Amazing Hypothesis: A Scientific Exploration of the Soul

Author: Francis Crick
Publisher:
Publish Date: 2004-01-01
Features: Forty years ago, Francis Crick, together with James Watson, discovered the structure of DNA, changing our understanding of the essence of life and thus immortalizing themselves in history. Now, Crick stands at the forefront of science again, turning his attention to the mysteries of human consciousness. Crick has decided to reveal the complexity of the brain and has chosen visual neurobiology as a breakthrough point. His scientific analysis of how the brain "sees" things is detailed, witty, and convincing. He also boldly explores some fundamental questions about human existence: Do we have free will? What makes us distinct from other animals and capable of perception? Does the soul truly exist? Or are we merely complex collections of neurons? In this pioneering and controversial work, Francis Crick challenges the fundamental foundations of modern science, philosophy, and religious thought. The question of the century: "What is consciousness?" Francis Crick is a genius who asks profound questions and gives astonishing answers. Among all the molecules in a cell, which are the source of life? His answer sparked a revolution among biologists. Among all the cells in the brain, which are the source of the soul? His exploration itself is a wondrous scientific story, just as dramatic as his exploration of the DNA molecule structure. The Astonishing Hypothesis is a remarkable work by an outstanding scientist. Amidst a light tone, the author's profound thoughts shine through the words. —Terry Sejnowski, Professor of Biology and Neuroscience at the University of California, San Diego This book attempts to explain the mysteries of consciousness through scientific methods. Here, I am not trying to give a straightforward answer to the question of consciousness. I would have liked to, but it seems too difficult at the moment. Of course, some philosophers believe they have already solved this problem, but in my view, their explanations do not fall within the realm of scientific truth. What I want to do is outline the nature of the consciousness problem and propose some suggestions on how to study it using experimental methods. What I will propose is a specific research strategy, not a fully developed theory. What I want to know is, what happens in my mind when I see something? Some readers may find this way of thinking somewhat disappointing. It deliberately avoids many of the discussions about consciousness that they would like to hear, especially how to define consciousness. You cannot win a battle simply by debating the meaning of the word "battle." You need a well-trained team, well-equipped weapons, and a winning strategy to effectively defeat the enemy. The same applies to solving a difficult scientific problem. This book is written for general readers who have a scientific interest in the consciousness problem but lack professional knowledge. This means I must explain the various aspects of consciousness in relatively simple terms. Even so, some readers may find certain parts of this book difficult to understand. To this end, I would like to say: Don't be discouraged by the unfamiliar arguments and the complexity of the experimental details. Just persist a little longer, or simply skim through these difficult chapters, as the general meaning is usually quite clear. Philosophers and scientists who study the mind-brain problem will clearly see that I have ignored many issues that interest them greatly. Although this approach is overly simplistic, I still hope they can learn something from this book, even if it's just in the chapters they know little about. I have tried to avoid distorting facts in these chapters due to the extreme diversity of nature, but it's not easy to do so in biology. Similarly, I cannot completely avoid distorting perspectives, as the consciousness problem is a research topic far from consensus. Without some initial biases, we cannot achieve any results. Readers will understand that at this moment, I am not particularly enthusiastic about functionalist or behaviorist views, nor do I lean toward the opinions of mathematicians, physicists, or philosophers. Perhaps I will realize my mistakes in thinking tomorrow, but today I do my best. Now is the time to think about the consciousness problem from a scientific perspective (and its relationship to the hypothetical eternal soul), and most importantly, it is the time to seriously and carefully design experiments to study the consciousness problem. This is exactly the insight this book provides. The following overview of the book will help guide readers through the jungle of brain science. This book is mainly divided into three parts. Part I consists of the following chapters: Chapter 1, I boldly state my "Astonishing Hypothesis." It summarizes my research method for the brain. To understand ourselves, we must know how neurons work and how they interact. Next, I compare the pre-scientific thoughts about consciousness and the soul with modern scientific knowledge of the universe. Finally, I briefly discuss some philosophical issues, such as reductionism, qualia, emergent behavior, and the reality of the world. Chapter 2 briefly outlines the general nature of consciousness (as discussed by William James a century ago and three modern psychologists) and links it to attention mechanisms and short-term memory. Then, I present the various hypotheses I made to solve this problem, explaining why I focused on a specific type of consciousness (visual consciousness) rather than other types, such as pain consciousness, self-consciousness, and so on. Chapter 3 explains why the common sense ideas most people have about how we see things are largely incorrect. Although we still don't know exactly what happens in our minds when we watch things, at least we can roughly outline the possible approaches to studying this problem using scientific methods. Chapters 4 and 5 describe some complex issues in visual perception psychology in considerable detail. These chapters will give readers an impression of what needs to be explained. The second part provides a brief overview of the brain, particularly the visual system. I don't want to give readers too many detailed descriptions, but rather provide some knowledge about how the nervous system is organized and how it works. I first outline the anatomy of the brain in Chapter 7, followed by a simple description of individual neurons in Chapter 8. Chapter 9 introduces the experimental methods commonly used in brain research (including cytology and molecular biology). The following two chapters outline the general properties of the visual system in higher primates. Chapter 12 explains how useful information can be obtained by studying patients with brain injuries. The second major part concludes with Chapter 13, which describes various theoretical models (called "neural networks") that can be used to simulate the behavior of units composed of a small group of similar neurons. The first two parts provide the necessary background knowledge for the third part. In the third part, I discuss various possible experimental methods for studying visual consciousness. None of these methods have yet led to the solution of the mystery, but some are promising. As a conclusion to the third part, Chapter 18 discusses some of the general controversies raised by my proposal. Finally, I use an afterword on "free will" as the epilogue to the book. To keep the text concise, I have provided less important arguments as footnotes and a glossary to explain the scientific terms used in the main text. Additionally, before the glossary, there are notes on common scientific units such as length, time, and frequency, because the distances and times at which brain activity occurs are much smaller than in everyday experience. For readers who wish to delve deeper into certain topics, I have provided a bibliography with further reading, some suitable for laypeople and others for experts. In most cases, I have added brief comments on their content. The superscript numbers in brackets in the main text refer to more technical references, mainly published in research journals (the references are listed in the appendix of this book, translator's note). This is only a small part of the relevant literature but provides a starting point for further specific exploration. I do not recommend these papers to lay readers, as most of them are too difficult and dry. I would like to pay high respect to readers who point out the shortcomings of this book. But I have little enthusiasm for general discussions. Many people have their own ideas about the consciousness problem, and many feel it is necessary to put them in writing. Please excuse me if I cannot read through all the letters from readers on this topic. My usual practice is to consider only those ideas published in reputable journals and by credible publishers. Otherwise, the chatter of others' suggestions would prevent me from thinking effectively. I will continue to explore these difficult problems. I hope this preface will pique the readers' interest.