Leiden Psychology Blog

Where on earth did the effect go?

One replication is worth at least a thousand t-tests, indeed, but several replications (let’s say about twenty) and well-powered studies are worth at least a million t-tests.

Marc Molendijk • 19-03-2013

Why we eat cows (and sometimes horses), but not dogs

Most people in Western culture have no problem with eating cows, pigs and chickens. However, the idea of eating dogs tends to disgust us. Why do we make such mental distinctions between ‘animals for eating’ and ‘animals not for eating’?

Sabine Peters • 14-03-2013

Measuring the unconscious mind

People are unaware of much of the knowledge they possess, making it hard for psychologists to study this knowledge. We need ways to investigate the unconscious mind, and perhaps making use of people’s greediness is one of the ways to do this.

Roy de Kleijn • 12-03-2013

Women in high places

Having more women in top positions does not as a matter of fact improve career opportunities for other women. On the contrary, successful women who display 'modern sexism' to cope with a masculine work environment can undermine the ambitions of other women

Naomi Ellemers • 07-03-2013

Perceptions of pseudovoice

Since last week citizens in the Netherlands can start a referendum on any issue that matters to them. However, the outcome can easily be ignored by the government. This is an example of ‘pseudovoice’, and therefore mostly ineffective.

Gerdien de Vries • 04-03-2013

Ski accidents and random sampling

“Dutch wounded through skiing: a remarkable increase of 14 percent” writes the The Dutch newspaper NRC. Is this really a noticeable increase or just random sampling? A quick statistical procedure provides the answer.

Mark de Rooij • 27-02-2013

The pregnant brain: good or bad?

Are pregnancy hormones detrimental to cognitive capacities, or do they make the brain resilient to stress and increase memory performance?

Jiska Peper • 25-02-2013

Towards a new publication model in psychology

The quality of psychological research as currently published in academic journals is questionable because of possible 'data dredging'. It is time for psychologists to decide on a new publication model that would certainly alleviate this problem.

Mark de Rooij • 19-02-2013

Alcohol and adolescents: why do teens drink?

Recently the Dutch government proposed to raise the legal drinking age from 16 to 18. High levels of alcohol use in adolescence are related to alcohol dependence later in life. Recent research shows that also pubertal hormones play a role.

Barbara Braams • 18-02-2013

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