Of all of the parts of your body that radiate design and complex structure, the brain is probably the most amazing. When we compare what the brain allows us to do and human efforts to build a computer to duplicate those things, we realize the incredible nature of the brain’s creation. No computer can do everything your brain does and probably never will.
A big question in understanding the brain is what controls intelligence. For example, a blue whale has a giant brain, almost five times as big as ours, but there is no evidence that they have superior intelligence. However, brain size is a factor in how much energy it uses. Our brain is about 2% of our body weight, but it consumes 20% of our energy.
Studies have shown large variations in brain size within the bird family. For example, ravens have bigger brains than the much larger ostriches, and they also demonstrate greater intelligence. On the other hand, some fish have tiny brains. For instance, bony-eared assfish have the smallest brain-to-body mass ratio of any vertebrate, but they require only a few simple functions to survive in their deep ocean environment.
Research has shown that different parts of animal brains are different sizes depending on the animal’s needs. For example, owls have a more extensive section of their brains related to sight than other birds that don’t hunt at night. Crows and parrots have the largest brain size compared to the bodyweight of all birds. They are also considered to be the most intelligent of all birds. It is quite clear, however, that brain size is not a primary factor in intelligence. On average, male human brains are larger than female brains, and no one would suggest that males are more intelligent.
The bottom line is that brains are tailor-made to fit what the individual needs to survive. Also, the critical factor isn’t the size of the brain but the size of the brain section the animal requires for survival. In humans, the ability to create art and music does not seem to be related to the brain. Mentally challenged humans frequently create marvelous works of art and compose beautiful music. The human capacity to worship and to believe there is more to existence than this life do not seem to be related to any brain response.
What the brain allows us to do is an incredible demonstration ofGod’s wisdom and design. However, it is not our brains but our spiritual make-up that makes humans different from other living things. We are created in the image of God, allowing us to do things and understand things that are beyond all other life on Earth.
We tend to equate the use of tools and intelligence, but do they necessarily go together? Many kinds of animals use twigs, stones, or other objects as tools to gather food, to groom or defend themselves, or sometimes just to play. We are very familiar with how dogs can be taught to play with a ball or stick. Intelligent animals such as primates, mammals, and birds use or even create tools from materials around them.
Sometimes animals learn tool-use by watching other animals or humans. At other times tool-use seems to be instinctive. An internet search for “animals using tools” brings up many interesting videos. Ever since animal researcher Jane Goodall discovered chimpanzees using leaves and twigs as tools to obtain food in 1960, some people have suggested that tool-use is proof that humans are not unique from other animals—we have just evolved greater intelligence.
But the question is, “Does it take intelligence to use tools?” The short answer is “No.” Decorator crabs camouflage themselves with objects and plants, and they may pick up a sea anemone and use it to sweep across the sea floor picking up food. The assassin bug takes material from a termite’s nest to camouflage itself while waiting to grab a termite emerging from the nest. It then kills the termite and uses it as bait to coax other termites out of the nest. The larva of the green lacewing camouflages itself with objects such as sand grains to hide from and capture aphids.
Crabs, assassin bugs, and insect larvae have no “thinking” brain. They are not capable of being taught or learning by observation. How can they use objects as tools? In some cases, if the first of their kind could not use these tools, the species would have become extinct. We suggest that the Creator has “programmed” these unintelligent animals with the instincts they need to survive.
My first master’s degree was in psychometry, which is the study of tests and measurements. I worked under Dr. David Segel who was a pioneer in that field. One of the interesting things I learned in my studies was that IQ and intelligence are two different things. Many people use the terms interchangeably, but IQ (Intelligence Quotient) is a measure of your ability to perform on a certain kind of test. My mentally challenged son Tim scores very poorly on a Stanford Benet IQ test and very well on a Wechsler Bellevue IQ test. The Stanford Benet test measures an individual’s ability to manipulate and control shapes and spaces. The Wechsler Bellevue is a verbal test. The two tests measure different things, and Tim’s scores were wildly different depending on the type of test.
IQ and intelligence should not be confused. Webster’s dictionary defines intelligence as “the ability to learn and understand,” which has nothing to do with any test. IQ is radically affected by access to education, healthcare, food, living conditions, and the kind of test used. The average IQ in Kenya in 1948 was 72, and today the average is 97. A 25 point gain is not an indication of a change in intelligence, but rather a change in the ability of the people to better answer the questions on the chosen test.
It isn’t possible to compare the intelligence of humans on the basis of race or to compare humans with animals. Some animals do very well on some IQ tests. Koko, the gorilla that we have mentioned in previous issues of our journal, scores a 95 on some IQ tests according to articles in several popular magazines. Crows have high intelligence in solving certain types of problems. A food morsel floating on water in the bottom of a graduate frustrates children under eight years old because the can’t figure out how to get to it. A crow, however, will add pebbles to the graduate until the food floats up to a place where the crow can reach it. Who has the most intelligence?
An interesting area of discussion in talking about what makes a human is the question of intelligence and IQ tests. For several hundred years there have been debates among intellectuals about whether intelligence is related to race, sex, or genetics. Some interesting experiments have been conducted to measure intelligence in animals, and scientists have found that creatures from bees and ants to dolphins and crows demonstrate intelligence.
My first master’s degree was in the field of psychometry, the study of testing and measurements. One of the things I learned very early was that there are different kinds of IQ tests. Our mentally challenged foster son Tim was tested at an early age and had a Stanford Benet IQ of 42. One-hundred was the average among humans. When Tim entered the public schools, he was tested with the Otis IQ test, and his score was 110. Why were the scores so different? The Otis was verbal so that it could be administered to many people at a time. Tim’s verbal abilities are very high because my wife read to him constantly when he was a child.
Tim knows the words, but his application skills are sometimes lacking. One of our favorite stories about Tim was when he was angry with me one time he yelled at me “… and you’re causing me to commit adultery!!!” He knew that adultery was bad, but he had no idea of why.
When I was a college student, there were psychologists who maintained that Afro-Americans were less intelligent than Caucasians, because they scored lower on IQ tests. The problem was that the tests were loaded with cultural distractors that were not a part of the students’ ethnic background. In my years of teaching science in inner-city schools, I saw no variation in intelligence among kids from different backgrounds. However, to this day I hear people say that Asians are superior in intelligence and Afro-Americans are inferior. For most of my 41 years of teaching physics at the secondary level, I fought with administrators and counselors who maintained that girls were less able in the physical sciences than boys. I know that isn’t true from experience.
The bottom line is that intelligence means different things to different people and IQ tests do not show who is important or valuable. The ability to solve problems is frequently considered to be a measure of intelligence, but problem solving is frequently a function of experience or trial and error–not reasoning. For anyone to attempt to use intelligence to tell who is human and who isn’t, who should have the right to vote and who shouldn’t, or who should be allowed to survive and who shouldn’t, is illogical and in violation of everything God has taught us.