Thought experiments have been used throughout history by great thinkers to expand our knowledge of ourselves and the world. In this course, you’ll explore fascinating thought experiments on subjects like personal identity and selfhood, special relativity and quantum mechanics, free will and moral responsibility, and what makes a life truly worth living. Join history’s great thinkers in The Power of Thought Experiments for an extraordinary journey into your own mind.
The Power of Thought Experiments
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01: How Thought Experiments Work
Consider two basic thought experiments, as they allow us to build hypothetical scenarios that stretch our imaginations and yield insights. Observe the power of thought experiments to reveal what is truly important, morally right, or what could or should be. Grasp how thought experiments have both distinct benefits and limitations, and how they stimulate and interact with our intuitions.
02: Saving Others or Letting Them Die
Look first at thought experiments involving the Prevention Principle—whether we are morally obligated to prevent something bad from happening if we can, and if so, if there are limits on this obligation. Then, grapple with scenarios contrasting deliberate killing with letting someone die. See how these problems invite us to think in challenging ways about fundamental moral issues.
03: What the Trolley Problem Reveals about You
The Trolley Problem, which Phillippa Foot first discussed in her 1967 paper that involved the two case studies of a trolley driver and a transplant, presents a difficult choice regarding saving lives in a deadly situation. Witness how the scenario raises thorny moral questions, noting that we tend to condone trading one life to save several in some situations while not in other situations. Observe that a seemingly moral choice becomes more complex if we make slight changes to the circumstances, forcing us to evaluate what we value and why.
04: Suppose You’re Impartial; Suppose You Care
Here, look at thought experiments that consider the value of being impartial versus partial, when interacting with others in important ways. Referencing Confucian thought, examine whether it’s morally preferable to treat everyone equally or to care for some more than others. Critically, investigate whether morality, and impartiality itself, may require us to be grounded in partial relationships.
05: Unmasking the Hidden Pitfalls of Testimony
Now delve into thought experiments in social epistemology—the study of knowledge in social settings. Think through common strategies we use to deal with minor social disagreements, and what happens when a disagreement is extreme. Then, take account of how testimony is one of our most fundamental sources of knowledge, yet it can be problematic when its credibility is either under- or over-valued.
06: Can You Time-Travel and Change the Past?
The “grandfather paradox” is a thought experiment that obliges us to think rigorously about what traveling back in time would mean. Assuming time travel is possible, come to grips with whether the past could feasibly be changed. In doing so, observe that this problem hinges on what it means to be able to do something, which in turn hinges on factors in the environment or context.
07: Paradoxes as Mental Workouts
As a lead-in to paradoxical thought experiments, consider the nature of the paradox as a situation that proceeds from seemingly acceptable reasoning to a contradictory or absurd conclusion. Then, wrestle with two classic paradoxes, the “surprise test paradox” and “the stone paradox,” which propose complicated problems and function as powerful tools for teaching and sharpening our thinking.
08: What Newcomb’s Paradox Says about Decisions
“Newcomb’s paradox” is a scenario involving two possible choices where the goal is to make the most profitable choice in the face of equally compelling arguments for each choice. Dig deeply into underlying principles regarding the two choices, looking rigorously at the issues to clarify which is the best choice. Observe what the paradox reveals about two distinct approaches to making a rational decision.
09: Stories as Thought Experiments
Compare the features of fictional stories and thought experiments with those of actual scientific experiments to see whether we can learn meaningful things about the world through the medium of fiction. Grasp how thought experiments allow us to assess what might happen in given conditions we can’t experimentally produce, allowing us to access conditions of the world we couldn’t otherwise explore.
10: Einstein’s Revolutionary Thought Experiments
Discover how Einstein used thought experiments to work out some of his seminal theories, highlighting his theory of special relativity, which shows how speed affects time and space. Witness how he used one thought experiment in developing the theory, and a second one to explain a critical element of it, the relativity of simultaneity, which illuminates how we perceive time and simultaneous events.
11: Galileo’s and Schrödinger’s Thought Experiments
Encounter some of the most famous thought experiments in the history of science. Among these, learn about Galileo’s thought experiment which challenges Aristotle’s view that the speed of falling bodies is proportional to their weight. Also, investigate Schrödinger’s Cat, his thought experiment which brilliantly demonstrates a serious conceptual problem within quantum mechanics.
