“Update: On Twitter, some researchers argued, reasonably in my view, that I wasn’t quite sceptical enough in relating these findings. See the update at the end of this post for more details.”
If you wanted a poster child for the replication crisis and the controversy it has unleashed within the field of psychology, it would be hard to do much better than Fritz Strack’s findings. In 1988, the German psychologist and his colleagues published research that appeared to show that if your mouth is forced into a smile, you become a bit happier, and if it’s forced into a frown, you become a bit sadder. He pulled this off by asking volunteers to view a set of cartoons (paper ones, not animated) while holding a pen in their mouth, either with their teeth (forcing their mouth into a smile), or with their lips (forcing a frown), and to then use the pen in this position to rate how amused they were by the cartoons. The smilers were more amused, and the frowners less so – and best of all, they mostly didn’t discern the true purpose of the experiment, eliminating potential placebo-effect explanations.
This basic idea, that our facial expressions can feed back into our psychological state and behavior, goes back at least as far as Darwin and William James, but “facial feedback”, as it is known, had never been demonstrated in such an elegant and rigorous-seeming manner. Over time, this style of experiment was replicated and expanded upon, and soon it came to be considered a true blockbuster, so famous it found its ways into psychology textbooks, as well as popular books and articles citing it as an example of the unexpectedly subtle ways our bodies and environments can affect us psychologically. Often, facial feedback has been popularised along the lines of Maybe you can smile your way to happiness!, which added an irresistible self-help element that likely helped spread the idea. Either way, it seemed like a genuinely safe and solid psychological finding. That changed rather abruptly in 2016.
Amid all the talk of a “replication crisis” in psychology, here’s a rare good news story – a new project has found that a sub-field of the discipline, known as “experimental philosophy” or X-phi, is producing results that are impressively robust.
The current crisis in psychology was largely precipitated by a mass replication attempt published by the Open Science Collaboration (OSC) project in 2015. Of 100 previously published significant findings, only 39 per cent replicated unambiguously, rising to 47 per cent on more relaxed criteria.
Does power posing – such as standing with your hands on your hips and your feet spaced well apart – really help to improve your life?
Yes – according to Amy Cuddy, one of the pioneers of the idea, at Harvard University (famous for her massively popular TED talk on the subject and her best-selling book Presence). No – according to a critical analysis by Joseph Simmons and Uri Simonsohn at the University of Pennsylvania, published in Psychological Science in 2017. The pair’s statistical analysis of 33 previous studies of potential posture effects led them to a damning conclusion: “the existing evidence is too weak to… advocate for people to engage in power posing to better their lives.”
But now Cuddy, and colleagues, are back, with a new paper also published in Psychological Science. While Cuddy appears to be softening her claims about what power-posing can achieve, she and her colleagues argue that their new analysis shows that there is strong evidence that posture affects emotions in particular, and that power-posing is likely to have a meaningful impact on people, and should not be discounted.
A pre-registered mass replication attempt published in Perspectives on Psychological Science has raised doubts about another celebrated psychology finding. The collaboration between 40 laboratories found scant evidence for the so-called “Professor Prime”, undermining the famous finding that when people imagined themselves as a professor rather than a football hooligan it led them to perform better on a trivia quiz.
If you want to feel happier, avoid small talk and aim instead for profound conversations. That was the message the mainstream media took from a well-publicised paper published in Psychological Science in 2010 (e.g. Talk Deeply, Be Happy? asked the New York Times). But now an extension of that study, in press at the same journal (available as a pre-print), and involving two of the psychologists behind the original work, has found no evidence that how much – or little – time you spend chatting about the weather or what you’re having for dinner will affect your life satisfaction. “The failure to replicate the original small talk effect is important as it has garnered considerable scientific and lay interest,” note the authors.
For years, “ego depletion” has been a dominant theory in the study of self control. This is the intuitive idea that self control or willpower is a limited resource, such that the more you use up in one situation, the less you have left over to deploy in another. It makes sense of the everyday experience of when you come home after a hard day at the office, abandon all constructive plans, and instead binge on snacks in front of the TV.
