Keyboard vs Mouse vs Touch Reaction Time

Keyboard, mouse, and touch can all submit a reaction-time response, but they are not the same measurement. The input method changes the movement, switch behavior, event path, and error risk. That is why your reaction time test baseline should name the input device.

For a repeatable desktop visual baseline, keep the same mouse and connection on the visual reaction time test. If you want to track your phone, use the same phone and same tap posture every time.

Mouse input

A mouse is a practical default for desktop visual reaction-time testing: you can rest your hand, keep the cursor inside the target, and respond with a short finger movement. That is a protocol choice, not evidence that every mouse is faster than every keyboard.

The mouse is still part of the latency stack. Switch behavior, wireless mode, polling rate, operating-system processing, and browser event delivery can affect the result. A polling-rate label describes report frequency, not total physical click latency or human reaction time. For example, at 1,000 Hz, interval_ms = 1000 / 1000 = 1 is a calculated report interval, not a measured 1 ms click. Microsoft's USB endpoint documentation defines the polling interval; it does not benchmark the whole click path.

For choosing a device, use the mouse latency buying criteria. For the complete cue-to-response path and an idealized polling calculation, read input lag vs reaction time.

Keyboard input

Keyboard input can be useful when you want a fixed finger position and do not want the pointer position to matter. It is also useful for accessibility and for users who naturally respond with a key press.

The tradeoff is that key actuation and hand posture change the action being measured. Firmware can also change how a switch press is processed: QMK's debounce documentation describes eager and deferred algorithms for mechanical switches. It is an implementation example, not a latency specification for your keyboard. Keep the same key and finger position, and use keyboard results as a separate baseline.

WiredReflex accepts Space or Enter through keydown, ignoring auto-repeat. Mouse and touch responses use pointerdown, not a release-time click. The W3C keyboard event definition and pointerdown definition describe different input events; sharing a timestamp format does not make the underlying physical actions equivalent.

Touch input

Touch results should be compared with other touch results, not with desktop mouse scores. A touch response includes finger travel toward the glass, target size, screen sampling behavior, gesture handling, and mobile browser constraints. It can be very repeatable on one phone while still being different from a mouse result.

This is especially important for reaction-time pages because the tap target must be large enough to avoid accidental misses. The W3C/WAI target-size guidance exists because small or crowded touch targets create activation problems. For WiredReflex, the important lesson is simple: do not treat a phone tap and a mouse click as the same motor action.

Compare inputs without pretending to benchmark switches

Use the visual test linked above on one desktop to compare mouse A with keyboard B. Keep the same display, refresh rate, browser, power mode and seat position. Rest the mouse finger on the button and the keyboard finger on the chosen key without actuating either. Use only one response method per run.

After one practice run per input, record four five-trial runs in A-B-B-A order; after a break, use B-A-A-B. Keep every run's median, spread, valid-trial count and false starts, rather than selecting the fastest click. Record the device model, connection and exact key/button so you can repeat the comparison another day. These run counts are a practical starting point, not proof of statistical significance.

A difference could reflect finger movement, posture, practice or device delay. It does not identify switch latency or show that your brain became faster. If the direction does not repeat or the gap is small relative to run-to-run variation, report an inconclusive comparison. Switching to a phone also changes the display and platform, so keep that as a separate touch baseline rather than calling it an isolated input-method experiment.

Which input should you use?

If you need cross-device comparison, use the device comparison protocol and run multiple sessions.

Sources & context

The primary USB, firmware and event references above describe mechanisms, not a ranking of devices. W3C/WAI's target size guidance explains why touch activation needs enough space and separation. WiredReflex reads each supported input event's timestamp — how we measure documents the boundary. Browser timing resolution does not calibrate physical input latency, and a browser comparison is not a hardware benchmark.