As with so many bold ideas, I worry that it leaves the impression that one causal factor (signaling, in this case) has overwhelming explanatory power. One of the few things we can say for sure about social sciences is that the effect sizes are almost always small, whether of immutable traits or interventions (<<0.5, probably <0.2). From my armchair, I suspect it's because people are so different, particularly when considering their contexts when making a specific decision.
To get specific, maybe the educated urban 20something makes art because of signaling. But maybe Frida Kalho really had something that she needed to say. Maybe a toddler just likes orange. Maybe that same 20something transitions into doing it for the sake of quiet mastery-driven self-esteem after getting some random praise early on from their now-wife. So the effect (like many others) can be real, but it's a lot more useful to specify the people+contexts where we'd expect it to be most predictive.
Agreed - I was originally thinking of doing a section on 'just how much of this stuff actually is signalling?', but I think it's pretty hard to come up with reasonable estimates and a lot of time the evidence is sort of ambiguous. I completely agree though (as hopefully you know, given past writing) that not much of this stuff is literally only about signalling.
+1 to Matthew's comment. I'd add: many of the counter-arguments that signalling advocates use against perspectives like Matthew's end up inflating the concept to the point of near-meaninglessness.
The most fundamental phenotypical fact about Homo sapiens is that we live in cultures, meaning (a) we act collectively but (b) the 'script' for our collective action is not hardcoded into our psychologies; it's flexible and emergent from our interactions with others. For example, every human culture has complex collective courting/mating rituals, but they each have *different* rituals. Evolution didn't give us a psychological module for using Tinder; it gave us a generalised motivation to seek a mate, but left a lot of things blank (who is an appropriate mate? how do I meet them? how do we coordinate our actions?) to be filled in through cultural learning. This cultural learning is learning *from* and *about* other people, looking at their actions and gleaning some credible information about their characters and motivations. In other words, almost all of our behaviour must *necessarily* have a signalling aspect, because humans must transmit information to each other about their behavioural dispositions in order to live under culture.
But when interpreted like this, the claim 'a lot of human action is signalling' is nearly tautological, essentially equivalent to 'human beings live under culture'. The claim that art is signalling, for example, comes down to the claim that artists create art in large part to transmit private information about themselves to other people - which is just obvious! The claim that love and dating is just signalling is even more blatantly trivial if poked at a little, since we don't have a cognitive module for Tinder. The claim that morality is just signalling is at least as old as Adam Smith, if not Aristotle: human beings would never learn to make moral judgments if they were alone outside of society, so the phenomenon of moral judgment is emergent from learning information about other humans. If 'signalling' is interpreted broadly, as meaning just 'conveying information about oneself through one's behaviour', then none of this is particularly interesting or insightful.
Now, I think this inflated concept of 'signalling' still has a lot of use in e.g. mathematical models of human behaviour: an account of signalling can help us incorporate culture into our rational choice models, which is incredibly helpful. But economists and rational choice theorists tend to get this backwards: rather than 'signalling' being a concept used to revise our rational-choice models so they match up more closely with common-sense accounts of human behaviour, they see it as a concept from rational-choice models that we should use to revise our common sense!
Now, as we've already seen, in fact there's nothing contrary to common sense in the claim that human behaviour is largely signalling. So in order to vindicate a revisionist account, people like Hanson and Simler must be using the word 'signalling' in a more narrow way, limiting their focus to instances where our behaviour conveys *certain types* of information. Typically, people like this have a conception that we might call signalling-as-bragging: the information that our behaviour conveys is roughly 'Oh, look at me, aren't I great?'. To take a specific example, rather than the artist signalling information about their emotions or their moral convictions or etc., they are signalling 'I am talented and have good taste'.
The claim that most of human behaviour is braggadocious *is* contrary to common-sense; but it's also not obviously true. Interpreted in this narrow way, the hypothesis that 'much human behaviour is signalling' is subject to the kind of arguments Matthew makes: it's probably underpowered, and while bragging might be a big part of human psychology there just isn't enough evidence to make a stronger claim than that. In response to these claims, the advocates of 'signalling hypotheses' often then retreat to the motte, interpreting signalling broadly.
One can see this move in the example of baboons. Sam introduces this example as a case from the animal kingdom that might illustrate, via analogy, how 'we often have selfish or otherwise unattractive motivations'. But, while baboon grooming is signalling behaviour, it's not unattractive signalling: the baboons are signalling their willingness to aid each other! 'I am doing this to show how much I am willing to do for you, in the hope that the feeling is reciprocated' is not an unattractive motivation, never mind a selfish one, for animals (including humans) to have - it's the kind of motivation that we *hope* our romantic partners have, for example, in remembering anniversaries or purchasing flowers.
