Category: Replications

Emotion, Methods, Replications March 28, 2018March 28, 2018

54-study analysis says power posing does affect people’s emotions and is worth researching further

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.

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Cognition, Emotion, Replications December 14, 2017January 26, 2018

“Strongest evidence yet” for ego depletion – the idea that self control is a limited resource

By Christian Jarrett

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”.

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Emotion, Health, Replications December 8, 2017December 12, 2017

Replication failure: No evidence that big smilers live longer

By Emma Young

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.

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Methods, Replications November 17, 2017November 17, 2017

We are witnessing a renaissance in psychology

By Christian Jarrett

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.

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Cognition, Memory, Methods, Perception, Replications June 5, 2017July 5, 2017

These nine cognitive psychology findings all passed a stringent test of their replicability

By Christian Jarrett

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.

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Methods, Replications, Social May 25, 2017May 26, 2017

Was the “crisis” in social psychology really that bad? Have things improved? Part One: the researchers’ perspective

By Alex Fradera

The field of social psychology is reeling from a series of crises that call into question the everyday scientific practices of its researchers. The fuse was lit by statistician John Ioannidis in 2005, in a review that outlined why, thanks particularly to what are now termed “questionable research practices” (QRPs), over half of all published research in social and medical sciences might be invalid. Kaboom. This shook a large swathe of science, but the fires continue to burn especially fiercely in the fields of social and personality psychology, which marshalled its response through a 2012 special issue in Perspectives on Psychological Science that brought these concerns fully out in the open, discussing replication failure, publication biases, and how to reshape incentives to improve the field. The fire flared up again in 2015 with the publication of Brian Nosek and the Open Science Collaboration’s high-profile attempt to replicate 100 studies in these fields, which succeeded in only 36 per cent of cases. Meanwhile, and to its credit, efforts to institute better safeguards like registered reports have gathered pace.

So how bad did things get, and have they really improved? A new article in pre-print at the Journal of Personality and Social Psychology tries to tackle the issue from two angles: first by asking active researchers what they think of the past and present state of their field, and how they now go about conducting psychology experiments, and second by analysing features of published research to estimate the prevalence of broken practices more objectively.

The paper comes from a large group of authors at the University of Illinois at Chicago under the guidance of Linda Skitka, a distinguished social psychologist who participated in the creation of the journal Social Psychological and Personality Science and who is on the editorial board of many more social psych journals, and led by Matt Motyl, a social and personality psychologist who has published with Nosek in the past, including on the issue of improving scientific practice.

Psychology research is the air that we breathe at the Digest, making it crucial that we understand its quality. So in this two-part series, we’re going to explore the issues raised in the University of Illinois at Chicago paper, to see if we can make sense of the state of social psychology, beginning in this post with the findings from Motyl et al’s survey of approximately 1,200 social and personality psychologists, from graduate students to full professors, mainly from the US, Europe and Australasia.

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