So if I can't avoid it, the next best thing would be to influence skillfully, not clumsily. In both cases, the other person's behavior is being influenced, and in both cases they are not explicitly aware of this. The only difference in the second case is that I know what I'm doing.
I think there is a difference. You're right that all our behavior has or can have a reinforcing effect on other people. But smiles, and frowns, and thank-yous and such aren't therefore just reinforcers. When I smile at someone, I express something like affection, and if I don't feel any affection, I smile falsely. All these kinds of behaviors are the sorts of things that can be done honestly or falsely, and we ought to do them honestly. We do this with children, but with adults it's disrespectful.
It might be possible to smile at someone for the sake of reinforcing some behavior of theirs, and to feel affection all the while, but my sense is that either a smile is an expression of affection, or it is done for some ulterior end.
I think your initial reaction to PUA is spot on. It's a monstrous practice.
my sense is that either a smile is an expression of affection, or it is done for some ulterior end.
Here's where I think human thinking is more complicated, muddled, and mutually-reinforcing than you say. In the example of saying "Thank you," is it really so inconceivable that someone might say "Thank you," while thinking (or, more likely, wordlessly intuiting) something along the lines of "I'm grateful and happy that this person did this, and I would like them to do it again"? In fact, much of these "reinforcement"...
Part of the sequence: The Science of Winning at Life
Also see: Basics of Animal Reinforcement, Basics of Human Reinforcement, Physical and Mental Behavior, Wanting vs. Liking Revisited, Approving reinforces low-effort behaviors, Applying Behavioral Psychology on Myself.
Story 1:
On Skype with Eliezer, I said: "Eliezer, you've been unusually pleasant these past three weeks. I'm really happy to see that, and moreover, it increases my probability than an Eliezer-led FAI research team will work. What caused this change, do you think?"
Eliezer replied: "Well, three weeks ago I was working with Anna and Alicorn, and every time I said something nice they fed me an M&M."
Story 2:
I once witnessed a worker who hated keeping a work log because it was only used "against" him. His supervisor would call to say "Why did you spend so much time on that?" or "Why isn't this done yet?" but never "I saw you handled X, great job!" Not surprisingly, he often "forgot" to fill out his worklog.
Ever since I got everyone at the Singularity Institute to keep work logs, I've tried to avoid connections between "concerned" feedback and staff work logs, and instead take time to comment positively on things I see in those work logs.
Story 3:
Chatting with Eliezer, I said, "Eliezer, I get the sense that I've inadvertently caused you to be slightly averse to talking to me. Maybe because we disagree on so many things, or something?"
Eliezer's reply was: "No, it's much simpler. Our conversations usually run longer than our previously set deadline, so whenever I finish talking with you I feel drained and slightly cranky."
Now I finish our conversations on time.
Story 4:
A major Singularity Institute donor recently said to me: "By the way, I decided that every time I donate to the Singularity Institute, I'll set aside an additional 5% for myself to do fun things with, as a motivation to donate."
The power of reinforcement
It's amazing to me how consistently we fail to take advantage of the power of reinforcement.
Maybe it's because behaviorist techniques like reinforcement feel like they don't respect human agency enough. But if you aren't treating humans more like animals than most people are, then you're modeling humans poorly.
You are not an agenty homunculus "corrupted" by heuristics and biases. You just are heuristics and biases. And you respond to reinforcement, because most of your motivation systems still work like the motivation systems of other animals.
A quick reminder of what you learned in high school
What works
Example applications
For additional examples and studies, see The Power of Reinforcement (2004), Don't Shoot the Dog (2006), and Learning and Behavior (2008).
I close with Story 5, from Amy Sutherland:
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My thanks to Erica Edelman for doing much of the research for this post.