If we approach human behaviour with a lens that is overwhelmingly dominated by considerations of economic rationality, then signalling might initially look like a small and unimportant quirk; it could then be a surprise to learn how prevalent it is. But, if we are interpreting 'signalling' broadly and using any other lens to analyse human behaviour, its prevalence isn't shocking at all - it's basic and even obvious. Another way to put this is that signalling is not, in fact, just one causal factor (as Matthew put it); it's a whole range of causal factors, corresponding to essentially every culturally-influenced part of our psychology. The issue is that in economic contexts, signalling is often introduced with examples of bragging or showing off (conspicuous consumption, for example, or metaphorical peacock tails), and so the prevalence of signalling-interpreted-broadly is conflated with the prevalence of signalling-as-bragging, a single causal factor that is attributed huge significance. These two different ways of interpreting a 'signalling hypothesis' are not often disambiguated, creating slippage between a true-but-boring claim and an interesting-but-false claim.
Quick response without having given your comment as much thought as I likely should - I think the problem here is that you're making the claims sound tautological and trivial by stripping them of the empirical evidence that makes them interesting and helpful in making predictions.
'Art is used to convey information about people' sounds obvious, but 'art is largely a fitness display intended to say something about the artist, and this can help us make predictions about how people will judge art' is more interesting, and then when you add (at least mildly) counterintuitive studies about how people will rate the same piece of art differently depending on how many artists were involved in its creation is more interesting still.
Similarly, giving money to charity (or acting morally more generally) being at least partially about communicating [insert virtue here] sounds obvious, but the specific results (only 1% of donations being anonymous, donations going up significantly when the woman asking is more attractive) are interesting.
I also think I should've been more explicit about the baboon example, the relevant fact here is that higher-ranked individuals receive significantly more grooming than do lower-ranked individuals, and it's suggested that the reason that lower ranking individuals are grooming higher-ranking baboons without expecting grooming in return is that they're angling for future protection/benefits from the higher-ranking baboon in future conflict.
So, yes - 'lots of the things we do are intended to convey information about ourselves' is a boring claim, but the ways in which we convey information about ourselves and the extent to which our activities are signalling (I would've guessed more than 1% donations being anon, maybe you would not have) are interesting. That being said, you have claimed here that lots of the evidence is pretty underwhelming (although perhaps that is for the bragging claim specifically?), so I'd be interested in hearing you elaborate there.
I do, however, think that the framework of 'signalling' has generally been unhelpful and misleading. In general, the interesting bit of signalling hypotheses is less 'this action is a signal' and more 'this action is a signal FOR THIS THING': the interesting claim is not that art is a signal, but more that it's a signal for (something like) fitness. This is because essentially all human actions are signals! And so, claims about signalling can generally be losslessly restated without using the language of signalling - as you do when you restate the claim about art in terms of predictions about people's aesthetic judgments.
Maybe the existence of the concept of signalling has made it easier for people to come up with interesting psychological hypotheses. (It seems this way in the belief-formation case which I mentioned above - Williams' paper states its central claim without reference to signalling, but it's quite clear he only came up with this claim through thinking about signalling.) But I think it also has a downside: the use of such a broad, general concept allows people to play motte-and-bailey in a lot of cases, because they think the important part of their thesis is the boring 'this action is a signal' bit and not the controversial, falsifiable 'this action is a signal FOR THIS THING' bit.
One of the phenomena cited here (changes in altruism when witnessed) has been demonstrated to have no effect on Autistic people. As an Autistic person who studied Lorentz and the rest back in ye olde 20thC I often felt confused by suggestions extrapolated from grooming behaviour in chimps to universal statements about human motivations, when I struggled to feel the "debts" in economies of cooperation.
So I wonder if this isn't a good time to ask the author to specify "in Allistic people"? I mean, the suggestion in this essay is that signalling is universal among neurotypes. But evidence suggests otherwise.
As with so many bold ideas, I worry that it leaves the impression that one causal factor (signaling, in this case) has overwhelming explanatory power. One of the few things we can say for sure about social sciences is that the effect sizes are almost always small, whether of immutable traits or interventions (<<0.5, probably <0.2). From my armchair, I suspect it's because people are so different, particularly when considering their contexts when making a specific decision.
