Why Is the Human Brain So Efficient? (2018)
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Re: Why Is the Human Brain So Efficient? (2018)
#2World record tennis serve is 144 miles an hour and a human can't really move across a court and return a ball moving at this speed. If they're lucky they can reach it and react in time to hit it. I'm a bit confused by an article that claims tennis players can react to and return serves up to 160 miles an hour. I think evidence suggests that returning balls anywhere near this fast is dependent on analysing factors before the ball starts moving, the other players body position, racket position etc. Players have an intuition about where the ball is going to go without having to look at and analyse the flight of the ball.
Just did some very basic checking. Tennis court 23m 260mph = 72m/s Ball takes approx. 0.3ms to travel length of court. human reaction time to visual simulous 0.25ms So the idea is they move and hit the ball in the remaining 0.05ms? Hmmmmm.
Re: Why Is the Human Brain So Efficient? (2018)
#3See discussion from 2018: https://news.ycombinator.com/item?id=16895124
Re: Why Is the Human Brain So Efficient? (2018)
#4World record tennis serve is 144 miles an hour and a human can't really move across a court and return a ball moving at this speed. If they're lucky they can reach it and react in time to hit it. I'm a bit confused by an article that claims tennis players can react to and return serves up to 160 miles an hour. I think evidence suggests that returning balls anywhere near this fast is dependent on analysing factors bef…
You're right that it's not possible to react if all the information you have is the trajectory of the ball after it leaves the racquet. Good players will subconciously be predetermining the path of the ball by looking at how the opponent is striking the ball.
Re: Why Is the Human Brain So Efficient? (2018)
#5World record tennis serve is 144 miles an hour and a human can't really move across a court and return a ball moving at this speed. If they're lucky they can reach it and react in time to hit it. I'm a bit confused by an article that claims tennis players can react to and return serves up to 160 miles an hour. I think evidence suggests that returning balls anywhere near this fast is dependent on analysing factors bef…
It doesn't specify who serves it at that speed either, could be some kind of "serving machine".
Re: Why Is the Human Brain So Efficient? (2018)
#6World record tennis serve is 144 miles an hour and a human can't really move across a court and return a ball moving at this speed. If they're lucky they can reach it and react in time to hit it. I'm a bit confused by an article that claims tennis players can react to and return serves up to 160 miles an hour. I think evidence suggests that returning balls anywhere near this fast is dependent on analysing factors bef…
It doesn't specify who serves it at that speed either, could be some kind of "serving machine".
I guess so. But I'd say humans would have no chance at this speed without another player to analyse visually.
Re: Why Is the Human Brain So Efficient? (2018)
#7This article contains inaccuracies and says almost nothing novel for your average hacker new reader.
Re: Why Is the Human Brain So Efficient? (2018)
#8World record tennis serve is 144 miles an hour and a human can't really move across a court and return a ball moving at this speed. If they're lucky they can reach it and react in time to hit it. I'm a bit confused by an article that claims tennis players can react to and return serves up to 160 miles an hour. I think evidence suggests that returning balls anywhere near this fast is dependent on analysing factors bef…
'Players have an intuition about where the ball is going to go without having to look at and analyse the flight of the ball.'
This is pretty easily observable with baseball players as well. After playing thousands of games while standing in the same (relative) place on the field I/they can anticipate where the ball is going to go based on a variety of variables in real-time... instantly.
Re: Why Is the Human Brain So Efficient? (2018)
#9One kind of efficiency which hasn't been talked about is the energy loss of things like state switching and keeping the current state enabled. I think that brains build on much more efficient primitives than the silicon transistors computer chips use and thus can perform far more computations for far less energy than a desktop CPU.
Another difference between CPUs and brains is that brains are much less general purpose. CPUs do run-time interpreting of instructions while brains process data in a more straightforward way like GPUs do. Many problems can be implemented into GPUs and they will run much faster. I'd argue that brains excel at such tasks while being harder at tasks that require lots of state to be kept around as well as conditional jumps like computing a hash function or compiling a program. CPUs excel at those tasks.
Re: Why Is the Human Brain So Efficient? (2018)
#10World record tennis serve is 144 miles an hour and a human can't really move across a court and return a ball moving at this speed. If they're lucky they can reach it and react in time to hit it. I'm a bit confused by an article that claims tennis players can react to and return serves up to 160 miles an hour. I think evidence suggests that returning balls anywhere near this fast is dependent on analysing factors bef…
'Players have an intuition about where the ball is going to go without having to look at and analyse the flight of the ball.' This is pretty easily observable with baseball players as well. After playing thousands of games while standing in the same (relative) place on the field I/they can anticipate where the ball is going to go based on a variety of variables in real-time... instantly.
50% of the time it works 100% of the time