This gives us a potential brain mechanism for understanding why older and younger adults process facial cues about trust differently.

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The results provide one mechanism by which the brain could gather information on expressions.

ECONOMIST: Facial characteristics

But the AbioCor lacks a response to "fight or flight, " a hormonal mechanism triggered by the brain.

FORBES: Lonely Heart

This has led Dr Arendt to suggest that rather than being a part of a disease process, the formation of the tau protein could be a mechanism by which the brain protects itself.

ECONOMIST: Dementia

It seems to have a unique mechanism of action in the brain.

BBC: Pill to boost brain power

She said the study did not "get us any further since it does not present a convincing mechanism by which pollutants could affect the developing brain to result in autism".

BBC: Autism: Traffic pollution linked, study suggests

The studies, one on mice and one on people, have identified two hormones that seem to fine-tune the perception of sweetness, and thus regulate the intake of sugar independently of the previously known mechanism of satiation that is located in the brain.

ECONOMIST: Hormones influence how sensitive taste buds are to sugar

The mechanism is unclear, but cooling may help reduce brain inflammation.

FORBES: Magazine Article

The mechanism behind this bias appears to be located in a specific part of the brain, the left inferior frontal gyrus, which is involved in language, among other functions.

WSJ: Resolutions: So Irresistible, So Hard to Keep

The exact mechanism is unknown, but certain bacteria are thought to facilitate important interactions between the gut and the brain.

WSJ: A Gut Check for Many Ailments