Domain: Humanities and Social Sciences — Linguistics
Target concept: Drawing and Analysis Experiment of the Dynamic Pitch (F0) Contour

Video generation prompt: A speaker recorded the sound of a short vowel (/e/) using a microphone. The audio waveform is displayed on the screen. The software extracts the fundamental frequency (F0) and plots the F0 contour over time. The operator adjusts the pitch analysis settings and replays the sound, while the dynamic F0 contour is updated in real time.

Evaluation guide:
(i) Target concept: Real-time acoustic visualization of pitch dynamics in a monophthong vowel via microphone capture and algorithmic F0 extraction.
Minimum mechanism: Microphone transduces vocal fold vibration → analog/digital signal → software computes autocorrelation or cepstral pitch track → maps instantaneous F0 to time-aligned curve; parameter adjustment modifies analysis kernel → alters contour smoothness/resolution without breaking continuity.
(ii)Storyline: [Frame 0–2] Microphone placed near speaker; /e/ phoneme label appears; audio playback initiates → waveform emerges left-to-right. [Frame 3–5] F0 contour begins plotting synchronously with waveform onset, following its periodic structure. [Frame 6–7] Cursor moves to adjust parameter (e.g., slides sensitivity slider). [Frame 8–10] Contour instantly redrawing with updated morphology (same time extent, continuous line, no gap), confirming causal linkage between action and visual output. All events occur from fixed frontal viewpoint; no camera motion; all UI elements remain fully visible and spatially stable.

Manual:
Experimental Procedure
1. Speaker produces short vowel /e/ while microphone records.
2. Software displays real-time audio waveform.
3. Software extracts and plots fundamental frequency (F0) contour over time.
4. Operator adjusts pitch analysis setting (e.g., time window or pitch ceiling).
5. F0 contour updates dynamically in response.
Observation of Experimental Phenomena
- Waveform shows periodic oscillation during /e/ production.
- F0 contour is a continuous, time-aligned curve varying smoothly over the vowel.
- Adjusting analysis parameters causes immediate, coherent change in contour shape (e.g., smoother or more detailed).
Summary of Experimental Principles
- F0 reflects vocal fold vibration rate during voiced speech.
- Dynamic F0 contour captures pitch variation (intonation, stress) in real time.
- Pitch analysis settings control trade-off between temporal resolution and stability of F0 estimation.

Prompt Grounding rubric:
level_1: No microphone is shown, there is no indication that the /e/ vowel is being recorded or played back, no waveform trace appears on screen, no F0 contour plot appears, and no operator adjustment action of any kind is shown.
level_2: Only some of the setup pieces appear together: for instance a microphone or a waveform is visible but not both, or a waveform appears with no F0 contour plotted alongside it, so the microphone, the waveform, the F0 contour, and an adjustment action are never all on screen at the same time; if an adjustment action does appear, it happens before any waveform or contour is shown rather than during or after.
level_3: A microphone, a cue that the /e/ vowel is being played (such as a phoneme label or an audio icon), a live waveform trace, and an F0 contour plot are all visible together in the same shot; the operator performs at least one adjustment action (e.g., dragging a sensitivity slider or pressing a settings button), but the F0 contour shows no visible change right after that action.
level_4: The microphone, the /e/ playback cue, the waveform, and the F0 contour are all present together, and the operator's adjustment action is followed by a visible change in the F0 contour, but the waveform and the F0 contour are drawn over visibly different stretches of time, or the contour has a blank gap during part of the vowel.
level_5: The microphone is shown positioned at or held by the speaker; the /e/ playback cue is clearly present; the waveform is displayed continuously for the whole duration of the vowel; the F0 contour is plotted over that same span of time; and the operator's adjustment of a pitch-analysis setting (such as the analysis window length or the pitch ceiling) is immediately followed by the contour redrawing with no freeze, jump, or gap in the line. Whether the resulting contour shape is itself the scientifically correct response to that adjustment is a separate judgment, not scored here.

