What Is the Relationship Between Working Memory and Intelligence?

The best answer to any question.
June 17 2013 3:16 PM

What Is the Relationship Between Working Memory and Intelligence?

A model of Einstein's brain
The brain (a model of Einstein's brain is pictured above) is generally poorly understood, but there is a relationship between intelligence and memory

Photo by Miguel Medina/AFP/Getty Images

pking

This question originally appeared on Quora.

Answer by Paul King, computational neuroscientist:

Advertisement

Working memory capacity is highly correlated with general intelligence, however the exact relationship is the subject of some debate.

Cognitive psychologists define "general intelligence" in terms of the so-called "g factor." The g factor is a statistical measure of an imaginary aptitude that correlates across numerous measures of intelligence, including: verbal ability, foreign language learning, math, abstract reasoning, problem solving, music, reading comprehension, and others. (see: Fluid and crystallized intelligence, g factor (psychometrics))

Working memory capacity may be the most highly correlated component of general intelligence, but it is not all of it. (Sources: "Working memory capacity and its relation to general intelligence" by Conway ARA , Kane MJ , Engle RW, Trends in Cognitive Sciences, 2003, and "Working memory and intelligence: The same or different constructs?" by Ackerman PL, Beier ME, Boyle MO, Psychological Bulletin, 2005.)

pkingneuro1
pkingneuro2

These diagrams give a sense of the relationship between general intelligence ("g") and working memory (top), as well as some of the components proposed to underlie working memory (bottom)

While the nature and functioning of general intelligence in the brain is murky and only poorly understood, there are several proposed components that have emerged as recurring themes:

  • Short term memory (STM) capacity: the ability to maintain ready access to information: 7 ± 2 items
  • Working memory (WM) capacity: integrates attention, executive control, and multiple short term memory systems
  • Attention: the ability to block out distractions and reduce memory interference, among other effects
  • "Set shifting" and "cognitive flexibility": the ability to recognize a change in environmental context and adapt behavioral rules appropriately. The opposite of this ability is "perseveration," which is staying stuck in a pattern even when it no longer makes sense.

The prefrontal cortex primarily (but also other brain regions) has emerged as the principal brain area responsible for these capacities. (Source: "The role of prefrontal cortex in working-memory capacity, executive attention, and general fluid intelligence: An individual-differences perspective," by Kane MJ and Engle RW,
Psychonomic Bulletin & Review, 2002.)

To tease apart the neural capacities that may underlie intelligence, cognitive scientists devise tests that measure each proposed capacity in relative isolation. Other studies using fMRI or neural recordings attempt to correlate them with brain areas, neural activity, and each other.

More questions on cognitive science:

TODAY IN SLATE

Medical Examiner

The Most Terrifying Thing About Ebola 

The disease threatens humanity by preying on humanity.

I Bought the Huge iPhone. I’m Already Thinking of Returning It.

Scotland Is Just the Beginning. Expect More Political Earthquakes in Europe.

Students Aren’t Going to College Football Games as Much Anymore

And schools are getting worried.

Global Marches Demand Action on Climate Change

Politics

Blacks Don’t Have a Corporal Punishment Problem

Americans do. But when blacks exhibit the same behaviors as others, it becomes part of a greater black pathology. 

Why a Sketch of Chelsea Manning Is Stirring Up Controversy

How Worried Should Poland, the Baltic States, and Georgia Be About a Russian Invasion?

  News & Politics
Weigel
Sept. 20 2014 11:13 AM -30-
  Business
Business Insider
Sept. 20 2014 6:30 AM The Man Making Bill Gates Richer
  Life
Quora
Sept. 20 2014 7:27 AM How Do Plants Grow Aboard the International Space Station?
  Double X
The XX Factor
Sept. 19 2014 4:58 PM Steubenville Gets the Lifetime Treatment (And a Cheerleader Erupts Into Flames)
  Slate Plus
Tv Club
Sept. 21 2014 1:15 PM The Slate Doctor Who Podcast: Episode 5  A spoiler-filled discussion of "Time Heist."
  Arts
Brow Beat
Sept. 21 2014 2:00 PM Colin Farrell Will Star in True Detective’s Second Season
  Technology
Future Tense
Sept. 19 2014 6:31 PM The One Big Problem With the Enormous New iPhone
  Health & Science
Bad Astronomy
Sept. 21 2014 8:00 AM An Astronaut’s Guided Video Tour of Earth
  Sports
Sports Nut
Sept. 18 2014 11:42 AM Grandmaster Clash One of the most amazing feats in chess history just happened, and no one noticed.