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Don Salmon's avatar

Fascinating reflections, though in Tibetan Buddhism and many schools of Vedanta and Tantra, there's very different non-technological puzzle that can lead us into the arms of the Beloved (as the Sufis refer to God).

THOUGHT EXPERIMENT:

By definition, a thought experiment is something that is (almost always) impossible. I doubt it anyone told Albert Einstein, after he shared his imaginary journey on a light beam traveling at unimaginable speed, "You know Al, this is actually impossible."

So I'm going to invite you to imagine another impossible scenario, and see where it takes you (if you're willing to take the red pill).

We are going to view the experience of Josh. Josh is a physicalist, and he is also a master physicist, biologist, psychologist, mathematician and neuroscientist.

Imagine that, like Neo in The Matrix, Josh is starting to have an uncomfortable feeling that maybe, just maybe, right now and here, he is dreaming. We know that in fact he IS dreaming, and - here's the impossible part - somehow his subconscious mind (or maybe it was NOT his subconscious mind?) has created a perfect replica of the waking state universe.

As a physicalist, when Josh sets out to determine whether he is dreaming or not, he figures that he should be able to perform some kind of scientific experiment which will determine for him whether or not he is in a dream (ie the objects around him are literally "made' of consciousness") or what he sees are - as he believes things to be, as a physicalist - entirely independent of any kind of field of consciousness.

NOTE: BEFORE I GO ON, IN ORDER TO GET A REAL VISCERAL FEEL FOR THIS. I'VE BEEN IN DREAMS WHERE I COULDN'T TELL IF I AM AWAKE OR DREAMING (the technical term in dream literature for this is "false awakening" - you think you've woken up and then realize you're still in a dream; this often takes place 4 or 5 times in a row, until you get to a point where you are not sure if you're in a dream or awake. People hear this and simply don't believe it's not very very easy to tell they're dreaming - because dreams are, well "dreamy" SO IT'S IMPORTANT FOR YOU TO GET THIS IN ORDER TO REALLY FEEL YOUR WAY INTO JOSH'S DILEMMA:

WHAT DOES IT FEEL LIKE WHEN YOU ARE NOT SURE IF YOU'RE DREAMING OR NOT?

LOOK AROUND YOU, LOOK AT THE SIGHTS, LISTEN TO THE SOUNDS, FEEL YOUR BODY...... NOTICE THE CLARITY OF YOUR MIND, THE VISCERAL SUBSTANTIALITY OF YOUR INSTINCTIVE FEELINGS AND EMOTIONS:

WHAT DOES IT FEEL LIKE IF YOU'RE NOT SURE YOU'RE DREAMING OR NTO?

this is what it feels like - EXACTLY the way you feel now. NO DIFFERENCE. But no doubt, you're still going to be convinced that the dream reality could not possibly be exactly the same as the waking reality, so let's get back to the thought experiment.

Josh, as a physicalist, decides he is going to perform some scientific experiments which - though technically he understands enough philosophy of science to know that all experiments are essentially metaphysically neutral - he very strongly believes should, by inference, give him evidence of whether or not there are purely physical (ie consciousness independent) objects in whatever this is - dreaming or waking.

He focuses on some of the main arguments for physicalism that have been made by the scientists he is familiar with:

The predictive power of science providing logical evidence for physicalist views

the consistency of scientific results among different scientists (the dream in the thought experiment will last months, so Josh has time to do as much collaborative research as he wishes)

******

So the question is:

What scientific experiment or set of experiments would you perform, if you were in Josh's situation, to determine whether or not you were in a dreaming state universe or waking state universe?

HINT: I know of only one experiment that would definitely determine whether or not Josh is dreaming, but let's see if you can come up with one - or more.

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