To get specific, maybe the educated urban 20something makes art because of signaling. But maybe Frida Kalho really had something that she needed to say. Maybe a toddler just likes orange. Maybe that same 20something transitions into doing it for the sake of quiet mastery-driven self-esteem after getting some random praise early on from their now-wife. So the effect (like many others) can be real, but it's a lot more useful to specify the people+contexts where we'd expect it to be most predictive.
Agreed - I was originally thinking of doing a section on 'just how much of this stuff actually is signalling?', but I think it's pretty hard to come up with reasonable estimates and a lot of time the evidence is sort of ambiguous. I completely agree though (as hopefully you know, given past writing) that not much of this stuff is literally only about signalling.
+1 to Matthew's comment. I'd add: many of the counter-arguments that signalling advocates use against perspectives like Matthew's end up inflating the concept to the point of near-meaninglessness.
The most fundamental phenotypical fact about Homo sapiens is that we live in cultures, meaning (a) we act collectively but (b) the 'script' for our collective action is not hardcoded into our psychologies; it's flexible and emergent from our interactions with others. For example, every human culture has complex collective courting/mating rituals, but they each have *different* rituals. Evolution didn't give us a psychological module for using Tinder; it gave us a generalised motivation to seek a mate, but left a lot of things blank (who is an appropriate mate? how do I meet them? how do we coordinate our actions?) to be filled in through cultural learning. This cultural learning is learning *from* and *about* other people, looking at their actions and gleaning some credible information about their characters and motivations. In other words, almost all of our behaviour must *necessarily* have a signalling aspect, because humans must transmit information to each other about their behavioural dispositions in order to live under culture.
But when interpreted like this, the claim 'a lot of human action is signalling' is nearly tautological, essentially equivalent to 'human beings live under culture'. The claim that art is signalling, for example, comes down to the claim that artists create art in large part to transmit private information about themselves to other people - which is just obvious! The claim that love and dating is just signalling is even more blatantly trivial if poked at a little, since we don't have a cognitive module for Tinder. The claim that morality is just signalling is at least as old as Adam Smith, if not Aristotle: human beings would never learn to make moral judgments if they were alone outside of society, so the phenomenon of moral judgment is emergent from learning information about other humans. If 'signalling' is interpreted broadly, as meaning just 'conveying information about oneself through one's behaviour', then none of this is particularly interesting or insightful.
Now, I think this inflated concept of 'signalling' still has a lot of use in e.g. mathematical models of human behaviour: an account of signalling can help us incorporate culture into our rational choice models, which is incredibly helpful. But economists and rational choice theorists tend to get this backwards: rather than 'signalling' being a concept used to revise our rational-choice models so they match up more closely with common-sense accounts of human behaviour, they see it as a concept from rational-choice models that we should use to revise our common sense!
Now, as we've already seen, in fact there's nothing contrary to common sense in the claim that human behaviour is largely signalling. So in order to vindicate a revisionist account, people like Hanson and Simler must be using the word 'signalling' in a more narrow way, limiting their focus to instances where our behaviour conveys *certain types* of information. Typically, people like this have a conception that we might call signalling-as-bragging: the information that our behaviour conveys is roughly 'Oh, look at me, aren't I great?'. To take a specific example, rather than the artist signalling information about their emotions or their moral convictions or etc., they are signalling 'I am talented and have good taste'.
The claim that most of human behaviour is braggadocious *is* contrary to common-sense; but it's also not obviously true. Interpreted in this narrow way, the hypothesis that 'much human behaviour is signalling' is subject to the kind of arguments Matthew makes: it's probably underpowered, and while bragging might be a big part of human psychology there just isn't enough evidence to make a stronger claim than that. In response to these claims, the advocates of 'signalling hypotheses' often then retreat to the motte, interpreting signalling broadly.
One can see this move in the example of baboons. Sam introduces this example as a case from the animal kingdom that might illustrate, via analogy, how 'we often have selfish or otherwise unattractive motivations'. But, while baboon grooming is signalling behaviour, it's not unattractive signalling: the baboons are signalling their willingness to aid each other! 'I am doing this to show how much I am willing to do for you, in the hope that the feeling is reciprocated' is not an unattractive motivation, never mind a selfish one, for animals (including humans) to have - it's the kind of motivation that we *hope* our romantic partners have, for example, in remembering anniversaries or purchasing flowers.
