Poor sleepers may be hoping that with the gradual liberalisation of marijuana laws around the world, a new drug to help them sleep will soon become legally available. Bad news, then, from a new diary study, published in Health Psychology, of people who take cannabis as a sleep aid. While the drug seemed to improve some aspects of sleep, it also led people to feel more tired the next day.
By Emma Young
As everyone knows, the nature of romantic relationships usually changes over time. An early period of intense attraction tends to develop into a less fiery, deeper attachment bond. According to evolutionary arguments, the early stage, which typically lasts a few years, gives the pair the time and proximity that’s required for developing a deeper nurturing, supportive – and predictable – relationship. While this type of attachment is important for rearing children, and for ongoing wellbeing, it’s not necessarily great news for passion.
“Though passion can still be experienced in the later stages, it tends to decline, on average,” note the authors of a new study, published in Social Psychology. They go on, however, to report that there is a group of people who experience higher sustained levels of both supportive warmth and nurturance and eroticism than is typical in relationships – only, they don’t get both from the same partner.
Over the last half century Western European countries have enjoyed a large increase in gender equality. There is a long way to go, but some statistics are striking: for instance, in Germany the employment rate for women has increased from 48 per cent in 1980 to 73 per cent in 2014. Psychologists are interested in whether, and how, these kind of societal-level changes filter down and affect children’s conceptions of gender.
To find out, a team at the University of Münster and Osnabrück University, led by Bettina Lamm, has compared the way that young German children in 1977 drew a human figure with the way that age-matched German children in 2015 drew a figure. The results, published in Sex Roles, suggest two parallel changes: girls in 2015 more often chose to draw a female figure than girls in 1977; at the same time, the children tested in 2015 depicted female figures as more distinctly feminine than the children in the 1970s.
“Societal changes over the last four decades in West Germany have clearly generated two trends,” the researchers said. “… growing status equality between the genders on the one hand, and increasing gender differentiation, on the other.”
By Emma Young
There’s a huge amount of research into how people differ in their ability to learn things deliberately and “explicitly”, such as memorising a list of words or instructions, for example. Far less studied is “implicit learning”. Ask a five-year-old to explain the grammatical rules of their language and they’ll likely have no clue where to start. And yet, they do know them – or at least, well enough to form coherent sentences. This kind of unconscious acquisition of abstract knowledge is an example of “implicit” learning.
Implicit learning may be especially important for young children, but adults depend on it, too. It “is recognised as a core system that underlies learning in multiple domains, including language, music and even learning about the statistical structure of our environments,” note the authors of a new paper, published in Cognition.
By Jesse Singal
When responding to science denialism (or, for that matter, any sort of false or harmful information), such as claims that vaccines are ineffective and harmful, it can be difficult to establish the right strategy. Because of the fast-paced way in which information spreads these days, there is a risk that responding to a given inaccurate claim can give it further oxygen, leading the falsehood to reach more people who are vulnerable to being misled, and so forth. There’s also the possibility of the “backfire effect” – people who already endorse the false claims reacting to the debunking information by digging into their beliefs further (though there’s now evidence such fears were overhyped, and that the backfire effect may not be a regular occurrence overall).
To better understand when science-denialism debunking does and doesn’t work, Philipp Schmid and Cornelia Betsch, both of the University of Erfurt in Germany, ran a series of studies that involved online respondents being exposed to various sorts of science debates. The results, published in Nature Human Behavior, offer some useful insights about how to best stem the tide of science denialism.
By Emma Young
A newborn baby knows almost nothing about the world it comes into. To make sense of the onslaught of incoming sensory information, she or he must start to notice meaningful patterns and categorise them: that particular combination of visual data signifies a “face”, for example, while that noise is a “voice”. As the authors of a new paper in Developmental Science point out, “without this fundamental categorisation function, our nervous systems would be overwhelmed by the sheer diversity of our experience.”
It had been thought that infants form these categories using information from just one sense, whichever is the most relevant. Following this account, the category of “faces” results from an accumulation of visual information about what faces look like. However, an intriguing new study, involving four-month-old infants and their mothers’ smelly t-shirts, suggests that babies’ early acquisition of the faces category is a truly multi-sensory process.
By guest blogger Lucy Maddox
The UK population continues to grow, while nursing numbers have remained static for several decades. Compounding matters, The King’s Fund and Nuffield Trust have reported a 25 per cent increase in nurses and midwives leaving the NHS from 2012 to 2018, from 27,300 to 34,100. In short, in the UK, we now have far fewer nurses relative to the general population than we used to.
What does this mean for patients’ care experience? The situation sounds bad, but how bad? Common sense would suggest that patients will experience poorer care when nurses are overstretched, and there’s plenty of anecdotal evidence to support that interpretation. But there are also positive stories, and claims about greater efficiency compensating for fewer staff.
Now a study in BMJ Quality & Safety provides direct observational evidence suggesting that lower nurse-patient ratios really do result in poorer health-care interactions.
By Emma Young
The last time I tried to learn a foreign language, I was living in an Italian suburb of Sydney. My hour a week at a local Italian class was inevitably followed by a bowl of pasta and a few glasses of wine. As an approach to language-learning goes, it was certainly more pleasurable than my German lessons at school. Despite the wine, it was also surprisingly effective. In fact, getting better at a new language doesn’t have to mean hard hours on lists of vocab and the rules of grammar. It turns out that what you don’t focus on matters, too. And a glass of wine may even help …
By guest blogger Bradley Busch
As father to an 18-month-old toddler, I would love to know exactly what my son is thinking. Along with many parents, one of the ways I try to find out is to ask him questions of the variety “Do you want X or Y?” But does his answer to this type of question actually reveal his preference or is it a more a reflection of a quirky cognitive bias that is more powerful in children than adults?
Two competing effects influence how adults respond to binary choices. The first is called “The Primary Effect” which describes the way that the first option we hear tends to stick in our minds. For example, one study found that adults are more likely to choose “heads” when asked if a coin toss is going to be “heads or tails”. The second effect, which sometimes contrasts with the Primary Effect, is called “The Recency Effect”. This captures the way that the last thing we hear or experience can also have more weight in our memory (this is why popstars end their concerts on their best songs, so that everyone leaves thinking the whole gig was great). In adults, neither the Primary Effect or the Recency Effect is always the more pronounced, with evidence suggesting that one’s personality type, familiarity of the information, and how controversial the topic is, all play a mediating role.
Keen to test if the same is true in young children, or if one of the effects is more dominant, a team led by Emily Sumner conducted two experiments and published their findings in a recent paper in PLOS One fantastically titled “Cake or Broccoli: Recency Biases Children’s Verbal Responses”.
Stress has complicated effects on our memories. Whereas some studies have found that we are better at remembering events that occurred during stressful situations, such as while watching disturbing videos, others have shown that stress impairs memory. Now a study published in Brain and Cognition suggests that stress doesn’t influence the strength of our emotional memories at all. Instead, the researchers claim, it is the fidelity of those memories – how distinct and precise they are – that changes when we go through stressful experiences.