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A Thousand Brains

A New Theory of Intelligence

Jeff Hawkins

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A Thousand Brains
The Neocortex+
The Prediction Machine+
The Thousand Brains Paradigm+
Reference Frames+
Democracy in the Brain+

Quiz — Test Your Understanding

Question 1 of 6
According to the text, what is a primary puzzle regarding the neocortex that the 'thousand brains theory' attempts to solve?
  • A. It is much smaller in humans compared to other mammals despite our higher intelligence.
  • B. It has a highly uniform structure of cortical columns despite governing vastly different functions like sight, math, and language.
  • C. It operates completely independently from the older, reptile brain known as the limbic system.
  • D. It is divided into rigidly specialized functional modules that cannot adapt to damage.
Question 2 of 6
How does the brain refine its model of the world, according to the 'brain in a vat' analogy?
  • A. By passively absorbing sensory data until a complete, error-free picture is formed.
  • B. By relying entirely on genetic memories passed down through DNA to predict the future.
  • C. By making predictions about sensory input and updating the model whenever a prediction is wrong.
  • D. By shutting down sensory inputs periodically to process complex abstract thoughts in the dark.
Question 3 of 6
How does Jeff Hawkins's view of the brain differ from the traditional neuroscientific view of functional modules?
  • A. He argues that each cortical column has its own sensory and motor connections, acting as an independent mini-brain.
  • B. He believes the brain has strictly separated sensory and motor cortices that never directly communicate.
  • C. He suggests that primitive features like edges and colors are processed in the limbic system rather than the neocortex.
  • D. He proposes that human brains use a completely different learning algorithm than the brains of other mammals.
Question 4 of 6
According to the theory, how do cortical columns store models of objects and abstract concepts?
  • A. By capturing high-resolution photographic memories of objects and storing them in the limbic system.
  • B. By utilizing reference frames, a mapping mechanism that originally evolved to help simple organisms navigate physical space.
  • C. By assigning each object to a single, specialized neuron that fires only when that specific object is present.
  • D. By translating all sensory data into a binary code that is processed exclusively by the brain's motor cortex.
Question 5 of 6
How does the thousand brains theory explain higher-level cognition, such as thinking about mathematics or language?
  • A. As a form of navigation and traversal through an abstract space of concepts, similar to moving through a physical environment.
  • B. As a purely logical process that bypasses the cortical columns and occurs entirely in the older reptile brain.
  • C. As a result of the brain creating new, specialized types of neurons that do not exist in other mammals.
  • D. As an illusion generated by the sensory cortex when it is deprived of physical movement.
Question 6 of 6
If there are thousands of independent models in the brain, how do humans experience a single, unified perception of reality?
  • A. A central 'master column' dictates the final perception to the rest of the brain.
  • B. The limbic system filters out all but one of the models before they reach consciousness.
  • C. Long-distance 'voting neurons' connect different columns, allowing them to tally their interpretations and reach a consensus.
  • D. The brain switches rapidly between different models, creating the illusion of a single continuous experience.

A Thousand Brains — Full Chapter Overview

A Thousand Brains Summary & Overview

A Thousand Brains (2021) explores the fundamental nature of intelligence. It poses the theory that the brain is a collection of thousands of mini-brains, each generating and refining their own predictions. It also delves into the implications of this theory for artificial intelligence and our understanding of consciousness.

Who Should Listen to A Thousand Brains?

  • Fans of neuroscience who are interested in the latest research
  • Anyone curious about how humans think and learn
  • Those ready for an in-depth guide to one of life’s great mysteries

About the Author: Jeff Hawkins

Jeff Hawkins is a neuroscientist, entrepreneur, and computing pioneer. He cofounded Palm Computing and Handspring, where he invented the PalmPilot and the Treo smartphone. He now runs Numenta, a company and research lab which studies how the brain works, and is coauthor of the book On Intelligence. 

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