Smell is a symphony: New model for how the brain is organized to process odor information

Just like a road atlas faithfully maps real-word locations, our brain maps many aspects of our physical world: Sensory inputs from our fingers are mapped next to each other in the somatosensory cortex; the auditory system is organized by sound frequency. The olfactory system was believed to map similarly, where groups of chemically related odorants - amines, ketones, or esters, for example - register with clusters of cells that are laid out next to each other.

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