Why Faster Reactions Don't Win Gunfights

Reaction time is the most measurable thing about a competitive player and one of the least decisive. That sounds like a contradiction on a site that reports effects in milliseconds. It is the reason those milliseconds need context.

The anatomy of a reaction

Between an enemy appearing on screen and a shot leaving the barrel, several things happen in sequence:

1. The hardware delivers the image. Render time, the display’s refresh and pixel response. One frame at 240 Hz lasts 4.2 ms; at 144 Hz, 6.9 ms.
2. The retina transduces light and the signal travels to the visual cortex.
3. The brain decides what the stimulus is and whether it is a target.
4. The motor system plans and executes a flick and a click, and the mouse and game register it.

Step three is the remarkable one. In a classic experiment, Thorpe, Fize and Marlot (1996) flashed photographs for just 20 ms and asked people to respond only if the image contained an animal. Brain recordings diverged between animal and non-animal images about 150 ms after the image appeared. The visual system had done the hard part of recognition in that time, before any movement began.

Thorpe, Fize & Marlot, 1996

Moderate relevance to competitive play

Speed of processing in the human visual system

Nature 381:520–522 doi:10.1038/381520a0

Sample

Small laboratory sample, Healthy adults

Design

Go/no-go categorisation of natural photographs with EEG recording

Intervention

Photographs flashed for 20 ms; respond only if an animal is present

Result

EEG responses to target and non-target images diverged about 150 ms after onset, showing that complex visual categorisation can be completed within that window.

Limitations

Measures when the brain separates categories, not total reaction time, which also includes movement.

Follow-up work by the same group found that weeks of training on a set of photographs did not make this categorisation faster. The core visual speed limit looks hard to train. What does change with practice is everything around it.

Where gunfights are actually decided

If two players have reaction times within 20 ms of each other, other factors usually decide who wins:

• Crosshair placement. A crosshair already at head height on the angle the enemy will appear from needs no flick, only a click. A poorly placed crosshair adds a movement that can take longer than the entire reaction.
• Pre-aiming and prediction. A player who expects an enemy at a spot reacts to confirmation, not to surprise. That is a different and faster neural task.
• Information. Sound cues, team calls and timing knowledge turn a simple-reaction situation into one the player has already half-solved.
• Network and peeker’s advantage. Latency and server tick rates mean the player who moves first can see their opponent before that opponent sees them. That gap can be comparable to the reaction differences that players obsess over.

None of these appear on a reaction test.

What expertise research says

Sport science has studied this question for decades. In a meta-analysis of 42 studies and 388 effect sizes, Mann, Williams, Ward and Janelle (2007) found that experts outperform less skilled players on perceptual-cognitive tasks. They pick up cues earlier, anticipate better and search the visual scene more efficiently. Elite athletes are not mainly faster at reacting. They are better at knowing what is about to happen.

Action-game research points the same way. In a review, Dye, Green and Bavelier (2009) found that action video game players respond faster than non-players across many tasks without losing accuracy. Training studies suggested at least part of this is caused by play. Better players appear to extract information faster, which shows up as speed.

The proof from the sleep lab

The strongest evidence that raw reaction time is not decisive comes from an esports study. When Rocket League players stayed awake for about 29 hours, their PVT reaction time slowed by 48.6 ms and their lapses rose fivefold. Their match results did not significantly change (Smithies et al. 2024).

A 50 ms penalty that leaves win rates intact says something important. Skilled play has redundancy built in: positioning, anticipation and decision-making that absorb a slower trigger. Caffeine trials in FPS players point the same way from the other side. Caffeine made players faster in aim drills but did not make their clicks more accurate (Rogers et al. 2024).

So do milliseconds matter?

They do, but conditionally. Reaction time matters most in the narrow set of duels that are truly symmetrical: same information, same angle, same timing. At the highest level, where players have matching game sense, more duels look like that, and small speed edges compound.

For most players, the order of returns is clear. Crosshair placement, positioning and information shape far more engagements than reaction time does. Biology still matters, but mostly by keeping decision-making and vigilance from degrading, which is where sleep, fatigue and arousal management come in.

A faster response to a flashing light is a lab result. A won round is a system result.

References

1. Thorpe S, Fize D, Marlot C. Speed of processing in the human visual system. Nature. 1996;381:520–522. doi:10.1038/381520a0
2. Mann DTY, Williams AM, Ward P, Janelle CM. Perceptual-cognitive expertise in sport: a meta-analysis. J Sport Exerc Psychol. 2007;29(4):457–478. doi:10.1123/jsep.29.4.457
3. Dye MWG, Green CS, Bavelier D. Increasing speed of processing with action video games. Curr Dir Psychol Sci. 2009;18(6):321–326. doi:10.1111/j.1467-8721.2009.01660.x
4. Smithies TD, Toth AJ, Campbell MJ. The effect of total sleep deprivation on the cognitive and in-game performance of Rocket League esport players. Nat Sci Sleep. 2024;16:2183–2204. doi:10.2147/NSS.S470105
5. Rogers EJ, Trotter MG, Johnson D, Desbrow B, King N. Caffeine improves the shooting performance and reaction time of first-person shooter esports players. Front Sports Act Living. 2024;6:1437700. doi:10.3389/fspor.2024.1437700

NeuroFPS publishes scientific analysis, not medical advice. Nothing here is a recommendation to take any substance or a dosing guide. Responses vary between individuals; speak to a doctor or pharmacist before changing anything you take.