Domain: Healthcare — Human Physiology
Target concept: Swallowing: The laryngeal prominence moves upward during swallowing and returns to its original position afterward.

Video generation prompt: The subject sat upright. The camera focused on the laryngeal prominence. The subject held a small amount of water in their mouth and swallowed once. Close-up of the human neck during swallowing.

Evaluation guide:
(i) Target concept: Hyolaryngeal excursion during volitional swallowing
Minimum mechanism: Intact neuromuscular control of suprahyoid muscles (digastric, mylohyoid, geniohyoid) and thyrohyoid, enabling coupled hyoid and laryngeal elevation; passive elastic recoil restores resting position post-swallow.
(ii)Storyline: [Pre-swallow phase] Upright subject, neutral neck, laryngeal prominence at rest, clearly visible and stable in fixed frame; oral cavity shows water retention (lips closed, mild mandibular fullness). [Swallow initiation] Jaw stabilizes, pharyngeal constriction begins; prominence begins smooth, continuous upward displacement. [Peak elevation] Prominence reaches highest visible point (aligned with or above hyoid bone level), no lateral deviation. [Return phase] Prominence descends smoothly along same vertical path to identical pre-swallow position, confirmed by spatial relationship to sternocleidomastoid/clavicle landmarks. [Visibility constraint] Entire sequence captured from fixed anterior view; prominence never occluded; lighting enables consistent contrast against surrounding tissue.

Manual:
Experimental Procedure
1. Subject sits upright, facing forward.
2. Camera fixes tightly on anterior neck, centered on laryngeal prominence.
3. Subject holds a small amount of water in mouth (visible oral fullness).
4. Subject swallows once, without moving head or body.
Observation of Experimental Phenomena
The laryngeal prominence rises visibly during swallowing and returns to its original position afterward.
Summary of Experimental Principles
During swallowing, the hyolaryngeal complex elevates, causing the laryngeal prominence (thyroid cartilage) to move upward; it descends passively to baseline after bolus passage.

Prompt Grounding rubric:
level_1: No human subject appears in the shot, the anterior neck is not shown, the laryngeal prominence cannot be identified as a distinct raised structure, or no swallowing action is depicted; the camera is not aimed at the front of the neck.
level_2: A subject is upright and the neck is somewhere in frame, but it is not centered or close-up, or the laryngeal prominence is hidden by hair, a collar, or poor lighting so it cannot be seen clearly; there is no visible sign of held water or of a swallow being performed.
level_3: The subject sits upright with the anterior neck centered and close in frame; the laryngeal prominence is visible as a distinct protrusion; a bulge or wet gloss on the closed lips shows water is held in the mouth, and jaw/throat muscle engagement shows a swallow beginning; the camera stays pointed at the neck for the whole shot.
level_4: The subject sits upright with the anterior neck centered and close in frame, and the laryngeal prominence is clearly visible throughout; the swallow clearly starts and finishes within the clip; the mouth/lip fullness from held water is visible right before the swallow and is gone right after it; the subject performs no extra actions such as tilting the head, talking, or clearing the throat.
level_5: The subject sits upright with the anterior neck centered and close in frame, and the laryngeal prominence stays sharply visible against the neck skin for the entire clip; the held-water bulge appears only in the moments before the swallow and disappears the instant the swallow begins; exactly one swallow occurs, with no hesitation, restart, or repeated attempt.

Scientific and Causal Correctness rubric:
level_1: The laryngeal prominence shows no upward movement anywhere in the clip, or it only moves down, sideways, or rotates, or it stays still while the jaw moves on its own; there is no visible connection between the swallow and any movement of the prominence.
level_2: The prominence moves, but not the way swallowing physiology predicts, for example only a sideways shift with no upward component, or the upward movement happens clearly before or after the visible swallow instead of during it, or the prominence rises but never comes back down afterward.
level_3: The prominence moves upward during the visible swallow and comes back down after the swallow finishes; the movement is smooth and stays close to a vertical path, without any contradictory motion such as a downward tug or twist happening at the same time.
level_4: The prominence moves upward during the visible swallow and returns downward once the swallow finishes, staying close to a vertical path with no contradictory motion; in addition, the upward movement begins only once the swallow has visibly started (together with jaw stabilization and throat constriction), and the downward return finishes only after the swallow motion has ended, with no overshoot, oscillation, or pause once the prominence reaches its highest point.
level_5: The prominence's motion is essentially vertical with no noticeable sideways drift or twist; it begins rising only once the swallow has visibly started and returns downward only after the swallow ends, with no overshoot or pause at the peak; it rises in one continuous, unbroken motion to its peak and returns in one continuous, unbroken motion to its start; its position relative to the clavicle and sternocleidomastoid landmarks looks the same before the swallow and after it.

Spatiotemporal Consistency rubric:
level_1: Severe spatiotemporal break: the neck or laryngeal prominence region drops out of the shot and comes back, or jumps to a different position on screen; the shot cuts away and returns mid-swallow; the screen suddenly flashes or goes dark; the laryngeal prominence visibly fragments, warps, or melts into the surrounding tissue; motion freezes or stutters for more than three consecutive frames.
level_2: Moderate break: the camera visibly pans, tilts, or zooms while the subject is swallowing; the laryngeal prominence is blocked by a hand, hair, or clothing for more than a second; visible flicker or interlacing artifacts appear; the shadow under the jaw or along the sternocleidomastoid jumps to a new position with no matching change in the subject's pose or the camera.
level_3: Minor flaws that do not break the scene: a brief partial block (under half a second) of the laryngeal prominence; a slight brightness fluctuation with no color shift or blown-out highlights; the frame holds steady with only negligible drift; the neck's rise-and-fall motion looks physically natural, without floating, jerking, or sudden speed changes.
level_4: The laryngeal prominence is never blocked from view at any point, and the frame holds steady with only negligible drift as in level 3; in addition, there are no cuts, frame drops, or camera repositioning during the swallow; the camera viewpoint stays completely fixed, with no detectable shift or rotation; the shadow cast beneath the chin and along the sternocleidomastoid moves only as a direct consequence of the prominence's rise and fall, never shifting or flickering on its own; the swallowing motion is fluid and anatomically coherent throughout.
level_5: The camera viewpoint stays completely fixed and the prominence is never blocked from view, as in level 4; in addition, the prominence's rise and return show no visible stutter, strobing, or frame skips; the sense of depth in the neck is preserved with no flattening or warped perspective; the skin and cartilage surface keeps a continuous, natural look through the whole motion, with no shimmering, smearing, or sudden texture changes as the prominence moves.