Big heads really are smarter | UK news | The Guardian
What exactly is the correlation between IQ and brain size in adults? A correlation between and A meta-analysis by Michael A. McDaniel found a. And is there any simple connection between the size of a nervous system, however That is, measures such as the intelligence quotient (IQ) can be What about any numerical relation between brain size and intelligence?. The results showed a clear link between head size and loss of are vital for achieving good brain growth and development and this lasts.
Each was given an initial IQ test and a memory test, and was then asked to retake these three years later.
Why Brain Size Doesn’t Correlate With Intelligence
The decline in each person's cognitive powers was carefully calculated. The team then measured each individual's head circumference and searched their medical records for midwives' notes on which their head size at birth were recorded. The results showed a clear link between head size and loss of memory and cognitive ability in later life.
The bigger the head, the less the decline. However, Martyn stressed that his study found that those born with a small head were not automatically doomed to early senility.
It is subsequent brain growth in infancy and childhood that is the crucial criterion, he discovered. He was certainly a bright guy, but it's hard to get behind any statement so extreme.
Still, it's hard to dismiss brain size entirely. The weak relationship between brain size and intelligence that shows up within the human population is somewhat more striking across the animal kingdom.
Big heads really are smarter
Compared to other animals, humans have enormous brains compared to our body size triple what you would expect in an average animal.
Dolphins, other primates, and small whales also have big brains, and they're all pretty smart too. Within birds, parrots have big relative brain sizes, and chickens have tiny ones. And based on lab studies of learning and thinking, parrots are geniuses compared to chickens.Is There A Correlation Between Brain Size And Intelligence?
Overall, though, many factors besides mere size probably contribute to how well a brain functions, including the way it's organized, how many nerve cells are packed in per square inch, the quality of nutrition and environmental stimulation that you get while your brain is developing, and a host of other issues.
Also, don't forget that these studies measure intelligence in terms of I. Many successful, shrewd, creative, and intelligent people have only average I. Now try and answer these questions: What evidence supports the idea that brain size is related to intelligence?
What evidence suggests that brain size alone is not enough to predict intelligence?
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How do you reconcile these contrasting bodies of evidence? Suppose you wanted to find out if people with big noses had a better sense of smell than people with small noses. How would you test this idea? In the case of blindness, auditory or tactile somatosensory areas may grow in size, and hearing or touching sensitivity will improve accordingly. Dramatic as that compensatory growth may be, in the end the correlation between brain size and brain function is fraught. Consider the humble dog, Canis familiaris.
The brain of a wolf-size dog is about 30 percent smaller than that of an actual gray wolf, its ancestor. Has the dog become less smart since it went its own evolutionary way thousands of years ago? When the mere gaze from the dewy eyes of a member of this species causes you to get up from the couch, repair to the refrigerator and retrieve a hunk of cheese for your charge—well, you tell me who is smarter. The dog is successful not because of the size of its whole brain per se, but because domestication has led to subtle brain changes with a stunning result: To the brain reading this: You may grow as you process these words.