523. Why We Dream, Learn, and Adapt Faster Than Any Other Species | Dr. David Eagleman
Episode Stats
Length
1 hour and 35 minutes
Words per Minute
183.79166
Summary
David Eagleman, an adjunct professor of psychiatry at Stanford University and founder of two companies, Neosensory and BrainCheck, joins me in this episode to talk about the importance of brain plasticity and why we are the only species that is as plastic as we are.
Transcript
00:00:00.000
The conscious brain is a broom closet in the mansion of the brain
00:00:06.740
There may be free will, but it's going to be a small player if it's there.
00:00:10.240
Every drive wants to philosophize in its spirit.
00:00:21.440
why people cling so desperately to their frameworks.
00:00:24.600
This doesn't answer the free will question, though.
00:00:28.480
because it doesn't work the way people think it does.
00:00:30.960
You know, when it comes to this question of truth,
00:00:34.440
because you've got a completely different set of experiences
00:00:44.620
that I don't think I've thought about exactly before.
00:01:04.560
I had the opportunity to speak to David Eagleman today.
00:01:08.040
David is an adjunct professor of psychiatry at Stanford University.
00:01:18.940
David recently did a course for Peterson Academy
00:01:33.360
thoroughly adopted in the neuroscience literature,
00:01:35.320
and it means something like adaptive flexibility.
00:02:13.160
which is a very interesting philosophical issue
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It's about how brains absorb the world around them
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essentially came up with a different trick with us
00:50:21.780
the aim has to be shared test the aim has to be
01:13:31.460
moving within a neighborhood that's right so and
01:13:33.980
that's that see carl friston the neuroscientist he's
01:13:37.620
he's derived a pretty decent model of anxiety as an index of
01:13:41.520
entropy and so right right cool right right and so
01:13:45.080
that would be anxiety as entropy and entropy as
01:13:53.460
let me make sure i can unpack that it's that if you're
01:13:55.320
looking at a high entropy state where there's lots of
01:13:59.720
anxiety actually indexes that that's what it's for
01:14:03.240
well then and but then the the higher the degree of
01:14:07.400
possibility the less reliable the automated systems
01:14:12.340
that's almost by definition and by the way this goes back to
01:14:14.900
what we were saying also about you know for example the
01:14:17.080
tetris players or let's just say i don't know let's say
01:14:19.200
when you did you play soccer as a kid you play okay so
01:14:21.960
when you first were learning how to play soccer again your
01:14:25.200
brain if we could have measured it while you were running
01:14:26.980
around on the field it's on fire because you're you're
01:14:29.340
trying to figure out wait where's the ball where's
01:14:30.900
everyone else you know it's all knees and elbows and
01:14:33.080
you don't know what's going on okay a professional
01:14:35.160
soccer player is a hundred times better than you but
01:14:38.040
his brain isn't burning nearly as much energy as the
01:14:41.660
child trying to figure this out and so that's right he's
01:14:46.280
in a much lower entropy state exactly he's in a lower entropy
01:14:50.000
state and so it's because his movements are more
01:14:52.880
efficient and right but the reason the reason is
01:14:56.840
because the child is trying to simulate all the
01:14:59.440
possibilities the professional has sort of seen
01:15:04.680
he's got the patterns but the child has the high entropy state
01:15:07.040
because you know what if i try this what if i try that
01:15:09.600
yeah and so on yeah and it's very localized too because when
01:15:12.760
the child is starting to play soccer his field of attention is
01:15:16.960
going to be like this big right he's going to be thinking
01:15:18.920
how many different ways could i move my foot and that makes
01:15:23.100
him a pretty spectacularly horrible soccer player because
01:15:25.900
he's not paying attention to anything that's going on right in
01:15:28.580
gretzky for example the hockey player one of the things he was
01:15:31.440
renowned for and you can imagine this has a consequence of level
01:15:34.940
layered expertise was that he had he was paying attention to what was
01:15:39.280
happening everywhere on the ice well why well because he didn't have to pay
01:15:43.220
attention to skating he didn't have to pay attention to how he was holding his
01:15:46.320
stick he didn't even have to pay attention to where the puck was on his
01:15:50.000
stick because that was all automated so he can move up to higher and higher
01:15:53.660
levels exactly and what he famously said is i i'm not thinking about where the puck is
01:15:57.920
i'm thinking about where the puck is going right right right well and you do
01:16:01.420
that when you learn to drive yes like as you get to be a better and
01:16:04.920
better driver you look farther and farther down the road
01:16:07.220
yeah it's also the case too they've studied this with expert piano players
01:16:11.200
who are playing with sheet music they look ahead of where they're
