"Unconscious bias" can lead to racist behaviour even if people do not consider themselves to be racist, the Duke of Sussex has said.
Writing in Vogue, Prince Harry said unconscious bias was "something which so many people don't understand".
He said prejudice was "learned from the older generation, or from advertising, from your environment".
"Unless we acknowledge we are part of this cycle, then we're always going to be fighting against it," Harry added.
The duke made the comments during an interview with conservationist Dr Jane Goodall, which will be published in the September edition of Vogue - guest edited by the Duchess of Sussex.
The subject of unconscious bias arose during a discussion about children - and whether they can be born angry or learn to hate.
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Earlier this summer HRH The Duke of Sussex met with world renowned ethologist Dr. Jane Goodall for an intimate conversation on environment, activism, and the world as they see it. This special sit-down was requested by The Duchess of Sussex, who has long admired Dr. Goodall and wanted to feature her in the September issue of @BritishVogue, which HRH has guest edited. HRH and Dr. Goodall spoke candidly about many topics including the effects of unconscious bias, and the need for people to acknowledge that your upbringing and environment can cause you to be prejudiced without realising it. The Duke described that “[when] you start to peel away all the layers, all the taught behaviour, the learned behaviour, the experienced behaviour, you start to peel all that away - and at the end of the day, we’re all humans.” • Through @RootsandShoots the global youth service program @JaneGoodallInst founded in 1991, she has created and encouraged a global youth community to recognise the power of their individual strength – that each day you live, you can make a difference. Photos: ©️SussexRoyal / Chris Allerton #ForcesForChange
Dr Goodall said: "[Children] don't notice, 'My skin's white, mine's black,' until somebody tells them."
Harry responded: "It's the same as an unconscious bias - something which so many people don't understand, why they feel the way that they do.
"Despite the fact that if you go up to someone and say, 'What you've just said, or the way that you've behaved, is racist' - they'll turn around and say, 'I'm not a racist.'
"'I'm not saying that you're a racist, I'm just saying that your unconscious bias is proving that, because of the way that you've been brought up, the environment you've been brought up in, suggests that you have this point of view - unconscious point of view - where naturally you will look at someone in a different way.'
"And that is the point at which people start to have to understand."
He added: "You can only be taught to hate."
What is unconscious bias?
Unconscious bias is any detectable bias in our attitudes or behaviour that operates outside of our awareness.
It could be asking a man rather than a woman to pitch a project because, subconsciously, you presume he will be more confident and assertive.
Dr Doyin Atewologun is the director of the Gender Leadership and Inclusion Centre at the Cranfield School of Management. Crucially, she says, the impact is still very real whether it's conscious or not, and "no matter how tiny, or micro or everyday" it might be.