Hallucinating Neurons: Seeing What Isn’t There
- A new study published in Nature Neuroscience details progress in understanding how specific neurons in the visual system correlate with perceived stimuli, paving the way for potential direct...
- Adesnik are making strides in identifying "IC-encoders"-neurons that respond specifically to image content, rather than simply detecting the presence of a stimulus.
- The team used optogenetics, a technique that uses light to control neurons, to stimulate these IC-encoders.
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Researchers Move Closer too “Reading” Brain Activity to Directly Influence Behavior
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A new study published in Nature Neuroscience details progress in understanding how specific neurons in the visual system correlate with perceived stimuli, paving the way for potential direct manipulation of behavior through optogenetics.
Decoding Visual Perception
Researchers led by Dr. Adesnik are making strides in identifying ”IC-encoders”-neurons that respond specifically to image content, rather than simply detecting the presence of a stimulus. These neurons appear to encode *what* is being seen, not just *that* something is being seen. This is a crucial distinction for understanding how the brain interprets visual details.
The team used optogenetics, a technique that uses light to control neurons, to stimulate these IC-encoders. Currently, the ability to stimulate only a small number of neurons limits the impact, but the research demonstrates a proof-of-concept: specific neuronal activity can be linked to specific perceptual experiences.
the Next Frontier: Behavioral Control
The ultimate goal,according to Dr. Adesnik, is to stimulate these IC-encoders and directly elicit a behavioral response in an animal, even without presenting a visual stimulus. “What we would do is photo-stimulate these neurons and see if we can generate an animal’s behavioral response even without any stimulus on the screen,” he stated in the Nature Neuroscience publication.
Currently, technical limitations restrict the number of neurons that can be effectively stimulated. IC-encoders are also relatively rare and distributed throughout the visual system. However, researchers believe that increasing the number of stimulated neurons – possibly by 3 to 10 times – could be enough to trigger observable behavioral changes. This experiment is a high priority for the team.
Optogenetics and the Future of Neuroscience
Optogenetics, first developed in the early 2000s, has revolutionized neuroscience by allowing researchers to control neuronal activity with unprecedented precision.The technique involves genetically modifying neurons to express light-sensitive proteins, enabling researchers to activate or inhibit specific neurons using light. Deisseroth et al. (2010) provide a extensive overview of the progress and applications of optogenetics.
this study builds upon the growing body of research exploring the relationship between neuronal activity and behavior. By identifying and manipulating IC-encoders, researchers are gaining a deeper understanding of how the brain transforms sensory input