01:16:17.220
in some sense i think probably what they're doing neurologically
01:16:19.980
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pat it it it's an example that sort of reconciles the free will deterministic
01:17:42.120
conundrum so if you do this this is a ballistic movement you wrote about these
01:17:46.860
in that book right so if i do this the lag time for neural transmission from here
01:17:53.180
to here and back is longer than the duration of that movement so then the
01:17:59.120
question is how do i control that movement and the answer is well i've
01:18:02.560
automated this routine that which is why i can stop my hand
01:18:06.280
because i can't stop it voluntarily right so what happens is i have the routine
01:18:10.800
at hand i disinhibit it and it runs runs automated now i have no free will during that
01:18:16.900
ballistic movement yeah and so what seems to happen with free free will so to speak is that
01:18:22.580
as the as the horizon of the future approaches free will disappears we we devolve into automation
01:18:30.440
as the present makes itself oh that's very interesting so here so okay um so a lot of what
01:18:36.180
i've studied in my career has to do with time our perception of time and uh the bottom line of
01:18:42.180
course is that we live slightly in the past why because it takes time for signals to get
01:18:46.780
you know uh processed and integrated right so when signals hit my for example i used to play baseball
01:18:52.380
and you know when you're swinging at a fast pitch um this all happens unconsciously the best you can do
01:19:00.560
as this ball is traveling from the mound to the plate is to adjust your swing up or down as you're
01:19:06.140
already swinging but all this is happening unconsciously my experience has always been
01:19:11.320
when i hit the ball i'm i become aware that i have just hit the ball and i say to myself
01:19:18.420
throw it out the bat and run right right um because it's already flying um the reason being of course
01:19:24.800
because it takes at least half a second before you get conscious awareness of anything the signals
01:19:28.900
have to move around in your brain as you know signals are very slowly in the brain about a
01:19:33.980
meter per second on unmyelinated axons maybe you know 10 times faster than on myelinated axons
01:19:38.860
and it's 10 times faster yeah yeah okay and that's okay and what's interesting you know we've got big
01:19:44.640
bodies right so you know if i touch your toe the signals have to travel all the way up you know up
01:19:49.200
your leg and up your spinal cord to your brain um but here's the weird part you know if i touch your
01:19:53.840
toe and your nose at the same time you'll feel those simultaneous right right and that's weird
01:19:58.760
because how does your you know does your brain feel the signal from the nose and then say okay
01:20:03.420
i'm just gonna wait and see if that's coming up if your eyes are closed yeah yeah that's weird
01:20:08.420
yeah so here's the thing yeah yeah that's weird this by the way led me to a hypothesis years ago that
01:20:12.900
taller people live further in the past than shorter people because your brain has to wait for all the
01:20:20.160
signals come together your vision your hearing your touch touch from your toes all this stuff to come
01:20:24.380
together it puts together your conscious perception of what's happening right now
01:20:27.880
and that's slightly longer leg time slightly longer leg time if you're taller yeah it's a very funny
01:20:32.760
hypothesis by the way so um yeah so we live a little bit in the past and during that time i totally
01:20:40.860
concur we think there can't be free will involved in any of the processing or or you know certainly
01:20:46.100
reflexes but also ballistic movements that we're doing there's just there's no possibility for free will
01:20:51.120
to operate there if we do have free will the argument i made at the end of incognito is that
01:20:55.800
you know there may be free will it's very difficult neuroscience wise to to nail this question of if
01:21:03.360
there is or not but if there is it's a bit player in a much larger system and so um you know you've got
01:21:09.620
all this unconscious processing most of what's happening the brain i think of the conscious brain is
01:21:14.220
a broom closet in the mansion of the brain um i should say the conscious mind is a broom closet in the
01:21:20.720
mansion of the brain um with very little access to what's going on there may be free will but it's
01:21:26.960
it's going to be a small player well but i mean we could reconcile what we could we could integrate
01:21:33.340
what we discussed earlier with a free will view because you could say and tell me what you think
01:21:37.880
about this i mean obviously our choice isn't unconstrained we're not omniscient there's lots of
01:21:43.360
things we can't do so even if we're free will absolutists we're still playing within a confined
01:21:48.680
domain but you can't you say given what we discuss like throughout this entire conversation that
01:21:55.540
you choose what to automate um i mean like you have like imagine this so you have a novel situation you
