12. Intelligence: How Do We Know You Are Smart? (audio only)

TL;DR

Both genetics and environment play a significant role in determining intelligence, with evidence of changes in IQ over time and the impact of different environments on IQ scores.

Transcript

The following content is provided by MIT OpenCourseWare under a Creative Commons License. Additional information about our license and MIT OpenCourseWare in general is available at ocw.mit.edu. JEREMY WOLFE: The midterm marks an interesting dividing point in the subject material of the course. It's not an absolute division by any stretch of the ima... Read More

Key Insights

• 🧑‍🏭 Average intelligence is not solely determined by genetics, as environmental factors also contribute significantly.
• 💯 IQ scores can change over time due to various factors, including improvements in nutrition and education.
• 👯 The perception of intelligence is often above average due to a positivity bias, with people believing they are smarter than they actually are.

Questions & Answers

Q: Is intelligence solely determined by genetics?

No, genetics and environment both play a significant role in intelligence. While genetics provide a baseline, environmental factors can influence IQ scores.

Q: How do IQ scores change over time?

IQ scores have been shown to increase over time in some populations, known as the Flynn effect. This may be due to changes in environmental factors such as nutrition and education.

Q: Can IQ scores be improved through intervention?

Yes, studies have shown that providing an enriched environment, such as early education programs, can positively influence IQ scores. However, the effects may not be permanent without ongoing support.

Q: Why do individuals tend to perceive themselves as more intelligent than average?

This phenomenon, known as the positivity bias, is a cognitive bias that causes individuals to view themselves more positively than reality. People tend to believe they are above average in intelligence and other desirable traits.

Summary & Key Takeaways

• The midterm in an intelligence course marks a shift in focus from measuring average intelligence to understanding the variation in IQ scores.

• Intelligence is not solely determined by genetics, as environmental factors also influence IQ scores.

• The perception of one's intelligence is often higher than average due to a 'positivity bias,' with depressed individuals being an exception.

• Key insights: IQ scores are influenced by genetic and environmental factors, including the interaction between the two; IQ scores can change over time due to various factors; and the concept of 'average' intelligence is subjective.