, but it is believed that play an important role in perception, acting as a kind of reality check, says Ryota Kanai of the University College London. We have cause to prompt different interpretations possible, so as not to get stuck with a potentially erroneous interpretation of the world.
To find out which parts of the brain may be involved, Kanai and colleagues asked 52 volunteers to watch the video from renewable energy sphere and the press, when turnover ball to change direction. First of all, the ball is not changing direction, may be simply be seen as rotating in any direction. How long is each direction of rotation was perceived to be recorded and the average rate switch assigned to each of the volunteers.
The team then used structural magnetic resonance imaging to look for brain areas active during this task. This pointed to the superior parietal lobes(SPL), two areas toward the back of the head is known, observations and process control of three-dimensional images. People whose bark was thicker and better communication in this area was faster rate of change.
To verify that the SPL had a role in triggering the switch, the researchers stimulated each lobe of the magnetic field effectively knocking out the features of this panel while volunteers rewatched sphere illusion. The team believes that the rate slowed when the switch or the leaf was exposed to a magnetic field( Current Biology, DOI: 10.1016/j.cub.2010.07.027 ).
One possibility is that the SPL is really tripping perception of sending a signal to the reset illusion, Kanai says. And maybe that people with high SPL are better at recognizing other possible interpretations of ambiguous sphere, which is also faster to change.
Andrew Parker of the University of Oxford says the work is intriguing, but adds that there is more to be done to confirm that the region is directly involved in provoking these changes perception.
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