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Smell activates many parts of our brain, including our limbic system, which plays a key role in memory recall.

This innovative approach helped them pinpoint where these two systems interact in the brain -- specifically in a limbic region called the nucleus accumbens, which plays a key role in emotion, motivation, and reward processing.

They found the model was most often looking to the default mode network, striatum, and the limbic network to make the call.

The researchers also observed elevated activity in deeper limbic areas like the amygdala, which are essential for generating strong emotions, such as anxiety and fear.

In particular, they report, lower serotonin transporter levels were found in cortical, limbic, and subcortical regions of the brains in those with MCI, areas specifically responsible for executive function, emotion, and memory.