Sentences with phrase «between brain size»

In the study, researchers were trying to determine the relationship between brain size and the number of neurons a species has, and to confirm the hypothesis that carnivores have more neurons than the herbivores that they prey upon.

Each theory makes predictions about the various relationships between brain size, features of societal organization, lifespan, length of childhood, and social learning, among other factors.

In the new study, the expected relationship between brain size and neuron number generally held up.

The link between brain size and social living was first noted in 1850, when scientists identified mushroom bodies in the insect brain.

A study of red deer on a Scottish island reveals some of the first evidence in wild mammals of a clear link between brain size and evolutionary fitness

No one knows whether the versions in question actually increase brain size, and the relationship between brain size and intelligence is also not clear.

Not exact matches

A study of older women with MCI found a tie between aerobic exercise and an increase in the size of the hippocampus, a brain area involved in learning and memory.

«Our own previous study on Facebook could only show correlation between social network size and the brain, but we could not determine the direction of causation between social brain regions and social network size,» notes Ryota Kanai of University College London, one of the researchers on the study.

There are several brain regions linked to sexual behaviour that differ in size between the sexes in humans and other mammals.

«In addition, when we compared adult brain proportions, we saw that the relationship between brain proportions and size depends on what group of mammals we look at, which is also incompatible with a universal rule for brain proportions.»

Recent studies suggest that the total loss in brain volume due to atrophy — a wasting away of tissue caused by cell degeneration — between our teen years and old age is 15 percent or more, which means that by the time we're in our seventies, our brains have shrunk to the size they were when we were between 2 and 3 years old.

These fossils, dating from 1.77 million years ago, had brains between 600 and 775 cubic centimeters in volume, whereas H. erectus is generally thought to have had an average brain size of around 900 cubic centimeters.

It shows, he adds, that interactions between predator and prey can affect the brain size.

Between birth and a child's first birthday, her brain nearly triples in size as... Read More

For the first time, Whitehead Institute scientists have documented a direct link between deletions in two genes — fam57ba and doc2a — in zebrafish and certain brain and body traits, such as seizures, hyperactivity, enlarged head size, and obesity.

«Severe stress affects the size of the structures in the brain, causes cell death, and affects the number of connections between brain cells,» observes Kalin.

«Depending on the size of the cell, we estimate that between 13 percent and 40 percent of brain cells will be hit once by cosmic rays,» Vazquez explains.

Through a «mapping» performed with magnetic resonance, they identified the affected part and the type and size of the lesion, and analyzed the connectivity between the different areas of the brain.

Between birth and a child's first birthday, her brain nearly triples in size as torrents of newborn nerve cells create neural pathways.

Despite differences in brain size, the researchers found striking similarities between primate species of gene expression in 16 regions of the brain — even in the prefrontal cortex, the seat of higher order learning that most distinguishes humans from other apes.

However, many other differences between species could also influence brain size.

The researchers divided each brain scan into small regions and analysed the neuronal connectivity between them, without making any assumptions about the ideal size of these regions for diagnosis.

Researchers knew that Neanderthal brains reached full size between the ages of 6 and 8 years and that they were about 10 percent larger than the brains of modern humans.

In a study reported in the journal Nutritional Neuroscience, the researchers looked for relationships between several omega - 3 fatty acids in the blood, the relative size of structures in the frontal and parietal cortices of the brain, and performance on tests of fluid intelligence in healthy elderly adults.

Aalto University neuroscientists, in collaboration with researchers at Helsinki University Hospital and Harvard Medical School, have found a novel connection between the size of the choroid plexus in the brain and complex regional pain syndrome (CRPS).

Interestingly, this brain region contains the hypothalamus, which was identified in 1991 as differing in size between gay and straight men.

These hominids, whose remains date to between about 100,000 and 60,000 years ago (SN: 4/30/16, p. 7), had chimp - sized brains, short statures and, like H. naledi, some skull features resembling early Homo species.

