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"She remained unresponsive to stimuli. Her brain continued to swell, pushing the brain out of the skull cavity," said Mrs Prior.

In one 2019 study, participants had their brains scanned while experiencing a wide range of scary stimuli.

Afterward, the animals were placed in a new setting where they could escape the stimuli.

Which is why he and his team are now looking into how quickly the neural response to visual stimuli occurs in the olfactory regions.

Mrs Morrison said: "He was left to his own devices in a surrounding that he couldn't understand, with no stimuli, bright lights and bare walls."