Auditory vs Visual Reaction Time: Which Is Faster?
You react faster to sound than to light. In lab studies, auditory reaction time averages about 140-160 milliseconds and visual reaction time about 180-200 milliseconds, so sound usually wins by roughly 30 to 50 milliseconds. The usual explanation is that a sound signal reaches the brain in about 8-10 milliseconds, while a visual signal needs 20-40 milliseconds just to get there.
The gap is small, and you can measure your own version of it in a couple of minutes.
The numbers side by side
The figures above come from Robert Kosinski's literature review on reaction time at Clemson University, which pulls together more than a century of lab work. Touch lands in between, at about 155 milliseconds.
| Signal | Typical lab reaction time | Time for the signal to reach the brain |
|---|---|---|
| Sound | 140-160ms | 8-10ms |
| Touch | ~155ms | n/a |
| Light | 180-200ms | 20-40ms |
Individual studies land on different absolute numbers because the equipment and the people differ. Sound still tends to come out ahead. A 2010 study by Shelton and Kumar measured 14 people on a computer and found a mean of about 284ms for sound and 331ms for sight, a gap of roughly 47ms. A 2015 study of 120 medical students found auditory reaction time significantly faster than visual in both men and women.
Those computer-based numbers are higher than the classic lab figures, which is normal. Kosinski notes that reaction times measured on a computer in his own lab usually come out near 268ms for a simple visual signal, well above the textbook 190ms. Screens, keyboards, and software all add delay. Compare sound and sight on the same setup and the comparison stays fair.
Why sound is faster than sight
A reaction is a chain. Your senses pick up a signal, a nerve carries it to the brain, the brain decides to move, and a command goes back down to your muscles. Most of the difference between sound and sight comes at the first step.
Your ear turns sound into a nerve signal mechanically. Tiny hair cells in the inner ear bend as sound waves arrive, and that movement fires the nerve almost at once. Your eye has more to do: light hitting the retina sets off a series of chemical steps before any nerve signal exists. Kosinski's review points to this early stage as the likely reason the visual signal takes 20-40ms to reach the brain while the sound signal takes 8-10ms.
Shelton and Kumar make the same argument: the sooner a signal reaches the motor cortex, the part of the brain that starts movement, the sooner you react. Sound gets there first.
The review also notes that the difference holds whether the task needs a simple response or a more complex one, so sound keeps its lead when you have to make a decision too.
Where you see it in real life
Track and field is the clearest example. Sprinters react to a starting gun, not a light. At the 2008 Beijing Olympics, the average reaction off the blocks was 166ms for men and 189ms for women. World Athletics treats any start under 100ms as a false start, because a real reaction to the gun can't be that fast.
Formula 1 starts work the other way. Drivers wait for five red lights to go out, a visual signal, and according to Formula 1 they launch their cars about 0.2 seconds after lights out on average. Launching a race car is a different movement from pushing off a block, so this isn't a clean comparison, but it fits the pattern.
Audio-visual reaction time: what happens with both signals at once
If a light and a sound arrive together, you react faster than you do to either one alone. Psychologists call this the redundant signals effect. In a 1982 study in Cognitive Psychology, the psychologist J. Miller showed that responses to a combined light and tone were faster than a simple "whichever signal arrives first wins" model could explain. His explanation was that the two signals add up in the brain before you move.
Not every study agrees
The sound advantage shows up in most of the research, but not all of it. A small 2021 study in the Ohio Journal of Science, with 12 people in each group, found auditory reaction times slower than visual ones on its own sound cue test. With a gap this small, equipment and task design can flip the result, so your own numbers depend on how you test.
How to test it yourself
Take the auditory reaction test, then the visual reaction test on the same device, a few minutes apart. If the research holds for you, your sound median will come out faster.
A few tips for a fair comparison:
- Use wired headphones or your device's built-in speaker. Bluetooth audio can add delay between the signal and the sound you hear, which would hide your real advantage.
- Set the volume so the tone is clear. Kosinski's review notes that weak signals produce slower reactions until they reach a certain strength.
- Use the same hand and the same input, both times.
Your visual score will probably sit in the usual online range of about 250-300ms. The average reaction time page shows where that falls by age, and what affects reaction time covers the other factors, like sleep and caffeine, that move both numbers.
Frequently asked questions
Is auditory reaction time faster than visual?
Yes. In lab studies, people react to sound in about 140-160ms and to light in about 180-200ms. Sound usually wins by around 30 to 50 milliseconds because the signal reaches the brain faster.
What is the average sound reaction time?
About 140-160ms in lab studies. Online tests add delay from your speakers, browser, and input device, so a browser score will usually be higher. Compare your sound score with your own visual score on the same device rather than with lab numbers.
Why do we react faster to sound than light?
The ear turns sound into a nerve signal mechanically, and that signal reaches the brain in about 8-10ms. The eye has to run a chain of chemical steps in the retina first, so a visual signal takes 20-40ms to arrive.
Do you react faster to sound and light together?
Yes. When a sound and a light arrive at the same time, people respond faster than to either one alone. This is called the redundant signals effect, and Miller described it in a 1982 study.
How do I test my auditory reaction time?
Use the auditory reaction test with wired headphones or your device speaker, then take the visual test on the same device. Use your median over five tries for each, and compare the two.