New research challenges the long-held belief that the brain makes decisions in a simple, top-down hierarchy. By discovering decision-making signals in the primary somatosensory cortex, researchers have revealed a system of bidirectional feedback loops that could be the key to building the next generation of energy-efficient, truly intelligent AI.
The Research
Led by electrical and computer engineering professor Yurii Vlasov at the University of Illinois Urbana-Champaign, the team recorded neural activity in mice navigating a virtual reality corridor. They found decision-making signals as early in the brain hierarchy as the primary somatosensory cortex (S1), an area traditionally associated with basic touch and perception. The study, published in Proceedings of the National Academy of Science (PNAS), shows that S1 is dynamically modulated by top-down regulation via feedback loops from higher-level brain regions. This suggests that decision-making doesn't follow a simple bottom-up flow from senses to frontal cortex; instead, the brain processes information bidirectionally.
Natural intelligence, shaped by a billion years of evolution, is far more computationally powerful and energy-efficient than current AI. Vlasov aims to “reverse-engineer” this architectural efficiency to create AI that is “less power hungry and more intelligent.”
Why It Matters
This insight into the brain's decision-making loops changes how we think about our own cognition. When you choose what to eat or which route to take, your brain isn't just processing data one-way. It’s dynamically updating early sensory areas with predictions from higher regions, making your decisions faster and more efficient. Understanding this can help you appreciate that your brain constantly reshapes perception based on expectations—a concept that can be leveraged in brain training.
What You Can Do
To harness your brain’s natural feedback loops, engage in activities that require fast, adaptive decision-making. Brain training exercises that challenge you to integrate sensory information and make quick, accurate choices can strengthen these bidirectional pathways. This not only improves cognitive flexibility but also enhances overall mental efficiency.
Source: Neuroscience News
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