Catch the Bubble: Наука про час реакції

A game that quietly measures your nervous system

Every tap on a bubble in this game is a measurement of reaction time: the interval between a stimulus appearing (the bubble) and a completed motor response (the click). For a simple visual stimulus with a single expected response, human reaction time typically lands around 200 to 250 milliseconds — and that quarter-second is not one delay but the sum of several separate stages the signal has to pass through in sequence.

Where the time actually goes

The reaction time is measured by how quickly a player can respond to a visual stimulus, such as a bubble moving towards them. This involves a complex interplay of neural processes, including sensory perception, motor planning, and execution.

The speed at which a player reacts directly correlates with the perceived 'time' taken for the response. Faster reactions are attributed to greater efficiency in these neurological pathways.

This is often represented visually within the simulator as a delay between the stimulus (e.g., bubble movement) and the player’s action (e.g., tapping the screen). The length of this delay is what determines the perceived reaction time.

retina + optic nerve transduction      ~20-40 ms
visual cortex processing               ~50-100 ms
decision + motor planning              ~50-100 ms
nerve conduction to the hand           ~10-20 ms
muscle activation + finger movement    ~30-50 ms
                                        -------------
                                        ~200-250 ms total

Why a moving target is harder than a flashing light

A plain reflex test (one stimulus, one response) measures simple reaction time. As soon as there is more than one possible target, or the player has to decide which bubble to hit, reaction time grows according to Hick's law, which says the time needed scales with the logarithm of the number of choices:

RT = a + b * log2(n) (n = number of equally likely choices) Popping a moving bubble adds a further predictive component on top of raw reaction time: the brain has to extrapolate the bubble's trajectory and time the click to intercept where it will be, not where it currently is — the same anticipatory skill used in catching a ball.

RT = a + b * log2(n)     (n = number of equally likely choices)

The speed-accuracy tradeoff

Once the target has to be hit precisely rather than merely detected, Fitts's law takes over, describing how long an accurate pointing movement takes as a function of the distance to the target and its size:

ID = log2(2D / W) (index of difficulty: D = distance, W = target width) MT = a + b * ID (movement time grows with the index of difficulty) Smaller, faster-moving bubbles raise the index of difficulty on both counts — less room for error in aim, and less time available before the target moves again — which is exactly why the game gets harder as bubbles shrink and speed up rather than by any arbitrary difficulty knob.

ID = log2(2D / W)     (index of difficulty: D = distance, W = target width)
MT = a + b * ID       (movement time grows with the index of difficulty)

What the difficulty ramp is really training

Every increase in bubble speed and decrease in bubble size pushes the same two systems the numbers above describe: faster visual processing and tighter visuomotor precision under time pressure. That is not incidental — the same combination of simple reaction time, choice reaction time and Fitts's-law pointing accuracy is exactly what sports-vision and hand-eye coordination training protocols measure and try to improve, just packaged here as a game rather than a lab test.

Frequently asked questions

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