01:22:02.380
you envision these variety of different futures and there's some volunteerism in that but then
01:22:08.040
you can direct your attention towards what you determined to practice right this doesn't answer
01:22:14.440
the free will question though because if i choose this particular future we can still question whether
01:22:20.620
i had free will to choose that or if i rewound history a thousand times would i always choose
01:22:24.640
well but i guess the question then would be if that's the case why would it be useful to have the
01:22:30.300
multiplicitous futures make themselves manifest like what if there's no choice between them why have an
01:22:37.240
array one argument for this is that when you simulate a future you then feel emotionally what that
01:22:43.580
future feels like and you compare that to the next future in the next future obviously truth in that
01:22:47.580
yeah and maybe you need to simulate each one in order to make your evaluation but but the question
01:22:54.300
is you know i say oh that future feels the best to me that's who i want to be in long term but was it a
01:22:59.460
free choice i i don't know just for the record i don't come down one way or the other on the free
01:23:03.700
will because i don't i don't know well i think it probably we probably have the question formulated
01:23:08.740
wrong in some fundamental way which is why it can't be resolved but it's also there's also likely
01:23:13.840
such a constant play of indeterminacy and determinacy at every level of decision that
01:23:20.600
you actually can't parse them apart right because i think your argument that we lay out these different
01:23:26.440
simulations and then we evaluate them well that's obviously what you do when you go see a movie is
01:23:31.120
like you're evaluating the decisions that different characters are making and you're feeling that and that
01:23:35.740
is informative and you could think about that as deterministic but then with that argument you have
01:23:40.680
the problem well the reason those simulations feel the way they do was because you chose the aim that
01:23:47.060
you were using to inhabit while you were doing the evaluation and so it just flips you into the problem
01:23:52.000
right away again yeah that's right that's right and you said you were writing a new book yeah we're
01:23:57.640
running out of time oh okay this side so yeah tell us i'd like to where your interests are going and
01:24:02.820
what your new book is about right okay well i'm running a couple of new books and um so one of
01:24:08.320
them is called empire of the invisible and this is about all the stuff that we don't see in other
01:24:15.420
words i've always been fascinated by this question of why do each of us think we know the truth and if
01:24:20.300
we could just shout it on x in all capital letters enough everyone would come to agree with this
01:24:25.720
everyone would see the wisdom of our point of view i've seen firsthand that that isn't true
01:24:29.760
exactly so everybody on social media knows the truth and on any side of the spectrum whether you're
01:24:36.660
you know a denizen of wokistan or magistan or whatever everyone feels like it's clear and my
01:24:42.300
question is why do we all have such limited internal models where we think we know the truth i'm saying
01:24:47.520
this in a in a way that's free of any political opinion i'm speaking metapolitically now um and so
01:24:53.920
this is what empire of the invisible is about is how do we come to our internal models and and why
01:24:59.860
do we take them so seriously when we well this is why fristin's work by the way is so helpful
01:25:05.020
well if you if you understand at least in part that aim constrains entropy then you get some sense
01:25:13.120
almost immediately why people cling so desperately to their frameworks right it isn't just that the
01:25:19.640
framework lays out the pathway or specifies the perceptions yeah it restricts entropy and well
01:25:25.700
then let me just unpack that for the listener it's that when you say okay like this is my view i've got
01:25:30.520
this then the uncertainty is reduced and yeah you've got yeah to almost nothing well and then there's
01:25:36.080
actual physiological consequences of that because what happens if you especially involuntarily enter a
01:25:42.640
high entropy state you start burning up future resources at you you burn up resources that could
01:25:49.780
be conserved in the future in the present and what that actually does is age you right so that's that's
01:25:57.320
an elevate imagine a chronically elevated stress response in response to additional uncertainty
01:26:02.580
that's right and one of the main exactly one of the main goals of the brain always is to reduce
01:26:07.100
energy expenditure of course on the on the immediate time scale yeah of course yep of course so that's
01:26:12.220
the other thing that happens too is that and this is i think the other side of the emotional um uh
01:26:19.040
landscape so a specified and constrained aim reduces entropy that's that's very that's like i think
01:26:26.920
that's the crucial issue but it also sets up the framework within which hope is possible