«The findings of the study indicate that simple causal relationships between the evolution of brain size, tool use and tooth size are unlikely to hold true when considering the complex scenarios of hominin evolution and the extended time periods during which evolutionary change has occurred,» said Aida Gómez - Robles, lead author of the paper and a postdoctoral scientist at GW's CASHP.

Other possible factors that might explain or influence the altruistic behavior — such as higher cognition (measured by brain size), hunting in groups, or stronger social bonds between group members — showed either much weaker correlations or no correlation at all with helping behaviors.

The images showed features such as the size of each brain region, the level of connectivity between neurons, and how much white matter was insulating the neurons.

Brain imaging studies also show a link between the overall size of the hippocampus and recurrent bouts of major depression.

If brain size had anything to do with innovation and creativity, some scientists expected to see a link between the so - called Mind's Big Bang (the emergence of bone tools and cave paintings that occurred between 50,000 and 70,000 years ago) and the emergence of modern - size human brains.

In fact, no associations were found between early brain responses and long - term outcomes, which could relate to the small size of the study or the fact that several patients were sedated during the fMRI and EEG tests.

Kabadai concluded: «There is still so much we need to understand and learn about the relationship between intelligence and brain size, as well as the structure of a bird's brain, but this study clearly shows that bird brains are not simply birdbrains after all!»

Ultimately, we will test how differences in brain size contribute to the shape and development of the skull between species and the evolution of rapid skull expansion found in mammals.

Despite the explosive growth in size and complexity of the human brain, the pace of evolutionary change among the thousands of genes expressed in brain tissue has actually slowed since the split, millions of years ago, between human and chimpanzee, an international research team reports in the December 26, 2006, issue of the journal, PLOS Biology.

Based on work with other mammals» brains, the team knew that there was a fairly predictable link between the size of a carnivore's cerebral cortex and how many neurons were in it.

These skulls are intermediate between H. erectus and H. sapiens in morphology, time, and brain size, nicely filling the gap which Goodman claims exists between them.

By applying the technique known as voxelation, developed by collaborators at UCLA, spatially defined regions (1 cubic millimeter in size) of the mouse brain can be characterized to develop three - dimensional (3D) relationships between cells and molecular networks.

The inverse relationship between the amyloid plaque density and pyramidal cell density in the AD brain regions also supports this possibility, as does the close correlation between plaque size and the size of local pyramidal cells.

Dr. Rapoport was a pioneer in studying the pathophysiology of ADHD and neuropharmacological approaches to its treatment, and she was the first to discover that some childhood psychiatric symptoms result from autoimmune reactions to streptococcal infection, the first to establish the link between obsessive - compulsive behaviors in children and OCD in adults, and the first to use longitudinal magnetic resonance imaging to uncover developmental abnormalities in brain size and structure in children with schizophrenia.

Figures for the average brain size of modern humans tend to vary between sources, but a typical value is 1350 or 1400 cc (cubic centimetres).

Chimpanzees have a brain size between 300 and 500 cc, with an average of 400 cc.

The association between Mediterranean - type diet and change in brain size across a 3 - year period in older age (73 - 76 years) is assessed in new research publishing in the journal Neurology.

The size of synapses gives us an idea of how much information is flowing between brain cells.

Because of the obvious humanness of the Turkana Boy fossil, and the fact that H. erectus brain sizes overlap the extreme lower range of modern human brain sizes, creationists have nowadays almost entirely abandoned the old line (popularized by Duane Gish) that Peking Man and Java Man are apes, and now generally claim that Homo erectus fossils are a variant form of modern humans (ignoring the inconvenient fact that there are many obvious differences between Homo erectus and Homo sapiens).

This number has been dubbed «Dunbar's Number» after the scientist Robin Dunbar, who found an association between primate brain size and average social group size (and don't forget, you're a primate).

Meditation improves memory, increases brain size, improves cooperation between brain hemispheres and enhances emotional intelligence according to the Exploration of Consciousness Research Institute.

(NaturalHealth365) Research has established a direct correlation between a decline in the size of the hippocampus — the memory center of the brain — and overall brain health.

In this particular study, the scientists theorized that less color contrast between plate and food makes our brains work harder to figure out appropriate portion sizes.