Did you click on this article out of your own free will? Or was it predetermined by the cosmic evolution of particles, unfolding in an unbroken chain reaction set in motion by the big bang? Perhaps you think random quantum processes or unconscious brain activity were responsible? Whether you are philosophically inclined or not, the topic of free will is something most of us have pondered at some stage.

Research has shown that people tend to believe in free will, at least in some form. A more important question, perhaps, is whether it matters. This is the exact conundrum that researchers in psychology and experimental philosophy have been trying to answer recently. What would ultimately happen if people gave up on the idea of free will?

It may seem like a dangerous idea; something that could result in chaos and depression. And indeed, research has largely found that when you manipulate people to doubt free will, bad things happen – including an increase in behaviour such as cheating and aggression. This suggests that even if free will doesn’t exist, as many scientists and philosophers assume, it might be better for us to pretend that it does. But newer research by me and others suggests that doubting the existence of free will may not have such bad consequences, after all.

Philosophers have argued for centuries about what free will is and whether we have it. Positions vary widely, and it is impossible to give the subject full coverage here. At one end of the debate are libertarians, who contend that at least some of our choices and actions are not causally determined. At the other end are hard determinists who argue that every thought, action or event is a result of past events and the laws of nature.

When people talk about a disbelief in free will, determinism is usually the position that springs to mind. Yet, determinism is one of many positions within a family of views that dismiss the notion of free will. A position that has emerged more recently is called free will scepticism. While this position rejects the idea that humans possess genuine free will (but not necessarily agency), only some sceptics reject it because of determinism, while others argue that free will is impossible in an indeterministic or random universe.

But whichever tribe you identify with, what are the actual consequences of your beliefs? Before looking at some of the issues with recent experiments, let’s first explore how researchers began manipulating beliefs in the first place.

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The benefits of believing in free will

The first piece of research to experimentally manipulate free will beliefs was conducted by Kathleen Vohs and Jonathan Schooler in 2008. This work, which is now a seminal paper in the area, comprised two experiments. In the first experiment, the researchers asked participants to read text taken from Francis Crick’s classical book The Astonishing Hypothesis. Participants were allocated to read either an anti-free will version or a neutral one.

In the group that was manipulated to not believe in free will, the text stated that free will was illusionary and behaviour was driven by unconscious brain activity. For example, the text included sentences such as “everything people are and do is the product of simple, physical processes in their brains” and “although we appear to have free will, in fact, our choices have already been predetermined for us and we cannot change that.” In the control condition, the text did not mention free will and instead discussed research on consciousness.

After reading the text, all participants completed a mental-arithmetic task on a computer. They were told that a “programming glitch” meant that the solutions/answers to the task that they were meant to solve themselves would be visible. Participants were therefore encouraged to press the spacebar, which would ensure the solutions remained hidden. Therefore, whether or not participants decided to keep the answers hidden was used to indicate cheating.

The researchers speculated that those reading the anti-free will text would press the spacebar less so than the control condition. And this is what........

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