Seeing and Imagining Activate some of the Same Brain Cells

Why It Matters

Demonstrating overlapping neurons for seeing and imagining clarifies how the brain constructs mental images, a core function for memory, planning, and creativity. This insight could inform novel interventions for psychiatric conditions where imagery is impaired.

Key Takeaways

• 40% of perception neurons reactivate during mental imagery
• Intracranial electrodes recorded from 16 epilepsy patients
• Machine learning reconstructed imagined pictures from neural data
• Supports generative‑model theory of visual processing
• Implications for therapies targeting schizophrenia and PTSD

Pulse Analysis

The new study bridges a long‑standing gap in neuroscience by showing that the same individual neurons fire when we see an object and when we picture it in our mind. Prior work relied on fMRI, which could only infer regional overlap, but the use of intracranial electrodes provided single‑neuron resolution. By presenting participants with thousands of images across categories—faces, text, plants, animals, and objects—the researchers identified a subset of neurons tuned to specific visual features, then demonstrated that roughly two‑fifths of these cells re‑engage during imagination. This direct neural overlap validates the brain’s generative‑model framework, where stored perceptual codes are repurposed to simulate future or remembered scenes.

Beyond basic science, the discovery has practical implications for mental‑health treatment. Conditions such as schizophrenia and post‑traumatic stress disorder involve distorted or intrusive mental imagery; understanding the precise neuronal circuitry could guide targeted neuromodulation or pharmacological strategies. Moreover, the ability to decode imagined content from neural activity hints at future brain‑computer interfaces that translate thoughts into visual outputs, a prospect with both therapeutic and creative potential.

The research also raises new questions about the limits of neural reuse. While the study focused on relatively simple, static images, real‑world imagination often involves dynamic, abstract, or artistic constructs. Future investigations will need to explore whether higher‑order cortical areas similarly recycle perceptual codes for complex visual art or dreaming. As the field moves toward mapping the full hierarchy of imagery‑related neurons, the current findings lay a solid foundation for both scientific inquiry and translational applications.