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Empty old opera gala theater stage and red velvet curtains

How Philosopher John Locke Turned Reality Into Theatre

His “little theater in the mind” concept means that you can’t even know that nature exists. It may just be a movie that’s being played in front of your eyes

Neurosurgeon Michael Egnor did a recent podcast with Arjuna Das at Theology Unleashed, “where Eastern theology meets Western skepticism.” In this segment, they discuss the way in which theories of perception that began in the early modern era (17thcentury on) led to doubt about our ability to perceive reality. Here is a partial transcript and notes for the forty-seven to fifty-seven minute mark: The Cartesian theater of the mind Arjuna Das: This is one of [the Vedic] arguments against the brain explaining consciousness. By the time it reaches the end stages of its processing, you have about 20 pixels worth of data. So the information that comes from your senses gives you reference points and then your sensors actually are…

probability likelihood

How Bayes’ Math Rule Can Counter Unreasonable Skepticism

Mathematics is much more interesting if we know a bit about the players and their positions

Yesterday, we discussed the importance of Bayes’ rule in statistical reasoning. We used the example of a person who goes for a battery of screening tests and comes up positive for HIV. Let’s say she is surprised (and alarmed) because she is not at any known risk for HIV. But, it turns out, the risk of false positives for the test is several times greater than the incidence of HIV in the population. In that case, it is reasonable for her to suspect—on a statistics science basis, not just wishful thinking—that the test is a false positive. The formula we used is part of Bayesian reasoning, originally developed by an eighteen-century British clergyman and mathematician Thomas Bayes (1702–1761), but now…