Most of us have views on politics, current events, religion, society, morality and sport, and we spend a lot of time expressing these views, whether in conversation or on social media. We argue for our positions, and get annoyed if they are challenged. Why do we do this? The obvious answer is that we believe the views we express (ie, we think they are true), and we want to get others to believe them too, because they are true. We want the truth to prevail. That’s how it seems. But do we really believe everything we say? Are you always trying to establish the truth when you argue, or might there be other motives at work?

These questions might seem strange, offensive even. Am I suggesting that you are insincere or hypocritical in your views? No – at least I’m not suggesting that you are consciously so. But you might be unconsciously influenced by concerns other than truth. Nowadays, most psychologists agree that rapid, unconscious mental processes (sometimes called ‘System 1’ processes) play a huge role in guiding our behaviour. These processes are not thought of as Freudian ones, involving repressed memories and desires, but as ordinary, everyday judgments, motives and feelings