01:26:31.940
because to the degree that hope is dopaminergically mediated right it's a consequence see friston
01:26:38.360
actually had a unified theory i he told me about this when i interviewed him because i had worked
01:26:43.320
out the anxiety entropy theory with my lab in a separate paper but he said something that i didn't
01:26:49.140
know at all dopaminergic pleasure is also an entropy reduction phenomenon and this is why it's so cool so
01:26:56.400
imagine that you have your aim your goal and now you can compute the energy required to get there
01:27:02.940
okay now that the the farther you away from their goal the more uncertainty there is in in the pursuit
01:27:09.960
now if you take one step toward your goal and you do that successfully you get a mark of positive
01:27:15.760
emotion from that that's a dopaminergic kick but that does indicate an entropy reduction yeah so both
01:27:22.080
positive and negative emotion regulation are associated with entropy reduction oh lovely yeah
01:27:27.140
no kidding well that's a key thing to know when you're thinking why are people so glued to their
01:27:32.160
worldviews it's like well because their positive emotion is dependent on and the regulation of their
01:27:37.380
negative emotion it's like oh okay and it's a positive feedback loop because once you have
01:27:41.960
your point of view on something then of course we know about confirmation bias another way you seek
01:27:46.440
data that that merely validates and you ignore the data that speaks against it well you can
01:27:51.940
see that given what we talked about with regard to perception you can see why that's the case
01:27:56.520
once i specify an aim what i'm going to see are things that move me towards the aim exactly that means the
01:28:03.720
contradictory information not only is irrelevant should be irrelevant like if i'm trying to walk
01:28:09.180
across the room i shouldn't be attending to every potential obstacle that could conceivably exist
01:28:14.380
yeah right i've already simplified things so the obstacles aren't even there right exactly by the way
01:28:20.800
which makes me want to come back to a point that you mentioned about socially seeing people as
01:28:25.340
friends or foes in fact the way we see most people in the world are strangers yeah you don't need to
01:28:31.340
worry yeah exactly you're relevant most things are irrelevant exactly most things are irrelevant yeah
01:28:34.900
yeah and thank god for that yeah exactly so that's analogous here um so um hallucinogens seem to blow
01:28:42.640
that into pieces by the way that's what they do is oh they cause you to pay attention yeah exactly right
01:28:48.260
yeah yeah yeah you pay attention everything becomes relevant so that's the that's the awe-inspiring
01:28:53.460
element of the experience but it's also very very very high entropy yeah right right and you know
01:28:59.000
what i was going to say that this also ties back to another thing about maturation maturation as uh who
01:29:04.820
is it i think it was fitzgerald who said is the ability to hold two contradictory ideas in mind at the
01:29:10.340
same time so so what we're trying to do always is get our our aim to reduce the entropy our worldview
01:29:18.300
but you know as we mature we say okay look it could be this on the other hand it could be that
01:29:22.520
and the ability to hold that and not have that to have a slightly higher entropy and not have that be
01:29:27.440
stressful to us um i don't know that i have kind of a model not a bad that's not a bad definition of a
01:29:33.740
kind of a true confidence right yeah right and well but and it it's also the it is the model of
01:29:40.840
sophisticated thinking because one of the one of the things you do when you think is voluntary enter
01:29:45.480
into a higher entropy state because to really think something through is to allow internal conflict to
01:29:50.980
manifest itself everything the different ideas you have are different manifestations of of different
01:30:00.080
names yeah and so when you think this is what we're trying to train people in university it's like
01:30:05.500
be resilient in the face of voluntarily confronted entropy at least on the cognitive side that's great
01:30:11.440
and maybe instead of think we could call it something like reconsider because it's i mean there's
01:30:16.640
this i only say this because thinking is sort of a term that might have too much semantic weight on it
01:30:21.600
yeah but but reconsider meaning okay i've already considered this i know exactly how to think about it
01:30:26.680
low entropy but now i'm going to reconsider this i'm going to think about what if i what if i'm wrong
01:30:31.980
about this what if it's a totally other model well so there's also evidence this is very cool too
01:30:37.000
there's evidence that if you do that involuntarily the entropy state is higher than if you do it
01:30:43.020
voluntarily and the evidence is very profound it's very profound and so if you take a stance of
01:30:49.140
voluntary confrontation with conflict the stress consequence is much minimized
01:30:55.300
over when it happens voluntarily that's partly why exposure works in in behavior therapy so if you
