Hueecho

What Hueecho trains

Hueecho works your short-term color memory: holding one exact shade in mind across a pause, then rebuilding it with nothing to compare against. The reference is gone by the time you answer, so the only thing between the color you saw and the color you produce is what your memory kept. That is the situation whenever the swatch you are matching is in another room, another tab, or on a screen you already closed.

How to play

Press Start to begin. Each round runs the same three beats. A short neutral pre-roll, so the flash is never missed. The target shade then fills the stage for about a second and a half, under the prompt Watch the color…. It then vanishes into a blank screen showing three dots and the prompt Remember it…, with no visual anchor left. Finally the slider unlocks: Reproduce it. Move it across the 0-100 lightness range, watch the stage repaint live in that round's hue, and press Lock in echo. There are four rounds, each in a clearly different hue, and the retention gap grows from about two seconds to nearly four by the last round.

How scoring works

Each round scores the absolute distance between the lightness you produced and the lightness you were shown, divided by the round's tolerance and turned into an accuracy from 0 to 100. The tolerance tightens each round, so a late round is less forgiving. Your daily result is the average of the four. At or above 85 the round is marked as spot-on on the result strip, the middle band as a near miss, and anything lower as a miss. Score 60 or more and your streak continues. Miss the spot-on threshold and the stage repaints in the true color, so you see what you were holding before you continue.

What your score means

Read the daily number as a band, not a measurement:

One day is noisy: fatigue, room light and a badly timed distraction during the pause all move the number. The trend across many days is the honest signal.

Common mistakes

The big one is anchoring on the slider's starting position. It always opens in the opposite half of the lightness range, at least thirty steps from the answer, so nudging cautiously from where it lands leaves you short every time. Move decisively into the right region first, then refine. A second mistake is using a word instead of an image: labelling the target "dark teal" compresses everything dark-and-teal into one bin, and your answer lands at the middle of the category rather than at the shade you saw. Third, looking at something bright during the pause disturbs the trace, so keep your eyes on the blank stage. Fourth, waiting until the slider unlocks to decide wastes the retention window; commit to a value while the gap runs.

Practice progression

(5 min, beginner) Play today's rounds and, during each pause, rehearse the shade as a position, something like "just above the middle" or "near the dark end", rather than as a name. (10 min, intermediate) In the practice tab, reach your answer in one confident move with no fine-tuning, and compare that score with a session where you fine-tune freely. (weekly) Rotate through the memory games, Huemory and Huember, and read color memory and recall to see why the drift has a shape.

The science behind it

What you are measuring is visual working memory for a continuous feature. Delayed color matching has probed it since Nilsson and Nelson measured remembered hue across delays from a tenth of a second to twenty-four seconds: they found only small shifts, and those shifts followed no consistent trend, which led them to describe the store as remarkably unbiased. Later work does find structure in the errors. Bae and colleagues showed that memory for a color combines a noisy record of the shade itself with the pull of a color category, which is why errors bend toward category centres. On the axis this game actually scores, Olkkonen, Saarela and Allred had observers compare the lightness of two stimuli across a delay and found that memory pulled perceived lightness toward the mean of the whole set of stimuli, the same inward drift you feel when a remembered shade lands nearer the middle of the range than it should. The game keeps saturation muted so that the signal is carried by lightness, the axis described in hue, saturation and lightness.

Limitations

Hueecho is a game and an informal self-check, not a clinical or diagnostic tool. It runs on an uncalibrated screen in an uncontrolled room, so scores from two devices are not comparable. It probes one narrow thing: lightness memory over a few seconds, with no interference task. It is not a measure of memory in general, and a weak day is far more likely to be tiredness or a distraction during the pause than anything about your vision.

Where it shows up

Holding a color across a gap is everyday work the moment the reference stops being in front of you. A decorator carries a wall color to the shop and compares it with paint chips under different lighting an hour later. A designer sees a brand color in a printed guideline, then reaches for a swatch in an editor on the next screen. A tailor matches thread to a garment still on the workbench in the other room. A restorer glances between a patch and the fill they are mixing for it. In each case the comparison is not simultaneous, and the gap is where the error creeps in: the remembered version is a little more typical, a little closer to the idea of the color than the color itself. Knowing the drift has a direction turns the situation from guesswork into procedure: photograph the reference, carry a physical sample, check under the light that matters. Hueecho makes that gap visible four times a day, so you can see how far your own echo travels in a couple of seconds.

Related reading & games

• Color memory and recall: how a remembered shade drifts, and in which direction.
• How the eye sees color: what the trace is made of before memory takes it.
• Huemory (pairs from memory) and Huember: the neighbouring memory games.

Sources: Bae, G.-Y., Olkkonen, M., Allred, S. R. and Flombaum, J. I. (2015), Why some colors appear more memorable than others: A model combining categories and particulars in color working memory, Journal of Experimental Psychology: General 144(4), 744-763; Nilsson, T. H. and Nelson, T. M. (1981), Delayed monochromatic hue matches indicate characteristics of visual memory, Journal of Experimental Psychology: Human Perception and Performance 7(1), 141-150; Olkkonen, M., Saarela, T. P. and Allred, S. R. (2016), Perception-memory interactions reveal a computational strategy for perceptual constancy, Journal of Vision 16(3):38.