Brains of more intelligent people also seem to operate faster than the brains of those who are less intelligent. Researchers suggested that more intelligent brains need to use less capacity. Haier, Siegel, Tang, and Abel (1992) analyzed data showing that people who were more intelligent showed less brain activity than those with lower intelligence when they worked on a task. There is some evidence that brains of more intelligent people operate more efficiently than the brains of people with less intelligence. It is possible that growing up in a stimulating environment that rewards thinking and learning may lead to greater brain growth (Garlick, 2003), and it is also possible that a third variable, such as better nutrition, causes both brain volume and intelligence. It is important to remember that these correlational findings do not mean that having more brain volume causes higher intelligence. Studies that have measured brain volume using neuroimaging techniques find that larger brain size is correlated with intelligence (McDaniel, 2005), and intelligence has also been found to be correlated with the number of neurons in the brain and with the thickness of the cortex (Haier, 2004 Shaw et al., 2006). There is some truth to the idea that smarter people have bigger brains. Speed and efficiency of neural transmission.The brain processes underlying intelligence are not completely understood, but current research has focused on four potential factors: The concept of intelligence relates to abstract thinking and that includes our abilities to acquire knowledge, to reason abstractly, to adapt to novel situations, and to benefit from instruction and experience (Gottfredson, 1997 Sternberg, 2003). These questions include how many types of intelligence there are, the role of nature versus nurture in intelligence, how intelligence is represented in the brain, and the meaning of group differences in intelligence. Psychologists have long debated how to best conceptualize and measure intelligence (Sternberg, 2003).
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