University of Rochester Scientists Develop Precision Optogenetic Technique to Control Long-Range Marmoset Neural Pathways

University of Rochester researchers use optogenetics to target specific neural pathways in marmosets, paving the way for new psychiatric disorder treatments.

By: AXL Media

Published: Mar 31, 2026, 5:19 AM EDT

Source: Information for this report was sourced from University of Rochester Medical Center

A New Frontier in Primate Neural Circuit Manipulation

The traditional study of the cerebral cortex has long been hindered by the sheer complexity of its interconnected architecture, which often forced researchers to observe brain regions in relative isolation. However, a breakthrough from the University of Rochester Del Monte Neuroscience Institute has introduced a method to navigate this complexity by focusing on the long-distance bridges that coordinate these regions. By utilizing the common marmoset, a primate model that provides a closer biological parallel to humans than traditional rodent models, scientists have successfully demonstrated a way to toggle specific neural pathways on or off with unprecedented accuracy.

The Precision Mechanics of Intersectional Optogenetics

At the heart of this development is a sophisticated application of optogenetics, a field that uses light to influence cells that have been genetically sensitized to it. The research team, led by Kuan Hong Wang, PhD, refined this viral technique to ensure that only the neurons connecting one specific region to another are modified. This intersectional approach prevents the accidental stimulation of neighboring cells that are not part of the targeted circuit, solving a persistent problem in neuroscience where broad activation often clouded the data regarding specific behavioral triggers.

Strategic Shift From Regional to Pathway Control

According to Wang, the primary value of this study lies in its ability to target the communication between regions rather than the regions themselves. By isolating these specific pathways, the researchers can now observe the direct results of a single "conversation" between different parts of the brain. This level of control is essential for deciphering the circuits that govern higher-order functions, including how a primate perceives its environment or makes a decision based on social cues. The ability to manipulate these pathways on demand provides a clear window into the biological software of complex cognition.