A new brain map shows how electrical circuits manage noise

Recently, there have been several recent developments in the field of international medical health that continue to attract the attention of the industry and the public. The study of brain cells that help African fish decode radio signals to prey, scan their deep environments, and communicate with their partners. By accurately mapping how these cells in the electrical sense of smell cortex are interconnected, the Columbia University Zuckerman Institute and colleagues have revealed how brain regions continue to learn to filter out interference that can cause fish to lose their ability to recognize radio waves.

They reported their findings in the journal Nature Nature. The African weak-electrolyte fish, also known as the nostril-electrolyte fish, has specialized organs on its skin that not only detect electric fields, but also emit electrical signals to help it scan the environment and communicate with other members of other species, similar to bats and dolphins using sound wave signals. However, interference with the electrophysical signals produced by the fish may affect its ability to sense changes in the electric field in the surrounding environment, much like screaming makes it difficult to hear any other sounds.

For decades, scientists have been keenly interested in a particular circuit network mechanism and its learning and predictive capabilities in this particular fish electrophysical signal processing system. This study manifests itself in the form of enhanced or impaired intercellular connections within the circuit. This process is known as neuronal synaptic plasticity.

However, there are many questions as to why certain cells exhibit slow synaptic plasticity in this circuit while other cells exhibit rapid synaptic plasticity in this circuit. These problems may include: the mechanisms for increasing or decreasing intercellular connections to coordinate cell behaviour associated with synaptic plasticity and how to correctly compensate for the noise from synaptic plasticity-related cells. Different types of plasticity exist even in all types of plasticity in the circuit.

To reveal how the networks in the fish's electrosensitive bundles achieve their goals, scientists used electron microscopy to create an extremely high-resolution map of the networks in the fish's electrosensitive bundles. They found that electrosensitive bundles were always paired with cells with fast-plastic characteristics, as opposed to cells with slow-plastic characteristics. Fast cells may learn quickly, but they are more vulnerable to random, less-consistent noise, said study co-author Dr.

Solomon Muller, a postdoctoral researcher at the Zuckerberg Institute in Columbia.