{"id":37536,"date":"2023-01-04T14:35:20","date_gmt":"2023-01-04T22:35:20","guid":{"rendered":"https:\/\/vermont.salk.edu\/?post_type=disclosure&p=37536"},"modified":"2023-12-11T12:27:45","modified_gmt":"2023-12-11T20:27:45","slug":"the-brains-ability-to-perceive-space-expands-like-the-universe","status":"publish","type":"disclosure","link":"https:\/\/www.salk.edu\/zh\/news-release\/the-brains-ability-to-perceive-space-expands-like-the-universe\/","title":{"rendered":"\u5927\u8111\u611f\u77e5\u7a7a\u95f4\u7684\u80fd\u529b\u50cf\u5b87\u5b99\u4e00\u6837\u4e0d\u65ad\u6269\u5c55"},"content":{"rendered":"

LA JOLLA\u2014Young children sometimes believe that the moon is following them, or that they can reach out and touch it. It appears to be much closer than is proportional to its true distance. As we move about our daily lives, we tend to think that we navigate space in a linear way. But Salk scientists have discovered that time spent exploring an environment causes neural representations to grow in surprising ways.<\/p>\n

\"New
New experiences are absorbed into neural representations over time, symbolized here by a hyperboloid hourglass.
Click here<\/a> for a high-resolution image.
Credit: Salk Institute<\/figcaption><\/figure>\n

The findings, published in Nature Neuroscience<\/em><\/a> on December 29, 2022, show that neurons in the hippocampus essential for spatial navigation, memory, and planning represent space in a manner that conforms to a nonlinear hyperbolic geometry\u2014a three-dimensional expanse that grows outward exponentially. (In other words, it\u2019s shaped like the interior of an expanding hourglass.) The researchers also found that the size of that space grows with time spent in a place. And the size is increasing in a logarithmic fashion that matches the maximal possible increase in information being processed by the brain.<\/p>\n

This discovery provides valuable methods for analyzing data on neurocognitive disorders involving learning and memory, such as Alzheimer\u2019s disease.<\/p>\n

\u201cOur study demonstrates that the brain does not always act in a linear manner. Instead, neural networks function along an expanding curve, which can be analyzed and understood using hyperbolic geometry and information theory,\u201d says Salk Professor Tatyana Sharpee<\/a>, holder of the Edwin K. Hunter Chair, who led the study. \u201cIt is exciting to see that neural responses in this area of the brain formed a map that expanded with experience based on the amount of time devoted in a given place. The effect even held for miniscule deviations in time when animal ran more slowly or faster through the environment.\u201d<\/p>\n

Sharpee\u2019s lab uses advanced computational approaches to better understand how the brain works. They recently pioneered the use of hyperbolic geometry to better understand biological signals like smell molecules, as well as the perception of smell.<\/p>\n

In the current study, the scientists found that hyperbolic geometry guides neural responses as well. Hyperbolic maps of sensory molecules and events are perceived with hyperbolic neural maps. The space representations dynamically expanded in correlation with the amount of time the rat spent exploring each environment. And, when a rat moved more slowly through an environment, it gained more information about the space, which caused the neural representations to grow even more.<\/p>\n

\"From
From left: Huanqiu Zhang and Tatyana Sharpee
Click here<\/a> for a high-resolution image.
Credit: Salk Institute<\/figcaption><\/figure>\n

\u201cThe findings provide a novel perspective on\u00a0how neural representations can be altered with experience,\u201d says Huanqiu Zhang, a graduate student in Sharpee\u2019s lab. \u201cThe geometric principles identified in our study can also guide future endeavors in understanding neural activity in various brain systems.\u201d<\/p>\n

\u201cYou would think that hyperbolic geometry only applies on a cosmic scale, but that is not true,\u201d says Sharpee. \u201cOur brains work much slower than the speed of light, which could be a reason that hyperbolic effects are observed on graspable spaces instead of astronomical ones. Next, we would like to learn more about how these dynamic hyperbolic representations in the brain grow, interact, and communicate with one another.\u201d<\/p>\n

Other authors include P. Dylan Rich of Princeton University and Albert K. Lee of the Janelia Research Campus at the Howard Hughes Medical Institute.<\/p>\n

The research was supported by an AHA-Allen Initiative in Brain Health and Cognitive Impairment award made jointly through the American Heart Association and the Paul G. Allen Frontiers Group (19PABH134610000), the Dorsett Brown Foundation, the Mary K. Chapman Foundation, an Aginsky Fellowship, the National Science Foundation (IIS-1724421), the National Science Foundation Next Generation Networks for Neuroscience Program (Award 2014217), the National Institutes of Health (U19NS112959 and P30AG068635), and the Howard Hughes Medical Institute.<\/p>","protected":false},"featured_media":37550,"template":"","faculty":[66],"disease-research":[332,124,464],"class_list":["post-37536","disclosure","type-disclosure","status-publish","has-post-thumbnail","hentry","faculty-tatyana-sharpee","disease-research-computational-biology","disease-research-neuroscience-and-neurological-disorders","disease-research-perception"],"acf":[],"yoast_head":"\nThe brain\u2019s ability to perceive space expands like the universe - Salk Institute for Biological Studies<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.salk.edu\/zh\/news-release\/the-brains-ability-to-perceive-space-expands-like-the-universe\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The brain\u2019s ability to perceive space expands like the universe - Salk Institute for Biological Studies\" \/>\n<meta property=\"og:description\" content=\"LA JOLLA\u2014Young children sometimes believe that the moon is following them, or that they can reach out and touch it. 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