Download - Are you your brain?
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St. Augustine’s Questions
How does the brain/mind encompass:
Vast regions of space and timeAbstract thoughts, numbersThe idea of godLogical propositions and false arguments.
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Brain versus Mind? (Emily Dickinson, 1862)
The Brain - is wider than the Sky -For - put them side by side -The one the other will contain -With ease - and you -beside
The Brain is just the weight of GodFor - heft them - Pound for PoundAnd they will differ - if they doAs Syllable from Sound Emily Dickinson, c 1862
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Three Neuro Decades1990s – decade of the brain2000s – decade of the mind2013 - EU announces €1 billion for a ‘human brain
project’ to build a virtual brain through computer simulation.
Obama announces BRAIN – a $3billion project tracking all the trillions of connections between nerve cells in the human brain (starting with mouse!) paid for by NIH, DARPA etc
Will help ‘epilepsy, depression, schizophrenia, autism, dementia..stroke, cerebral palsy….’ (and the military)
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And the reach of the neurosciences grows ever longerNeurolawNeurowarNeuroeconomicsNeuromarketingNeuroaestheticsNeuroeducationNeuroethics……….And neuroculture??
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The core assumption of modern neuroscience
Minds and consciousness are brain processesTo cure the mind one must cure the brainBut these claims are not uncontested
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Brains and Minds: Four philosophical propositionsDualism: Body/brain …. Soul/mind two
different types of stuffIdentity: Brain/mind are two aspects of the same
phenomenonEpiphenomenalism: Mind emerges from brainMechanical materialism: Minds are ‘nothing but’
brainsNOTE! I am not going to agree with any of these!
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Not all neuroscientists have been hard materialists
Descartes and the pineal gland
Sherrington’s enchanted loom
Sperry’s downward causation
Eccles and the liaison brain – the god of the synapses
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Some modern DualistsEdelman – you are your brain.. plus free will!
Libet - the 350msec gap and the brain’s ‘free won’t’
And some closet dualists – Dawkins, Pinker‘only we can rebel against the tyranny of our selfish
genes‘if my genes don’t like it they can go jump in the lake’
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19th century materialists
Thomas Huxley: Mind is to brain like the whistle to the steam train
Moleschott, Vogt et al: The brain secretes thought like the kidney secretes urine; genius is a matter of phosphorus
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Modern materialistsCrick – ‘you are nothing but a bunch of neurons’Kandel – ‘you are your brain’Silva – ‘ruthless reductionism’Gazzaniga – ‘the ethical brain’LeDoux – ‘synaptic self’Changeaux – ‘neuronal man’
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And some philosophers follow suit
Churchland – neurophilosophy and ‘folk psychology’
Dennett – ‘consciousness explained’
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Some problems for materialists
Subjective experience and qualia – how does conscious experience emerge from brain chemistry/physics
How did consciousness evolve (Darwin v Russell Wallace)
Free will and determinism – ‘my brain made me do it.’
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But if this were trueMinds wouldn’t matter at all – we only need think
brainsBut minds do matter; we have self-awareness;
minds have reasons, are conscious and are evolved properties of humans, with Darwinian survival functions. These are irreducible properties.
So we also have to assume that although there is a qualitative jump between us and our nearest evolutionary relatives (chimps, bonobos) that these and maybe other big brained animals have rudimentary forms of consciousness (Damasio; Nagel)
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fMRI promises to solve the mind/brain question
Brain sites for every thought and feeling‘A happy marriage between fMRI and experimental
psychology can bridge the divide between mind and brain’
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Phrenology – external and internal
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‘Psychopathic Brains?’
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The Right and the Good: Distributive Justice and Neural Encoding of Equity and Efficiency*
Subjects making decisions re allocating meals to children in Ugandan orphanage
Quandary: to share limited food equally (equity) but inadequately, or giving enough food to chosen few (efficiency).
Result: ‘Insula encodes inequity, putamen efficiency’
*Hsu et al Science 320, 1092-5, 2008
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Brain sites for everythingMathematical abilityRomantic loveMoral judgmentsVoting tendencyTerrorist thoughtsPsychopathyAnd of course consciousness
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Neurolove
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So what’s the problem?
Overestimates the power of fMRIBlood flow surrogate measureTimescale (seconds )too longVolume too great :50mm3 contains5m neurons, 50b synapses 22km dendrites,
220km axons!Mistakes activity for location
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Romantic love, psychopathy – and a dead salmon
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But there are more fundamental problems
These studies reify processes, thoughts and judgements – turning concepts from the social realm (efficiency, terrorism, psychopathy..) into localisable ‘things’ in the brain
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So here’s a thought experiment
Let’s invent a cerebroscope
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The cerebroscope
Detects the activity of every neuron in my brain millisecond by millisecond
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The cerebroscope
So it will interpret my brain activity as Steven reading this caption, giving this seminar?
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•Or will it?
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A more dynamic cerebroscope
Not only reads the present state of my synapses but has plotted them millisecond by millisecond from their formation.
So could you now ‘read off’ my mind from my brain?
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I still think the answer is no
The experience may impose a unique pattern in my synapses etc, but can that pattern in turn be read as unique to the experience? The pattern may show I am talking, but will it show the content of my speech?
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BecauseThere’s more to the brain than wiring diagrams and
neurotransmitters Modulators, field effects etc
The brain is in the body hormones, immune system
But more fundamentally:
brain and body are part of the biosocial world in which we are embedded
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Minds are not Brains
Minds are to brains like legs are to walking.We don’t say ‘my legs are walking’ but that we use
our legs to walkSimilarly, it is we who have minds and
consciousness, and we use our brains to think
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Nor are our minds in our bodies
(as St Augustine suggested)Maybe as philosopher Gilbert Ryle suggested we
don’t have minds (noun); instead we mind (verb).
• Minding is a hybrid, not a reified brain process, though it requires the brain, but an ever-changing relationship between an individual and the physical social cultural and historical world;
Consciousness is relational, the dynamic product of present and past brain and body activity, life history and social context, a process, not a reified ‘thing.’