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The Master and His Emissary

The Master and His Emissary is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand The Master and His Emissary rather than just read about it. In short: The Master and His Emissary: The Divided Brain and the Making of the Western World is a 2009 book written by the British psychiatrist Iain McGilchrist that deals with the specialist hemispheric functioning of the brain. The differing world views of the right and left brain (the "Master" and "Emissary" in the title, respectively) have, according to the author, shaped Western culture since the time of the ancient Gree…

The Master and His Emissary — main illustration
The Master and His Emissary — illustration

Key takeaways

  • The Master and His Emissary belongs to biology; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect The Master and His Emissary to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of The Master and His Emissary from memory before moving on to harder problems.

Reference excerpt

The Master and His Emissary: The Divided Brain and the Making of the Western World is a 2009 book written by the British psychiatrist Iain McGilchrist that deals with the specialist hemispheric functioning of the brain. The differing world views of the right and left brain (the "Master" and "Emissary" in the title, respectively) have, according to the author, shaped Western culture since the time of the ancient Greek philosopher Plato, and the growing conflict between these views has implications for the way the modern world is changing. The Master and His Emissary received mixed reviews upon its publication. Some critics praised the book as being a landmark publication that could alter readers' perspective of how they viewed the world; other critics claimed neurological understanding of hemispheric differences falls short of supporting the sweeping conclusions the book draws about Western culture. The Master and His Emissary was shortlisted for the 2010 Bristol Festival of Ideas Book Prize, and was longlisted for the Royal Society 2010 Prize for Science Books.

Background and influences In an interview with Frontier Psychiatrist, McGilchrist cites two main influences on his work: the psychiatrist John Cutting and the psychologist David McNeill. McGilchrist states: "What I began to see – and it was John Cutting's work on the right hemisphere that set me thinking – was that the difference lay not in what they [the two hemispheres] do, but how they do it." In the same interview, the author explains: "Some very subtle research by David McNeill, amongst others, confirms that thought originates in the right hemisphere, is processed for expression in speech by the left hemisphere, and the meaning integrated again by the right (which alone understands the overall meaning of a complex utterance, taking everything into account)."

Synopsis The 608-page book is about the specialist hemispheric functioning of the brain. The differing world views of the right and left brain (the "Master" and "Emissary" in the title, respectively) have, according to the author, shaped Western culture since the time of the ancient Greek philosopher Plato, and the growing conflict between these views has implications for the way the modern world is changing. The book is divided into an introduction, two parts and a conclusion. In the introduction, McGilchrist states that "there is, literally, a world of difference between the [brain] hemispheres. Understanding quite what that is has involved a journey through many apparently unrelated areas: not just neurology and psychology, but philosophy, literature and the arts, and even, to some extent, archaeology and anthropology."

Part One: The Divided Brain

In "The Divided Brain", McGilchrist digests study after study, replacing the popular and superficial notion of the hemispheres as respectively logical and creative in nature with the idea that they pay attention in fundamentally different ways, the left being detail-oriented, the right being whole-oriented. These two modes of perception cascade into wildly different hemispheric personalities, and in fact reflect yet a further asymmetry in their status, that of the right's more immediate relationship with physical bodies (our own as well as others) and external reality as represented by the senses, a relationship that makes it the mediator, the first and last stop, of all experience.

Part Two: How the Brain Has Shaped Our World In the second part, "How the Brain Has Shaped Our World", the author describes the evolution of Western culture, as influenced by hemispheric brain functioning, from the ancient world, through the Renaissance and Reformation; the Enlightenment; Romanticism and Industrial Revolution; to the modern and postmodern worlds which, to our detriment, are becoming increasingly dominated by the left brain.

… excerpt ends here. Continue reading the full article.

Illustrations

The Master and His Emissary: Superior-lateral view of the brain, showing left and right hemispheres.
Superior-lateral view of the brain, showing left and right hemispheres.

Worked examples

Example 1 — a first encounter with The Master and His Emissary

Start with the simplest possible case. Write down what The Master and His Emissary claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to The Master and His Emissary before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about The Master and His Emissary ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of The Master and His Emissary

In research
The Master and His Emissary appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses The Master and His Emissary in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
The Master and His Emissary is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2009 non-fiction books, Neuroscience books, Philosophy of mind literature, so understanding it makes those chapters shorter.
In everyday life
Look for The Master and His Emissary outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study The Master and His Emissary in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what The Master and His Emissary means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain The Master and His Emissary out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is The Master and His Emissary in simple terms?

The Master and His Emissary: The Divided Brain and the Making of the Western World is a 2009 book written by the British psychiatrist Iain McGilchrist that deals with the specialist hemispheric functioning of the brain. The differing world views of the right and left brain (the "Master" and "Emissa…

Why does The Master and His Emissary matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study The Master and His Emissary?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on The Master and His Emissary.

Tags

  • 2009 non-fiction books
  • Neuroscience books
  • Philosophy of mind literature
  • Psychology books
  • Yale University Press books

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