Word Reading Comprehension - Image Selection
●ValidatedPlatform: HTML · German · · verified 67d ago
Description
Pixi.js + TypeScript educational game built for the LEAPS Zurich learning-progress study. The child sees a German word (e.g. "Tor") or a short sentence (e.g. "Der Bus ist blau.") together with four candidate images and taps the one that matches; the target text is also played as audio for support. The task ships as a multi-scene flow — two animated demo trials, three practice trials with feedback, a transition, then 60 main test items, finishing on an end scene that bundles the data. The test scene caps at 7 minutes and shows a 'stop frog' early-exit overlay after 30 seconds of inactivity. Each trial logs the four shown images, every press/release event, every audio replay, the final selection, and per-trial timestamps.
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Task Outputs
Reading comprehension at the word and short-sentence level: how well a child maps written German text onto a depicted referent. Audio support disentangles decoding from comprehension when needed.
scene- Test accuracy (% correct on the 60 test items)
- Practice accuracy (% correct on the 3 practice items)
- Mean response time per trial (ms)
- Audio replays per trial (proxy for decoding difficulty)
- Selection-revision count (selections.length per trial: how often the child changed their mind)
- Stop-frog rate (proportion of sessions terminated early by inactivity / explicit stop)
| Variable | Role | Type | Description | Unit |
|---|---|---|---|---|
practice | dependent | object | SceneResult for the practice phase, or a StopFrogResult if the child exited early. Null if practice was skipped via routing. | - |
teststar | dependent | object | SceneResult for the test phase, or a StopFrogResult if the child exited early (7-min timeout, 30 s of inactivity, or pressed the stop frog). Null if skipped. | - |
answers | dependent | array | Inside each SceneResult: an AnswerResult per trial (see fields below). | - |
totalCorrect | dependent | number | Inside each SceneResult: count of correct answers in that scene. | - |
totalTime | metadata | number | Inside each SceneResult: total time spent in the scene. | ms |
reference | independent | string | AnswerResult field: the target text shown to the child (a German word or short sentence). | - |
trialIndex | metadata | number | AnswerResult field: 0-based trial index within the scene. | - |
startTimestamp | metadata | number | AnswerResult field: timestamp when the trial started. | ms |
endTimestamp | metadata | number | AnswerResult field: timestamp when the green-arrow submit was clicked. | ms |
answerOptions | independent | array | AnswerResult field: the four images shown, each with imageFilename, isTarget (true for the correct option), and choiceIndex (1=top-left, 2=top-right, 3=bottom-left, 4=bottom-right). | - |
audioPlaybacks | metadata | array | AnswerResult field: every time the audio of the target was played, with timestamp and audioFile. A single trial can have several entries (the child can replay). | - |
selections | dependent | array | AnswerResult field: every click on an option, with timestamp, choiceIndex, and isFinal (true for the one submitted). | - |
isCorrectstar | dependent | boolean | AnswerResult field: whether the final selection matched the target. | - |
responseTimestar | dependent | number | AnswerResult field: time from trial start to final-submit click. | ms |
Provenance
Source: nccr-seed
Fetched: 2025-09-15
Last verified: 2026-05-11 — passed