Scientists studying brain process involved in sight have found the visual cortex also uses information gleaned1 from（从搜集到） the ears as well as the eyes when viewing the world. They suggest this auditory input2 enables the visual system to predict incoming information and could confer a survival advantage.Professor Lars Muckli, of the Institute of Neuroscience and Psychology3 at the University of Glasgow, who led the research, said: Sounds create visual imagery, mental images, and automatic projections4.So, for example, if you are in a street and you hear the sound of an approaching motorbike, you expect to see a motorbike coming around the corner. If it turned out to be a horse, youd be very surprised.The study, published in the journal Current Biology, involved conducting five different experiments using functional5 Magnetic Resonance6 Imaging to examine the activity in the early visual cortex in 10 volunteer subjects.In one experiment they asked the blindfolded7（被蒙上双眼的） volunteers to listen to three different natural sounds -- birdsong, traffic noise and a talking crowd.Using a special algorithm that can identify unique patterns in brain activity, the researchers were able to discriminate8 between the different sounds being processed in early visual cortex activity.A second experiment revealed even imagined images, in the absence of both sight and sound, evoked9 activity in the early visual cortex.Lars Muckli said: This research enhances our basic understanding of how interconnected different regions of the brain are. The early visual cortex hasnt previously10 been known to process auditory information, and while there is some anatomical evidence of interconnectedness in monkeys, our study is the first to clearly show a relationship in humans.In future we will test how this auditory information supports visual processing, but the assumption is it provides predictions to help the visual system to focus on surprising events which would confer a survival advantage.This might provide insights into mental health conditions such as schizophrenia or autism and help us understand how sensory11 perceptions differ in these individuals.The project was part of a five-year study funded by a 1.5m European Research Council consolidator12 grant entitled Brain reading of contextual feedback and predictions, and the Biotechnology and Biological Sciences Research Council.The researchers will explore more sounds to find out how precise predictive coding in the brain can be.
点击收听单词发音
1 gleaned v.一点点地采集（资料、事实）；（收割后）拾穗 参考例句： These figures have been gleaned from a number of studies. 这类数据是通过多次研究采集得来的。 A valuable lesson may be gleaned from it by those who have eyes to see. 明眼人可从中记取宝贵的教训。 来自《现代汉英综合大词典》
相关文章推荐