01:31:02.480
have someone who's traumatized and they're involuntarily exposed to a trigger they get worse
01:31:07.120
but if they voluntarily expose themselves they get better right even though the you know the stimulus
01:31:13.680
so to speak is the same and i think it's it has something to do with a high order meta narrative
01:31:20.920
like the highest order merit meta narrative should be something like i can contend successfully with
01:31:27.580
maybe with entropy it's certainly with chaos that's the sort of creature that i want to be that i should
01:31:33.520
be yeah right right because then when it comes up you don't you don't have a reaction to it yeah exactly
01:31:38.900
yeah oh that's interesting and i imagine this comes up a lot because people are involuntarily
01:31:43.900
confronted with their let's say their political views often there's a whole social component of that
01:31:48.760
which is i'm getting challenged by this person maybe in front of other people that sort of thing
01:31:53.800
and so there's all this other stuff that comes into play yeah but if you get to sit in your the piece
01:31:58.400
of your own home and think you know what if i'm wrong what if the other parties point on this bill
01:32:03.060
what would that look like what would that look like yeah that's a much calmer situation yeah well the
01:32:06.740
the social element of that is is also an entropy issue as far as i can tell because imagine that
01:32:12.620
this took me a long time to parse through so the higher you are in a hierarchy social hierarchy the
01:32:19.320
lower entropy your state your connection networks are better your shelter is better your security is
01:32:25.300
better like that's all part of being higher in a hierarchy okay now the question is what gives you
01:32:31.420
the right to that position and the answer to that is something like the accuracy and your accuracy and
01:32:38.980
view and your competence right if it's a functional hierarchy yeah okay so now i come along and
01:32:43.980
challenge you okay so part of that i'm going to cause internal distress in the manner that we
01:32:49.000
described but i'm also questioning the validity of your grip on the position in that hierarchy so
01:32:54.720
imagine a faculty meeting where you make a presentation or a professor makes a presentation
01:32:59.320
and a first-year graduate student stands up and issues a successful challenge now some of that's
01:33:05.220
ideational and you might say well maybe he's got a better theory but some of it is a challenge to
01:33:11.520
the validity of the fact that you're higher in the hierarchy than he is absolutely right and that you
01:33:16.300
know that's played out yes yeah right so yeah yeah so that's also an entropy issue even the sociological
01:33:23.000
element of yeah yeah yeah i'm always interested in these old uh you know the physicists in the early
01:33:27.780
20th century you know einstein was giving a presentation and i'm afraid i forgot if it was i think it was
01:33:32.880
heisenberg who challenged a young kid challenged him and einstein said you know i think you're right
01:33:38.100
and he went home and worked on the problem for five days and came back but i'm just you know these
01:33:42.860
stories of that kind of challenge and and einstein had you know a very mature reaction right right well
01:33:48.800
that i think a fair bit of the uh what would you say the the the fundamental psychological necessity
01:33:55.940
of something like hero mythology is the inculcation of the attitude that you just described as
01:34:01.900
characteristic of einstein it's like here's a challenge it's like i can handle that yeah i don't
01:34:08.800
have to get defensive it's not going to throw me off maybe there's opportunity that's the dragon
01:34:13.320
and the treasure by the way maybe there's opportunity here in this challenge right that's a
01:34:18.080
very high order match it takes very high order maturation to realize that in every challenge there's
01:34:23.540
opportunity right right right and that's something you can practice it's an attitude that you can
01:34:28.520
practice yes okay we should stop okay we're going to move to the daily wire side what are we going
01:34:35.080
to talk about on the daily wire side i think we should delve more into your book and you have some
01:34:38.460
ideas great well yeah my brain plasticity so we didn't talk about that at all but i've got all kinds
01:34:42.800
of cool stuff to talk about there okay so everybody who's watching if you want to join us on the daily
01:34:46.940
wire side for an additional half an hour please feel free to do that apart from that thank you very
01:34:52.660
much for your time and attention thank you very much for coming here to scottsdale today much
01:34:56.760
appreciated and for teaching our course on the peterson academy which is has got a lovely trailer
01:35:01.820
which i think we're going to incorporate into this podcast actually and um i know that the reaction
01:35:07.420
to your course has been very positive so far and so we're thrilled about that you can catch that
01:35:12.320
on peterson academy by the way thanks for your time and attention everybody