First, the scientists genetically engineered the flies to express a specific heat-sensitive ion channel in specific neurons. When this channel sensed heat, it fired the neuron. For example, this neuron caused the fly to open its wings, which it often does during mating.
The thermal trigger came in the form of iron oxide nanoparticles injected into the bugs’ brains. When a magnetic field appears nearby, these particles heat up, causing neurons to fire. The fly spread its wings and posed. The experiment showed that the insects took the desired position in about half a second when the magnetic field was turned on.
Why do scientists do this? Their ultimate goal is to create a method for partially restoring vision in humans. Researchers want to effectively stimulate the visual cortex.
Source: Ferra