12: What Makes Identity the Same over Time?
Explore the subject of identity by examining how we think about material objects. Using thought experiments from history, look at how we assign identity to physical objects such as ships and chariots. In the process, assess whether we consider parts to make up, or be identical to, a whole; whether a whole exists independent of its parts; and whether, in fact, wholes truly exist at all.
13: Mind Swapping and Personal Identity
In the first of three lectures on personal identity, study thought experiments that ask us to think deeply about our sense of selfhood. Through thought experiments involving mind/body swapping and teletransportation, investigate how we envision personal identity across time—whether we define our identity by psychological continuity over time or in terms of facts about the biological, bodily self.
14: Who Are You after a Brain Transplant?
Zero in further on identity, with thought experiments proposing scenarios where your brain is transplanted into one or more other bodies. Investigate how philosophers use these thought experiments to reveal whether personal identity or physical survival is more important to us, and whether the criteria for personal identity we use is different from what we tend to think it is.
15: Who Are You Right Now?
Using thought experiments from historic Islamic, Jain, and Daoist philosophers, investigate whether we identify the self as necessarily related to the body, or as somehow independent. From there, consider the case of “Otto’s notebook,” a modern thought experiment that asks whether the mind, and, therefore, our practical identity or self, can extend beyond the skin into the external world.
16: Exploring the Mysteries of Consciousness
In approaching the subject of consciousness, examine how we study the human mind, and, particularly, the question of whether objective study of the mind can penetrate or understand subjective experience. Then, study some famous thought experiments that make the case that it can’t. Whether or not we agree with their conclusions, grasp how thought experiments of this kind push the limits of our knowledge.
17: When Are You Morally Responsible?
Thought experiments concerning moral responsibility allow us to finely hone our thinking about the conditions under which we’re responsible morally for our actions. Consider scenarios that highlight the traditional view that moral responsibility requires the ability to do otherwise. From there, work through some important thought experiments that convincingly call this view into question.
18: How Luck Changes Moral Thought Experiments
How do circumstances beyond a person’s control affect their moral responsibility for their actions? Immerse yourself in thought experiments that work with this issue, looking at different scenarios that consider what constitutes genuine or true agency. Also explore Derk Pereboom’s thought experiments on the role of historical factors in assessing personal freedom and responsibility.
19: Challenging Whether You Have Free Will
Dig deeply into the question of whether our actions and choices result from free will, or if they’re determined by other causes. Study how various thinkers have approached this, with thought experiments that probe the processes and factors involved in making choices. Look into determinism and indeterminism in theories of free will, and whether free will necessitates an indeterministic universe.
20: Suppose You’re Immortal. What Do You Value?
Imagine three scenarios: First, picture hooking up to a machine that can give you any experience you want. Next, consider taking a pill that makes you immortal. Finally, picture your life repeating on an endless loop. What are the implications of having anything you want and living forever? And what perspective does thinking these alternative realities through give you on how to live your life?
21: Visit Twin Earth to Explore Meaning
Through some famous thought experiments, look at two fundamental aspects of meaning: reference (the object a word refers to) and sense (what a word or thought expresses). By visiting an imaginary “twin Earth,” investigate the roles played in meaning by what we think as well as by aspects of the world itself. Then, consider how we arrive at the meaning of the term “morally right.”
22: How Do You Know When You Know Something?
Study noted thought experiments that grapple with how we define knowing something, as opposed to believing or supposing it. Delve into “Gettier cases,” which challenge the traditional view that knowledge is “justified true belief.” Then, investigate whether knowing something depends on context. Finally, study thought experiments that contrast knowledge with understanding.
23: How to Create Civilization from Chaos
Imagine the “state of nature,” the human world before laws or governments, and weigh philosophers’ views of how to resolve inevitable conflict. Consider the “prisoner’s dilemma,” a problem which highlights the challenge of getting self-interested people to cooperate for their own good. See how thought experiments in political philosophy offer tools and insights for negotiating social harmony.
24: Thought Experiments as a Way of Life
Conclude the course with a return to ethics. First, look at “dilemma tales,” narratives that present a difficult or agonizing choice. Ponder thought experiments which separate what is morally right from what is just, two things which normally seem to go together. Grasp how we can use thought experiments as a practice to examine our everyday attitudes in-depth and to clarify what we really think.