modern neuroscience: room for the soul? -...
TRANSCRIPT
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Modern neuroscience: Room for the soul?
John Beggs
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Outline
• Introduction• Neuroscience background• Free Will• Ethics• God • Implications
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Outline
• Introduction• Neuroscience background • Free Will• Ethics• God • Implications
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Apollo’s chariot…
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…or rotation of the earth?
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Science killed Apollo.
Will neuroscience kill the soul?
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Dualism
Rene DescartesBody Mind
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Dualism
Rene Descartes
Body and mind are separate
The mind influences the body
Mind is the fundamental truth
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The modern view: monism
Francis Crick
The brain produces the mind
Body, or matter, is the fundamental truth
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What is the Biblical view?• “Today you will be with me in paradise.” -Luke
23:43
• “Do not be afraid of those who kill the body but are not able to kill the soul; rather be afraid of the One who is able to destroy soul as well as body in hell.” –Matt 10:28
• “I desire to depart and be with Christ, which is better by far.” -Phil 1:23
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What is the Biblical view?• “Today you will be with me in paradise.” -Luke
23:43
• “Do not be afraid of those who kill the body but are not able to kill the soul; rather be afraid of the One who is able to destroy soul as well as body in hell.” –Matt 10:28
• “I desire to depart and be with Christ, which is better by far.” -Phil 1:23
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What is the Biblical view?• “Today you will be with me in paradise.” -Luke
23:43
• “Do not be afraid of those who kill the body but are not able to kill the soul; rather be afraid of the One who is able to destroy soul as well as body in hell.” –Matt 10:28
• “I desire to depart and be with Christ, which is better by far.” -Phil 1:23
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What is the Biblical view?• “Today you will be with me in paradise.” -Luke
23:43
• “Do not be afraid of those who kill the body but are not able to kill the soul; rather be afraid of the One who is able to destroy soul as well as body in hell.” –Matt 10:28
• “I desire to depart and be with Christ, which is better by far.” -Phil 1:23
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The opposing view
• “All that you touch and all that you see is all your life will ever be.” –Pink Floyd
• “Out, out, brief candle! Life's but a walking shadow, a poor player that struts and frets his hour upon the stage and then is heard no more: it is a tale told by an idiot, full of sound and fury, signifying nothing." Macbeth (Act V, Scene V).
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Outline
• Introduction• Neuroscience background• Free Will• Ethics• God • Implications
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Trying to explain different levels
macroscopic
mesoscopic
microscopic
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Cortical neurons from rat
~1010 neurons in human brain
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Neurons generate voltage pulses
time
volta
ge
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Output is communicated by pulses through synapses
time
volta
ge
Memory?
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Each neuron makes and receives many connections
~ 103 – 104 outputs
~ 103 – 104 inputs
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If all the inputs exceed a threshold, the neuron will “fire”
out
in
in
in
in
Otherwise, it won’t
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From the lab of David McCormick, Yale University
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The cortical sheet is responsible for higher functions
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Beggs lab: small sections of the sheet
In collaboration with Alan Litke, UC Santa Cruz
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Cortical structure is fairly uniformFunctions are partially localized in cortex
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Outline
• Introduction • Neuroscience background • Free Will• Ethics• God • Implications
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Every physical system that has been investigated has turned out to be either deterministic or random. “Both are bad news for free will,” he said. So if human actions can’t be caused and aren’t random, he said, “It must be — what — some weird magical power?”
- Michael Silberstein
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Benamin Libet’s experiment
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Readiness potential precedes will to move
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There is no free will
I was predestined to win this argument!
John Calvin
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Response to Libet’s experiments
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Response to Libet’s experiments
Will
Hand movement
Conscious reflectionon decision
Readinesspotential
“I have decided”
Are there any examples of our awareness “lagging behind”?
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Blindsight
(Lawrence Weiskrantz)
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So…
My tendencies could be detected by electrodes, or by questionsthat you ask me.
But I do not necessarily act on all my tendencies.
Example: I may be angry at someone, but I may chose to forgive them.
Which takes more “willpower”: anger or forgiveness?
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Free Will
• Free will may be a new type of process, as yet not fully understood.
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Free Will
• Free will may be a new type of process, as yet not fully understood.
• Signals of my intentions may come before my sensed decision. But my choice may actually come before both.
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Free Will
• Free will may be a new type of process, as yet not fully understood.
• Signals of my intentions may come before my sensed decision. But my choice may actually come before both.
• We have many strong automatic tendencies, but these are often overruled by our will.
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Outline
• Introduction• Neuroscience background • Free Will• Ethics• God • Implications
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Jonathan Cohen
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A runaway trolley is hurtling down the tracks toward five people who will be killed if it proceeds on its present course. The only way to save them is to hit a switch that will turn the trolley onto an alternate set of tracks where it will kill one person instead of five.
