1. I simply don't think its true - there have been many talks where I have become interested 10 minutes in.
2. It puts tremendous pressure on the speaker for some kind of fireworks in their first 10 seconds.
Your 10 seconds went badly? Who cares just make sure the next 10 seconds are interesting, or the next.
As far as its actual effectiveness, it doesn't seem meaningful to involk anecdotal data (i.e. "I've seen counter examples") as the parent post isn't stating that you must, but rather it's a generally good idea or a hack.
Given the data around interviewers making pass/reject decisions within the first few minutes of an interview, I would find it surprising if it wasn't true.
This is ludicrous, given that an interview and a tech talk are completely different things. In particular, an interviewer doesn't generally expect or hope to learn anything useful during an interview. That difference alone makes the situations not comparable.
it doesn't seem meaningful to involk anecdotal data
That anecdote is the only bit of data at hand. The comparison to interviews is mere wild speculation.
Really? then why are they always asking questions? :p
The effect is supposedly about lighting up the reptilian brain, and you can drop further limbic system boosts throughout your talk to raise arousal level (heart rate, adrenaline) of your audience, which supposedly keeps their interest high. I learnt this on a demo course, perhaps it's just obvious didactic technique.
I should add it's obviously high stakes but can really make your talk stand out, especially if your talk is within a series of conventionally structured talks.
Last time I went to a conference I was actually a little surprised by the number of people at the talks who where clearly working during the entire thing. Why bother, you most likely pay for the plane ticket, the hotel and the conference it self, and then not pay attention? If you're only interested in one talk, then just go to that one and then leave.
Given that people mostly show up to technical talks of their own free will, I don't think you need to trick them into paying attention. It's fair to assume that they are generally interested and focused on what you have to say.
On another level, sometimes I go to meetups in my area which are technically the same conference presentation as well. There are times when I regret going to the meetup (There's 10-20 people) because of how boring the speaker is or how overly technical it becomes, but I don't want to be rude and leave the area cause it'd reflect poorly. Its not like a convention where leaving is okay, everyone in the area knows each other.
(Fun fact, the first conference I went to had like five coffee breaks per day, and I got a coffee at every break and complained to someone at dinner that there was too much coffee and not enough talking. They explained it to me quickly enough!)
For topics I'm familiar with, however, I find most talks too simple so I might as well get work done while vaguely listening. Ideally the talk would get more complex, but it usually doesn't.
Nearly all of the interesting things at conferences happen between the talk sessions. Usually, at a bar. Usually, at about 11 o’clock at night. The reason is a lot of people go to conferences has everything to do with networking, and politics. Sometimes, they actually go to talks too.
If I feel like the speaker is just lazy then I'll get up and go somewhere else.
Note that this only works above a certain size: if it's happening in a conference room I will at least pretend to take notes on paper instead of reading email / HN / bugs / etc.
I'm not really sure whether this makes me more considerate, or more duplicitous, or maybe both.