On 14 November 1922 the BBC broadcast its first radio report to the nation. We can’t listen to it because it was not recorded, but we know this: the broadcast was read in flawless received pronunciation (RP), commonly known as the Queen’s English. It is considered to be the language of elites, power and royalty.

For many years, the BBC would only allow RP accents to appear on its airwaves. That this accent became synonymous with the voice of a nation had clear connotations. RP was trusted, authoritarian and sincere. Fortunately, the BBC now allows all sorts of regional accents on its broadcasts – and even encourages it, aiming to both represent the diverse audience the BBC has and to draw new people in.

While the BBC no longer broadcasts only in RP, it turns out that the bias that once existed for it is still ripe in society today. Our accents can provide a window into our social backgrounds – and our biases. Our partialities can be so strong that they even affect our perception of who is, or is not, trustworthy.

Humans are very quick to judge a person based on accents, and are often unaware we do so. “Accent can trigger social categorisation in a prompt, automatic, and occasionally unconscious manner,” says Ze Wang of the University of Central Florida. We often can identify a person’s accent as soon they say hello.