The trouble is, the theory has taken some hard knocks lately, including a failed joint replication attempt by 23 separate labs. Critics have pointed out that most supportive studies – and there are over 200 of them – are small and underpowered. A meta-analysis that corrected for a positive bias in the existing literature concluded that ego depletion is not real. A study in India – where there’s a cultural belief that exercising self-control is energising – even found evidence for “reverse ego depletion“.
It’s not easy to weigh the evidence for and against, but perhaps the science is tipping back in favour of ego depletion. Two new studies, made publicly available on the PsyArXiv preprint website, provide what the researchers at Texas A&M University, led by Katie Garrison, describe as “the strongest evidence yet of the ego depletion effect”.
What’s in a smile? According to a widely reported 2010 study of US major league baseball players, which we covered here at BPS Research Digest, one important answer is: an indication of how long the smiler will live.
By analysing official individual photos of players from the 1952 baseball season, and then looking at subsequent death records, Ernest Abel and Michael Kruger at Wayne State University, Detroit, concluded that players who’d smiled like they meant it – with full “Duchenne smiles“, which involve muscles around the eyes as well as the mouth – lived on average seven years longer than players who’d posed with less convincing grins.
The result was taken to support existing evidence that happier people tend to live longer. It also seemed to show that smiles in posed photos – even on just one occasion – are a fairly reliable signal of people’s underlying emotional disposition and therefore their likely longevity.
But a new replication and extension of the Baseball photo study has produced very different results. This is important, because the idea that happier people live longer is widely promoted, and has implications both for individuals and policy-makers.
There’s been a lot of talk of the crisis in psychology. For decades, and often with the best of intentions, researchers have engaged in practices that have made it likely their results are “false positives” or not real. But that was in the past. The crisis is ending. “We do not call the rain that follows a long drought a ‘water crisis’,” write Leif Nelson at UC Berkeley and Joseph Simmons and Uri Simonsohn at the University of Pennsylvania. “We do not call sustained growth following a recession an ‘economic crisis'”.
In their paper, due for publication in the Annual Review of Psychology, the trio observe that had any psychologists been in hibernation for the last seven years, they would not recognise their field today. The full disclosure of methods and data, the pre-registration of studies, the publication of negative findings, and replication attempts – all of which help reduce risk of false positives – have increased immeasurably. “The improvements to our field have been dramatic,” they write. “This is psychology’s renaissance.”
As well giving the field of psychology a pep talk, their paper provides a useful review of how we got to this point, the reasons things are getting better, and the ongoing controversies.
The failure to reproduce established psychology findings on renewed testing, including some famous effects, has been well-publicised and has led to talk of a crisis in the field. However, psychology is a vast topic and there’s a possibility that the findings from some sub-disciplines may be more robust than others, in the sense of replicating reliably, even in unfavourable circumstances, such as when the participants have been tested on the same effect before.
A new paper currently available as a preprint at PsyArXiv has tested whether this might be the case for nine key findings from cognitive psychology, related to perception, memory and learning. Rolf Zwaan at Erasumus University Rotterdam and his colleagues found that all nine effects replicated reliably. “These results represent good news for the field of psychology,” they said.
In Part One, published yesterday, we reported the views of active research psychologists on the state of their field, as surveyed by Matt Motyl and his colleagues at the University of Illinois at Chicago. Researchers reported a cautious optimism: research practices hadn’t been as bad as feared, and are in any case improving.
But is their optimism warranted? After all, several high-profilereplication projects have found that, more often than not, re-running previously successful studies produces only null results. But defenders of the state of psychology argue that replications fail for many reasons, including defects in the reproduction and differences in samples, so the implications aren’t settled.
To get closer to the truth, Motyl’s team complemented their survey findings with a forensic analysis of published data, uncovering results that seem to bolster their optimistic position. In Part Two of our coverage, we look at these findings and why they’re already proving controversial.