Factors Affecting Human Intelligence

Most scientists agree that genes have some influence over general intelligence and special aptitudes in such activities as athletics, mathematics, music, and science. But genes are not the only factor involved in producing these characteristics.

The brain is one of the most complex, unknown organs of the human body. Researchers often break down the characteristics of the brain to whether tendencies are achieved through nurtured environments or the inheritability of genetics. Intelligence is one of the most controversial topics when it comes to deciding whether environment or genetics are most influential. Many argue that intelligence is based on environmental factors and the unique ability to work hard, but fail to realize the essential cognitive qualities concerning what truly defines intelligence. Although some may consider this trait as based on environment, intelligence is a cognitive attribute established by the nature of genetics.

Intelligence by definition is “the ability to acquire and apply knowledge and skills” (Oxford Dictionary, 2014). However, many psychologists argue that there is no standard definition of ‘intelligence’, and there have been many different theories over time as psychologists try to find better ways to define this concept (Boundless 2013). While some believe in a single, general intelligence, others believe that intelligence involves multiple abilities and skills. Another largely debated concept is whether intelligence is genetically determined and fixed, or whether is it open to change, through learning and environmental influence. This is commonly known as the nature vs. nurture debate.

The debate concerning the nature of the relationship between race and intelligence has been highly contested by psychologists for many years. With the emergence of genetic research in recent times, some clarity has been provided, however, many unanswered questions still remain. This essay discusses the implications of IQ test scores and the potentially misleading information they generate when administered to non-Western individuals. Although it is argued that race is a dynamic social construct and therefore not scientifically sound, this essay will explain why considering context-specific information about an individual is vital when assessing their intelligence due to the substantial roles environmental factors play in the learning

One of the main purposes of the eugenics movement was to attempt to control the level of intelligence in the human race. This is not completely possible, however, as all genes are linked to other genes, and intelligence is affected by many more than just the one gene (Agar, 2006). In contrast to Galton’s theory, intelligence is not actually completely hereditary. Between 47 and 58% of intelligence lies in DNA, and the rest is based on environmental factors (Steen, 1996). Many types of intelligence tests have been created to measure the level of intelligence in humans. Defining intelligence in itself is a difficult task, as there are

There is also scientific opinion that intelligence is attributed to DNA passed on from your parents. ( Plomin , Spinath 2004)

There is a relationship between intelligence and culture because intelligence is culturally shaped and defined and some cultures support and identify it as very vital in the context of social and ecological aspects. In the early years, there was a bias towards intelligence tests because they used English language and culture. The formation of Wesler Adult Intelligence Scale, Fourth Addition (WAIS,IV) in 2008 by David Wesler was meant to minimise the bias. According to Westen, Burton and Kowalski (2006), intelligence assists human beings to take control of their lives and it varies cross culturally because the power dynamics differ in each society and this leads to differences in behaviour and line of thinking. These authors describe intelligence as multifaceted, functional and can be defined by culture because it is universal and studying intelligence using different culture as a sample that can be used to question Western ideas about intelligence with some emphasis on the assessment of skills and abilities using culturally appropriate methods (Benson, 2003)

The nature versus nurture debate is the scientific, cultural, and philosophical debate about whether human culture, behavior, and personality are caused primarily by nature or nurture. Within the field of psychology, this so-called nature-nurture debate, is very often associated with the issue of intellectual quotient, better known as IQ. In the past psychologists have argued that the way in which a child developed was based solely on nature, genetic or hormone-based behaviors, or nurture, environment and experience. Nevertheless, this extreme way of thinking is now long outdated, and it is clear that both nature and nurture have great effect on our intellectual development. The question now lies in just how much impact each has on an

Over time intelligence has been thought to have a major impact on many people’s success throughout their future. In order to accomplish many goals and tasks in life

The age old debate of nature and nurture continues to this day; however, one notion that is widely accepted is that intelligence is jointly influenced by genetic and nongenetic factors (Plomin & Asbury, 2005, p. 88). Genetics narrowly refers to the DNA differences that are inherited by humans; genetics does not refer to the DNA which is common throughout all humans or the DNA mutations that may occur with the exception of sex cells (Plomin & Petrill, 1997, p.55). How is intelligence within humans affected by genetic factors? This research paper compiles information from four research articles in order to provide insight into the affects that genetics may have on intelligence in humans. The conclusion will provide a summary of the points covered

Once a person has an idea of what intelligence is and what it means, a final thought one might consider is what influences are responsible for the different types of intellect. Two possible influences are genetics and the environment in which one lives, with genetics being the strongest influence (Santrock, 2009, pg. 302). Most researchers agree that a person’s genetics and environment interact with one another to influence the outcome of that person’s intelligence (Santrock, 2009, pg. 302). Genetic influences should be pretty obvious, so there should be no need to explain it; a person’s environment on the other hand, can involve several factors. An environment can consist of elements such as a person’s school, home, friendships, family relationships, and workplaces. All of these components factor in to influence a person’s intelligence.

While this assumption is accepted by a majority of geneticists and behavioral scientists, there is great disagreement on the degree of influence each contributes. Arguments for environmental influences are compelling; at the same time there is growing evidence that genetic influence on intelligence is significant and substantial (Eyesenck, 1998; Mackintosh, 1998; Plomin, 1994; Steen, 1996). The purpose of this paper is to explore the question: "How is intelligence influenced by heredity and environment?"

Debates on the relationship between birth order and intelligence have been remaining controversial. Birth order is considered as a person's ranking by age among his or her siblings. There have been numerous researchers studying about this subject to find whether firstborns generally have a higher IQ scores than their siblings. Some scientists conclude that birth order strongly influents intelligence; however, others oppose to this, claiming that birth order has no effect on intelligence. In this paper, my study deals with the birth order effects on intelligence.

Human intelligence is complex and where it lies within the nature and nurture debate, has divided the world of psychology for many years. Nature argues intelligence is influenced by biologically inherited genes which are passed from generation to generation. However, nurture argues intelligence is learned and is influenced by environmental factors and social interactions. This essay will examine how nature and nurture are applied to intelligence.

Intelligence is used by everyone to help them in everyday life. Where people get their intelligence, however, is debatable. A person is born with an amount of inherited intelligence; this intelligence is considered nature, genetic, or heredity. Then there is intelligence that comes from the ability to learn from experience; this intelligence is impacted by nurture or the environment. It is known that both genetic and environmental factors determine intelligence, but the subject is controversial among professionals. Does nature or nurture have a bigger impact on intelligence? Is it true that some people are born with high intelligence, but are limited by their environment? Given the proper tools, can a person increase their intelligence? How accurate are IQ tests?