Most people hit the switch, saving five
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As before, a trolley threatens to kill five people. You are standing next to a large stranger on a footbridge that spans the tracks in between the oncoming trolley and the five people. In this scenario, the only way to save the five people is to push this stranger off the bridge, onto the tracks below. He will die if you do this, but his body will stop the trolley from reaching the others.
Most people refrain from pushing, letting five die
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What makes it morally acceptable to sacrifice one life to save five in the trolley dilemma but not in the footbridge dilemma?
“Emotional” areas(footbridge dilemma)
“Cognitive” areas(trolley dilemma)
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Should one smother a crying baby to death to protect the lives of many when enemy soldiers are approaching? Here they compared the activation patterns in the brains between those who approve (utilitarians) and those who do not (deontologists).
Deontologists: Don’t smother – “emotional” brain areas dominate
Utilitarians: Smother – “cognitive” brain areas dominate
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"The social-emotional responses that we've inherited from our primate ancestors . . . undergird the absolute prohibitions that are central to deontology. In contrast, the 'moral calculus' that defines utilitarianism is made possible by more recently evolved structures in the frontal lobes that support abstract thinking and high-level cognitive control."
- Greene and Cohen
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From this we are to conclude…
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From this we are to conclude…
• Utilitarianism, being most recent, is correct
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From this we are to conclude…
• Utilitarianism, being most recent, is correct• Deontological views, being most ancient,
are incorrect
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From this we are to conclude…
• Utilitarianism, being most recent, is correct• Deontological views, being most ancient,
are incorrect
• But would you rather have a utilitarian as a neighbor? As a parent?
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From this we are to conclude…
• Utilitarianism, being most recent, is correct• Deontological views, being most ancient,
are incorrect
• But would you rather have a utilitarian as a neighbor? As a parent?
• Don’t let neuroscientists tell us how to live!
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Outline
• Introduction • Neuroscience background • Free Will• Ethics• God • Implications
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Michael Persinger
80% of Dr Michael Persinger's experimental subjects report that an artificial magnetic field focused on …[left temporal lobe] brain areas gives them a feeling of 'not being alone'. Some of them describe it as a religious sensation.
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Out-of-body experience?
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Even Richard Dawkins…
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Reply to Persinger
I can also create the illusion of spirals by giving people LSD. Does this mean that all spirals are just figments of the mind? No real spirals exist?
Just because you can stimulate me to think about God does not mean he is only in my head!
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Outline
• Introduction • Neuroscience background • Free Will• Ethics• God • Implications
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If there is a soul
• “…there has been a connection both historically and theologically between the existence of a substantial soul and the supernatural realm. If the soul exists, then this is very good reason to think that a personal, self-aware being – God –exists.” -J.P.Moreland
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If there is no soul
• “These [embryos] are microscopic groupings of a few differentiated cells. There is nothing human about them except potential – and, if you chose to believe it, a soul.” –Michael Kinsley, Time magazine, June 25, 2001 (from J.P. Moreland)
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But does philosophy have any impact on real-world events?
John Locke – American revolutionKarl Marx – Russian revolution
Mind/Body debate – Euthanasia, abortion, value of human life, how we treat each other, empathy, war, whether people accept God or not…
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“God is spirit, and his worshippers must worship him in spirit and in truth.” – John 4:24
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“You don't have a soul. You are a Soul. You have a body.”-C.S. Lewis
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Conclusions
• Mental functions may be produced by the brain
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Conclusions
• Mental functions may be produced by the brain
• This includes mechanisms of will, moral choice, and perceptions of God
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Conclusions
• Mental functions may be produced by the brain
• This includes mechanisms of will, moral choice, and perceptions of God
• From this it does not follow that:
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Conclusions
• Mental functions may be produced by the brain
• This includes mechanisms of will, moral choice, and perceptions of God
• From this it does not follow that: • Free will is an illusion
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Conclusions
• Mental functions may be produced by the brain
• This includes mechanisms of will, moral choice, and perceptions of God
• From this it does not follow that: • Free will is an illusion• Utilitarianism is correct
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Conclusions
• Mental functions may be produced by the brain
• This includes mechanisms of will, moral choice, and perceptions of God
• From this it does not follow that: • Free will is an illusion• Utilitarianism is correct• God is an illusion
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Conclusions
• Accept the science, but not the nonscientific conclusions
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Modern neuroscience: Room for the soul?
By John Beggs
Thanks!
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Other interesting topics• “Mind reading” fMRI scans• Remote control of rats• Neural control of prosthetic limbs• Mentally moving a cursor for shut in patients• Closed loop experiments: “Brain in a dish”• Split brain experiments• Hemineglect• Prosopagnosia• The case of H.M.; no new memories• “Gay” rams?• Spiritual machines?