I’m sitting in the soft-spoken cognitive neuroscientist’s spotless office, nestled within New York University’s psychology department, but it feels like I’m at the doctor’s office getting a dreaded diagnosis.

On his giant monitor, David Amodio shows me a big blob of data depicting where people score on the Implicit Association Test (IAT).

The test measures racial prejudices that we cannot consciously control.

I’ve taken it three times now.

This time, my uncontrolled prejudice, while clearly present, has come in significantly below the average for white people like me.

That certainly beats the first time I took the IAT. That time, my results showed a ‘strong automatic preference’ for European Americans over African Americans.

That was not a good thing to hear, but it’s extremely common – 51 per cent of online test takers show moderate to strong bias.

The test asks you to rapidly categorise images of faces as either ‘African American’ or ‘European American’ while you also categorise words (such as evil, happy, awful and peace) as either ‘good’ or ‘bad’.

Faces and words flash on the screen, and you tap a key, as fast as you can, to indicate which category is appropriate.

Sometimes you’re asked to sort African American faces and ‘good’ words to one side of the screen.

Other times, black faces are to be sorted with ‘bad’ words.

As words and faces keep flashing by, you struggle not to make too many sorting mistakes. And then suddenly, you have a horrible realisation. When black faces and ‘bad’ words are paired, you feel yourself becoming faster in your categorising – an indication that the two are more easily linked in your mind.

You think of yourself as a person who strives to be unprejudiced, but you can’t control these split-second reactions.

As the milliseconds are being tallied up, you know the tale they’ll tell: when negative words and black faces are paired, you’re a better, faster categoriser.

Which suggests that racially biased messages from the culture around you have shaped the very wiring of your brain.

We’re not born with racial prejudices.

We may never even have been ‘taught’ them.

Rather, explains University of Virginia psychologist Brian Nosek, prejudice draws on “many of the same tools that help our minds figure out what’s good and what’s bad.”

In evolutionary terms, it’s efficient to quickly classify a grizzly bear as dangerous.

However, the trouble comes when the brain uses similar processes to form negative views about groups of people.

But here’s the good news: research suggests that once we understand the psychological pathways leading to our prejudices, we just might be able to train our brains to move in the opposite direction.

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Brains are filing cabinets
Brains are filing cabinets

Dog, cat. Hot, cold. Black, white. Male, female. We constantly categorise. We have to.

Sorting anything from furniture to animals to concepts into different folders inside our brains is something that happens automatically, and it helps us function.

In fact, categorisation has an evolutionary purpose: assuming that all mushrooms are poisonous and that all lions want to eat you is a very effective way of coping with your surroundings.

Forget being nuanced about nonpoisonous mushrooms and occasionally nonhungry lions – certitude keeps you safe.

But a particular way of categorising can be inaccurate, and those false categories can lead to prejudice and stereotyping.

Much psychological research into bias has focused on how people ‘essentialise’ certain categories, which boils down to assuming that these categories have an underlying nature that is tied to inherent and immutable qualities.

Like other human attributes (gender, age and sexual orientation are some examples), race tends to be strongly – and inaccurately – essentialised.

This means that when you think of people in that category, you rapidly or even automatically come up with assumptions about their characteristics.

Common stereotypes with the category ‘African Americans’, for example, include ‘loud’, ‘good dancers’ and ‘good at sports’.

Essentialism about any group of people is dubious – aged people are not inherently feebleminded, women are not innately gentle – and when it comes to race, the idea of deep and fundamental differences has been roundly debunked by scientists.

Even people who know that essentialising race is wrong can’t help absorbing the stereotypes that are pervasive in US culture. In polls, for example, few Americans admit holding racist views.

But when told to rate the intelligence of various groups, more than half exhibited strong bias against African Americans.

Even the labels used seem to affect the level of prejudice: another study found that test subjects associated the term black with more negative attributes – such as low socioeconomic status – than African American.

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