Does bullet take a toll on your calculation skills?

Not Exactly: Correspondence, Classical, And Rapid Help In All Time-Controls, As - By Calculating Different Variations - You Will Gain A Better Understanding Of What Makes "Good-Moves" In Chess, So You Will Be Able To Make Good-Moves Faster In Bullet; Blitz Helps In Blitz, As Blitz Is Too Fast To Help In Rapid, Correspondence, And Classical, And Too Slow To Help In Bullet; Bullet Helps In Bullet, As Bullet Is Too Fast To Help In Blitz, Rapid, Correspondence, And Classical. 

Not necessarily true, at least in my own experience.

Time trouble usually comes about as you attempt to play good moves in faster controls. Once that kicks in, errors start to enter the game under time pressure. An empire of good moves built would have been ruined just because of these errors. In general, players who play rapid alone are often worse than players who play a mix of both if their long-control ratings are comparable.

More often than not, this is what I noticed when people face time trouble. And I believe this is what leads to Marcyful starting to incorporate bullet games as part of routine training.

As someone with only about 50,000 bullet games finished, I can say that it rewards slop in a way that can make my calculation in slower OTB superficial. On the other hand, in moderation bullet can test instant comprehension of patterns.

I’m also terrible at bullet.

I tried playing bullet, but it nearly killed my performance. I dodged a bullet right there. 

Put your rapid rating on the line in Arena and see if you can keep it above 1600. That’s what I’ve been doing the past eleven months. I was over 1900 when I started.

A tournament format. Usually set to last a set time like two hours, you play many opponents, getting paired as soon as another opponent is available. You get bonus points for streaks.

I usually pop in for a few games and then leave again, which is not among the advertised benefits. 

The part of the brain that is responsible  for logical thinking and planing is The frontal lobe.

The brain stem, which consists of the medulla (an enlarged portion of the upper spinal cord), controls the reflexes

No. The two kinds of thinking are very different, use different parts of our brain, and serve us best in contrasting situations.

See https://www.goodreads.com/book/show/11468377-thinking-fast-and-slow

@RoaringPawn discussed this book’s relevance for chess in one of his blog posts.

Very quick thinking is base more on intuition (experience and knowledge);but do you really think if you take 2 sec per move or do you start to think at +5 sec per move? and could you see all the board in 5 sec?

Depend if your an expert or master or a GM or a 1300 player...

At 1300 anyway you don't see much even if you think +10 sec.

In bullet you rely on memory and pattern recognition. There may be some superficial calculation. Stronger players remember more of relevance, apply it more appropriately, and know more patterns. Research suggests that they see the whole board, but in chunks.

This is illustration is from Alfred Binet’s study of expert chess players, published in 1894.

Binet’s early work has been further developed by Chase and Simon and others.

It’s all good.

I’ve played hyperbullet and many thousands of 1 0 games. There are several kinds of bullet players, who adopt different strategies. I sometimes try to play solid positional chess in bullet. It can be effective.

Knowing when to use premoves is also useful.

When your opponent’s clock is under five seconds, start sacking pieces with check. They will time out.

This doesn’t work in 2 1. 

Bullet doesn't hurt your calculation, it's just hard to switch from one time control to another.

One expert say that you cannot optimized both at the same time,if you optimize the part of the brain that control the reflex you automatically will not be able to optimized the one for deep thinking..it could be a matter of a maximum of brain cells that are available in the totality of the brain if that make sense?

I'll try to find the name of the expert that did that study a few years back.

Look at post #39. That may be the expert you are thinking of.

The dopamine release that comes from gaming is so powerful, say researchers, it can almost shut the prefrontal regions down. 

Practicing anything repetitively physically changes the brain. With time and effort, you get better at the specific task you're practicing

Those repetitive actions and thoughts stimulate connections between brain cells, creating neural pathways between different parts of your brain. The more you practice a certain activity, the stronger that neural pathway becomes. That's the structural basis of learning.

"Use it or lose it" applies not just to muscles in the body, but also the brain. Neural pathways that are not used eventually get pruned.

Welp... we all see what it did to the former world #2 and his age suggests he should definitely still be in his prime. 

Depends where the bullet gets ya.

We are not talking about GM or masters here....

But for the guy that started this topic and if he play dozens of blitz in a row and if that can affect his slower games.

Or to the one who only play blitz games online and that start to complain on this forum that despite having read many books for years and having played thousands of blitz games and asking why they are still only at 1400 here....

Or the broader question...if you play 50%/50%blitz and slow games, is it better to improve your slow games to play 25%/75% or 10%/90%....

Most expert/coach that i read say that blitz is for fun....and the slower you play if you analyze your games to see your mistakes and IF you look and play carefully each move that is the best way to get better( of course  books and video (on tactics and strategy and end game and opening and a coach on top is a even better ......very few do that and it's not the only way...playing a lot against better players is another option.