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Sentence Memory Test

Study, hide, and type eight audited English target sentences with visible-time safeguards, word-level edit feedback, and no ability claims.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Start a round and study the complete target during its six seconds of visible time, or hide it earlier when ready.
  2. 2.Type the sentence from recall and submit; after a mismatch, inspect the word-level edits and reveal the same target again.
  3. 3.Complete all eight fixed targets and interpret errors, token edits, and points only within this recreational route.

About Sentence Memory Test

Sentence Memory Test is an eight-round show, hide, and type game. Each round displays one complete English target for six visible seconds. You may hide it earlier when ready. After the sentence is covered, type what you remember and submit it for a word-level comparison. A perfect match advances to the next target. A mismatch shows a minimal alignment of matching, substituted, inserted, and missing words, then lets you reveal the same target and try again.

The eight target sentences were written for this product rather than copied from a dictionary or corpus. The route is still conservatively treated as reference data under the G4 English sentence-bank rule. Each sentence's central verb and argument pattern is anchored to a pinned Princeton WordNet 3.1 sense key and sentence-frame number, then independently checked on an exact Cambridge Dictionary verb page. Cambridge definitions and examples are not stored or reproduced. The published WordNet 3.1 Copyright 2011 notice preserves the primary source terms.

Targets include people following a guide, arranging postcards, stacking boxes, mailing a parcel, renting bicycles, faxing a form, chopping carrots, and enjoying a concert. The details make each sentence distinct without asserting a changing real-world fact. Tests freeze all eight literal targets, normalized token strings, sense keys, and template numbers. The production route must match those independent cases exactly, so it cannot pass by constructing its own expected answers.

Comparison uses a disclosed narrow normalization policy in a fixed order. The input first receives Unicode NFKC compatibility normalization, then lowercasing and Unicode outer trimming. Repeated internal ASCII whitespace is collapsed, and one final period, question mark, or exclamation mark is ignored. Interior punctuation is not silently deleted, words are not reordered, and no synonym is substituted. A dynamic-programming token alignment finds a minimal sequence of matches, substitutions, insertions, and deletions. That matters because one omitted word should not make every later word appear wrong, and a repeated word must be aligned consistently.

The six-second reveal uses a monotonic browser deadline rather than assuming a timer callback fires at an exact instant. If the document becomes hidden during study, the round pauses and preserves only the remaining visible time. Opening the shared boss screen is detected at the document boundary and pauses the same way; after either pause, Resume creates a new deadline when the page is visible again. A backward timestamp, stale timeout, or old interaction token is rejected. Entry itself is untimed, so typing speed does not affect the result. The summary reports completed sentences, total mismatches, cumulative token edits, and points from the fixed route rather than a response-time rank.

Points begin at 800. A mismatched submission stays on the same sentence, adds one error, and costs up to 25 points, never below zero. Continue reveals that sentence again with a fresh visible token. A match advances exactly once. Start, Hide, Resume, Submit, Continue, Restart, keyboard shortcuts, visibility events, and timer expiry all use guarded transitions. Held keys, duplicate clicks, old-round events, input after completion, and user controls hidden under the spreadsheet-style boss screen cannot mutate the game; only the system pause may preserve remaining visible time.

The target card, text area, diff list, and controls use written labels and do not rely on color alone. Live status announces phase changes, and the single-column content wraps on a 390-pixel viewport. There is no microphone, synthesized voice, audio recording, runtime dictionary request, account, or uploaded text. The shared shell may remember a best point total locally, but it does not save the sentence attempts or create a memory profile.

This is an entertainment exercise, not a clinical/IQ/cognitive assessment. It does not measure working-memory capacity, diagnose a cognitive or language condition, estimate intelligence, assign a percentile or CEFR level, establish school or employment readiness, or show that practice improved the brain. Familiarity makes the repeated route easier, and the sentences are not normed. Use the feedback as a transparent comparison with text that was just shown, not as a health, ability, placement, treatment, or professional conclusion.

Methodology & sources

Use exactly eight original ASCII target sentences. Pin each central verb to a WordNet 3.1 sentidx.vrb sense key and sents.vrb template, and independently cross-check the usage on an exact Cambridge page without copying Cambridge text. Normalize NFKC, lowercase, collapsed ASCII whitespace and one terminal punctuation mark, then compute a pure minimal token edit alignment. Reveals use injected monotonic deadlines; hidden study phases pause with bounded remaining time and explicit resume. Reject backward clocks, stale/duplicate tokens, repeated keys, boss-overlay actions and terminal input. Literal EXTERNAL_GOLDEN_CASES freeze all targets, tokens and anchors.

Frequently asked questions

How to play Sentence Memory Test?
Show one sentence for up to six visible seconds, hide it, and type the target from recall. Submit for a word-level comparison; after a mismatch, review the edits and show the same sentence again before retrying.
What happens if I switch tabs while the sentence is visible?
The reveal pauses and preserves the remaining visible study time. You explicitly resume after returning, so hidden time is not counted as extra viewing time.
Does Sentence Memory Test measure working memory or intelligence?
No. It is an eight-sentence repeated entertainment route with no norm group, clinical protocol, percentile, diagnosis, IQ scale, or ability interpretation.

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