Scientific and Causal Correctness rubric:
level_1: The F0 contour is missing, perfectly flat, erratic, or constant even though the vowel is voiced; the waveform shows silence or noise instead of the periodic pattern expected from vocal fold vibration; the contour shows no relation to the waveform's cycles; or the contour appears before the waveform starts or after playback has already ended.
level_2: The F0 contour runs backward or upside down relative to how pitch actually moved, or jumps to a frequency far outside the normal range for a spoken /e/ (e.g., above roughly 1000 Hz); the waveform lacks the repeating cycle-to-cycle pattern expected of a voiced vowel; or the contour has abrupt vertical jumps that do not line up with any change in the waveform's periodicity.
level_3: The F0 contour varies over time and roughly tracks the span of the vowel; the waveform shows a repeating pattern consistent with voicing; the contour's values line up approximately with the waveform's repeating cycles, but the contour is jagged or has isolated spikes not tied to the waveform, and the adjustment action produces no visible change in the contour's shape.
level_4: The F0 contour is one continuous curve that varies smoothly and stays within a plausible pitch range for a spoken /e/; the waveform shows clear repeating cycles matching the contour's implied pitch; after the adjustment, the contour changes in the expected direction (for example, a larger analysis window gives a smoother curve, a smaller one reveals more short-term detail), with at most one small inconsistency, such as the contour starting slightly before or after the waveform's onset, or one point that breaks the overall trend.
level_5: The F0 contour is continuous and stays within the voiced part of the /e/ waveform, with each peak and dip in the contour corresponding to a matching change in the waveform's cycle-to-cycle period; the adjustment changes the contour only in ways consistent with pitch-analysis theory: for example, more smoothing removes short-term jitter without flattening the vowel's overall pitch trend, or lowering the pitch floor reveals lower F0 values without creating spurious dips, and no extraneous artifacts, gaps, or unrelated contour segments appear.

Spatiotemporal Consistency rubric:
level_1: The clip cuts abruptly between different camera setups; the microphone or the waveform/F0 panels disappear partway through and reappear later; the software display resets or reloads mid-clip; or the camera viewpoint changes with no visible transition.
level_2: One or more major inconsistencies occur: the waveform trace appears before the microphone is shown recording; the F0 contour is drawn backward in time, right to left; the operator's adjustment happens off-screen and the contour changes with no visible cause; or the interface panels change position or size between shots with no transition.
level_3: The microphone, the waveform panel, and the F0 contour panel all stay in the same on-screen spots throughout; the microphone and both display panels stay visible the whole time with no sudden disappearance or reappearance of any element; the waveform and F0 contour keep updating continuously through the recording and the adjustment; the operator's cursor action and the resulting change in the contour happen within one continuous shot, with only a minor hiccup, such as a brief pause in how the contour line is drawn or a short delay between the click and the contour beginning to respond.
level_4: The camera framing and panel layout stay fixed with no cuts or resizing; the microphone stays in place with a consistent orientation toward the speaker; the waveform scrolls or refreshes smoothly with no abrupt jump in its shape; the F0 contour is drawn progressively from left to right, keeping pace with the waveform's time axis; the cursor's drag or click during the adjustment is a continuous, visible motion ending at the new control position, apart from at most one small, clearly visible hiccup, such as the contour line stalling briefly before resuming.
level_5: There are no cuts, resets, disappearing panels, or reversed motion anywhere in the clip; the microphone stays fully visible and stationary; the waveform updates continuously with stable scaling for the whole vowel; the F0 contour is drawn as a single unbroken line moving left to right, staying aligned with the waveform's time axis throughout; the cursor's adjustment motion is smooth and ends exactly on the new slider or parameter position with no snapping; and the software's panels, buttons, and text stay sharply rendered throughout, with no flicker, warped edges, or redraw glitches anywhere in the interface.