Release date: 2017-12-06
Recently, neuroscientists at the University of Glasgow have developed a deeper understanding of visual mechanisms by studying functional magnetic resonance imaging (fMRI) and seeing a continuous two-way dialogue between the brain and the eye.
The study, led by Professor LarsMuckli of the University of Glasgow, uses fMRI and optical illusions to prove that when the eye moves next, the brain predicts what it can see.
In particular, the optical illusion involves two stationary, blinking squares, because the brain predicts motion, so the observer is seen as a square that moves between these two positions. During these flashes, the researchers asked participants to move their eyes. The researchers then imaged the participants' visual cortex and found that their predictions of exercise were updated to new spatial locations in the cerebral cortex as eye movements changed.
Usually we move our eyes about 4 times per second, which means our brain needs to process new visual information every 250 milliseconds. However, the world still looks stable, because our brains are prepared for the rain. In other words, the brain can predict what you will see when you move your eyes.
Professor LarsMuckli from the Institute of Neuroscience and Psychology said, "This study is very important because it proves that fMRI can contribute to the field of neuroscience research. In addition, finding a viable brain function mechanism will help brain computing. And artificial intelligence, as well as helping us investigate mental illness."
The study also revealed the potential of fMRI to contribute to the field of neuroscience research, as the authors were able to find that processing differences of only 32 milliseconds were much faster than the commonly considered fMRI.
Dr. Gracie Edwards said, "Visual information is received from the eye and processed by the brain's visual system. We call visual information a "feedforward" input, and the brain sends information to the visual system. This information is called "feedback."
Based on our memory of similarly perceived events, feedback can affect our perception of feedforward inputs. Feedforward and feedback information interact to produce visual scenes that we feel every day. â€
Reference material
1) Predictive feedback to V1 dynamically updates with sensory input
2) The human brain can 'see' what is around the corner
Source: Bio-Exploration
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