Engineered Protein Reveals Hidden Incoming Signals Between Neurons

Researchers have engineered a next-generation glutamate sensor, iGluSnFR4, capable of detecting the faintest incoming synaptic signals between neurons-signals that, until now, have been nearly impossible to record in living brain tissue. By capturing these whisper-quiet inputs, scientists can finally observe how neurons weigh thousands of glutamate messages and transform them into an electrical output, the core computation behind memory, learning, and emotion.