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A Life-Span View of Intelligence: Definition & Aspects

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  • 0:01 Intelligence
  • 1:27 Multidimensional
  • 2:44 Multidirectional
  • 3:59 Plasticity
  • 4:55 Inter-Individual Differences
  • 5:44 Lesson Summary
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Lesson Transcript
Instructor: Devin Kowalczyk

Devin has taught psychology and has a master's degree in clinical forensic psychology. He is working on his PhD.

In this lesson, we will explore a handful of topics that are often relevant to the research of intelligence. We'll also take a look at how intelligence changes as we age.

Intelligence

When I was younger, I wished to be the smartest person in the world. Unfortunately, it didn't happen. I guess I'll just settle on eating the brains of the smartest people and hope I absorb their intelligence. Science works like that, right?

Intelligence is loosely defined as an innate ability to learn and retain information to deal with problems or situations. Intelligence is one of those things we have defined, but because we are not looking at something solid, like height, weight or reaction speed, it leads to there being multiple ways of interpreting it. Some people look at intelligence as individual aspects, like verbal abilities, processing speed and working memory. Others argue that all of these are typically linked and that you are merely measuring different angles of a general intelligence.

What we can easily say, even in lay terms, is that inter-individual variability is high, with some people being great speakers, others understanding complex math with ease and others still looking for what they're good at. When we look at intelligence over a lifetime, we see four main aspects being emphasized: multidimensional, multidirectional, plasticity and inter-individual variability. Let's look at each of these individually.

Multidimensional

We hinted at the idea that intelligence is either made up of components, each working together, or some general intelligence matrix. 'Multidimensional' means intelligence consisting of different aspects derived from experiential, environmental and genetic influences. How this is divided up depends on the researcher.

What we can say is that the dimensions measured can vary slightly depending on those experiential, environmental and genetic factors. For example, people who have the college experience often have higher and more sophisticated vocabularies. People who grew up with lead paint chips in their environment often had developmental issues. And there are families with higher rates of brain issues, like Alzheimer's disease.

Let's link all of these things together with a simple story. Albert grew up in a good environment, receiving a decent amount of attention and without environmental toxins. He did spend a year in Europe living with some friends, and he picked up a smattering of another language. When he returned to his home, he was nearly bilingual. In addition, because of his time living abroad and using a translation guide, he learned to think and do things faster, giving him an increase in his processing speed.

Multidirectional

Based on the idea that intelligence consists of multiple dimensions working together, the idea of multidirectional change means different cognitive dimensions will alter, over time, independently or dependently of each other. Here we have two things: first, that individual dimensions, like verbal skills, processing speed and working memory, will increase or decrease over time. Sometimes they will go up and down or down then up; there is not a single direction they will go. Secondly, sometimes two can become linked, like improving one's verbal skills by reading more leads to faster processing speeds.

Albert is getting older. His verbal skills were average because he worked as an office manager, so he needed to communicate well. As he got older, he started taking manager courses that taught him how to increase his vocabulary and about placing more emphasis on accurate information. This means if Albert had his IQ tested, his verbal dimension would increase because of the training and exposure, and his testing speed would decrease because he spends more time making sure he has the correct answer.

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