What’s good for your tummy may be good for your mind.

New research shows that people with a more robust balance of bacteria in their gut are more likely to perform well on tests of standard thinking skills including attention, flexibility, self-control and memory.

A Mediterranean diet that is rich in fruits and vegetables, whole grains, nuts, seeds and lean protein, and low in processed foods, plus regular physical activity, is known to be good for the brain.  The reason may be that such a diet, combined with physical activity, improve the quality of bacteria in the gut which then are able to optimise brain functions.

And while a healthy gut driving an efficient brain is obviously important for children who are learning, it is also important for adults.

A new study analysed the bacteria in the guts of nearly 600 participants, all aged in their fifties. Those with a diverse population of gut bacteria tended to do better on six standard tests of thinking skills and memory (cognition). Several specific kinds of bacteria—Barnesiella, the Lachnospiraceae FCS020 group and Sutterella—appeared to affect performance on mental tests. 

But the researchers said they must dig deeper to understand how and why. They know that the overall community (in the gut) is related to a lot, but are still not sure which specific members or characteristics of the community may be most relevant for brain functions.

The findings were published Feb. 8 in JAMA Network Open. They’re the latest in a recent series of examining the role of gut bacteria in health and disease.  The researchers do write that more research is needed to understand its implications and to better understand the link between gut and brain function and dysfunction. 

In the meantime, although taking probiotic supplements to help stock our guts with good bacteria may be beneficial, we should keep in mind that we ultimately need a whole community of bacteria to provide the diversity that may be needed.   To this end, eating more plant-based fibre (fruit and vegetables) is sensible – for healthy gut and brain functioning in all members of the family.

 

Martin Doherty, writing for The Conversation, says that at the age of about four, children reach important milestones in brain development.

One of these is a huge improvement in understanding others’ thoughts and feelings. This is the start of empathy.  Another is in spatial thinking—understanding how objects are positioned and related. This is the beginning of the ability to read maps.

Martin and his colleague, Catherine Sayer, conducted a study with 175 two to five-year-olds to explore how children are able to use scale models to figure out where something is in the real world. At about four, children are able to use a scale model of a room to work out where something is. We thought that this might result from children’s understanding of how one thing can represent something else. But we actually found that four-year-olds’ ability to use scale models came from their spatial abilities.

At the same age, children start to understand that someone’s behaviour is due to what that person believes, not necessarily what is really the case. This has interesting consequences.

If you’ve played hide-and-seek with young children, you may have noticed that they aren’t always very good at it. They love the ritual of looking in all the wrong places first, but beforehand they may tell you where they are going to hide, hide in the same place every time, or not be especially hidden.

After their fourth birthday, they get much better at hide and seek. They understand that the seeker looks in the wrong places because they don’t know where the hider is.

At about three to four children also start to tell lies. They realize they can make someone believe something that isn’t true.

Understanding symbols

Martin’s earlier research with fellow psychologist Josef Perner suggests that four-year-olds don’t just start to understand how others’ minds work. Figuring this out is part of the development of an understanding of “representation”—that symbols, like thoughts, words, or pictures, can be used to stand for something else.

Children start to think about how words relate to objects. This means, for instance, knowing that “animal” can refer to something you already have a name for, such as “rabbit”. This might help children learn the new word.

Their ability to use a understand the components of pictures also improves around this age. Very young children use a lot of trial and error to complete a jigsaw, picking up random pieces to see if they fit. By the time they are about four years old, they start to use the picture as a guide, trying to connect lines and match bits of colour, while checking the guide picture on the box lid.

Developmental experiments

Another ability children develop at around four is using scale models. A classic set of developmental experiments involved a model of a regular household room. The real room had typical furniture—sofa, table, cupboard and so on—and the model had miniature versions laid out in the same way.

Children were shown where something was hidden in the model and told to find an object hidden in “the same place” in the room. Children of around four can find the object using the identical layouts. If shown a sticker under a particular chair in the model room, for example, they can go straight to the “same” chair in the other room. This is the fundamental understanding required to read maps.

Adults see scale models and maps as representations. Maps represent a town or a country. A scale model of, say, the Eiffel Tower represents the real thing. At first, Martin suspected children’s ability to use scale models is more evidence of understanding representation at this age.

He was wrong. Instead, the researchers found that this ability is based on a development in children’s spatial abilities that also occurs at about four. This is the ability to think about spaces and where objects are within them. Spatial abilities help with maths skills, and good spatial ability is linked to an interest in science, technology, engineering and mathematics.

Their experiment was simple. They compared the model room task with a test of understanding how representation works. The two abilities develop around the same age, but they found they were not related. Children who could do one task couldn’t necessarily do the other.

They also had a test of purely spatial ability. Children who passed the model room task also passed the spatial task. So it looks like the model room task relied on children‘s spatial thinking.

They don’t yet know why two important but apparently unrelated abilities arise at the same time. Perhaps it’s related to changes in the growing brain at this  interesting age.

Provided by The Conversation

Image supplied by Freepik.