Researchers at Salk Institute discovered that the neural networks responsible for spatial perception change in a non-linear fashion and could have implications for neurodegenerative conditions such as Alzheimer's disease. Young kids often harbor the misconception that the moon is chasing them or
New experiences are absorbed into neural representations over time, symbolized here by a hyperboloid hourglass. Credit: Salk Institute
have found that spending time exploring an environment can cause neural connections to develop in unexpected ways., neurons in the hippocampus, which play a crucial role in spatial navigation, memory, and planning, represent space in a way that aligns with nonlinear hyperbolic geometry. This type of geometry is characterized by a three-dimensional expanse that expands exponentially .
This discovery provides valuable methods for analyzing data on neurocognitive disorders involving learning and memory, such as Alzheimer’s disease.“Our 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,” says Salk Professor Tatyana Sharpee, holder of the Edwin K. Hunter Chair, who led the study.
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.
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