If we approach human behaviour with a lens that is overwhelmingly dominated by considerations of economic rationality, then signalling might initially look like a small and unimportant quirk; it could then be a surprise to learn how prevalent it is. But, if we are interpreting 'signalling' broadly and using any other lens to analyse human behaviour, its prevalence isn't shocking at all - it's basic and even obvious. Another way to put this is that signalling is not, in fact, just one causal factor (as Matthew put it); it's a whole range of causal factors, corresponding to essentially every culturally-influenced part of our psychology. The issue is that in economic contexts, signalling is often introduced with examples of bragging or showing off (conspicuous consumption, for example, or metaphorical peacock tails), and so the prevalence of signalling-interpreted-broadly is conflated with the prevalence of signalling-as-bragging, a single causal factor that is attributed huge significance. These two different ways of interpreting a 'signalling hypothesis' are not often disambiguated, creating slippage between a true-but-boring claim and an interesting-but-false claim.
Quick response without having given your comment as much thought as I likely should - I think the problem here is that you're making the claims sound tautological and trivial by stripping them of the empirical evidence that makes them interesting and helpful in making predictions.
'Art is used to convey information about people' sounds obvious, but 'art is largely a fitness display intended to say something about the artist, and this can help us make predictions about how people will judge art' is more interesting, and then when you add (at least mildly) counterintuitive studies about how people will rate the same piece of art differently depending on how many artists were involved in its creation is more interesting still.
Similarly, giving money to charity (or acting morally more generally) being at least partially about communicating [insert virtue here] sounds obvious, but the specific results (only 1% of donations being anonymous, donations going up significantly when the woman asking is more attractive) are interesting.
I also think I should've been more explicit about the baboon example, the relevant fact here is that higher-ranked individuals receive significantly more grooming than do lower-ranked individuals, and it's suggested that the reason that lower ranking individuals are grooming higher-ranking baboons without expecting grooming in return is that they're angling for future protection/benefits from the higher-ranking baboon in future conflict.
So, yes - 'lots of the things we do are intended to convey information about ourselves' is a boring claim, but the ways in which we convey information about ourselves and the extent to which our activities are signalling (I would've guessed more than 1% donations being anon, maybe you would not have) are interesting. That being said, you have claimed here that lots of the evidence is pretty underwhelming (although perhaps that is for the bragging claim specifically?), so I'd be interested in hearing you elaborate there.
This is a fair point. To be clear, I actually do think there's some really interesting specific claims being made about signalling that are absolutely not trivial - I really love the stuff that Funkhouser (https://www.tandfonline.com/doi/full/10.1080/09515089.2017.1291929) and Williams (https://onlinelibrary.wiley.com/doi/abs/10.1111/mila.12294) have done on the signalling component of belief-formation. So I perhaps was making my case in overly broad brushstrokes.
I do, however, think that the framework of 'signalling' has generally been unhelpful and misleading. In general, the interesting bit of signalling hypotheses is less 'this action is a signal' and more 'this action is a signal FOR THIS THING': the interesting claim is not that art is a signal, but more that it's a signal for (something like) fitness. This is because essentially all human actions are signals! And so, claims about signalling can generally be losslessly restated without using the language of signalling - as you do when you restate the claim about art in terms of predictions about people's aesthetic judgments.
Maybe the existence of the concept of signalling has made it easier for people to come up with interesting psychological hypotheses. (It seems this way in the belief-formation case which I mentioned above - Williams' paper states its central claim without reference to signalling, but it's quite clear he only came up with this claim through thinking about signalling.) But I think it also has a downside: the use of such a broad, general concept allows people to play motte-and-bailey in a lot of cases, because they think the important part of their thesis is the boring 'this action is a signal' bit and not the controversial, falsifiable 'this action is a signal FOR THIS THING' bit.
Sorry I'm a bit late to this ... But Daniel nettle has a good post about the watching eyes effect
https://www.danielnettle.org.uk/2022/03/28/breaking-cover-on-the-watching-eyes-effect/
What an interesting essay!
One of the phenomena cited here (changes in altruism when witnessed) has been demonstrated to have no effect on Autistic people. As an Autistic person who studied Lorentz and the rest back in ye olde 20thC I often felt confused by suggestions extrapolated from grooming behaviour in chimps to universal statements about human motivations, when I struggled to feel the "debts" in economies of cooperation.
So I wonder if this isn't a good time to ask the author to specify "in Allistic people"? I mean, the suggestion in this essay is that signalling is universal among neurotypes. But evidence suggests otherwise.