Domain: Healthcare — Human Physiology
Target concept: Thoracic breathing

Video generation prompt: First, place one hand on the chest and perform slow thoracic breathing, observing from the side of the body.

Evaluation guide:
(i) Target concept: Thoracic breathing as a voluntary, observable respiratory pattern characterized by isolated upper-chest movement without abdominal involvement.
Minimum mechanism: Intact rib cage mobility, functional external intercostal muscles, stable posture, and conscious neuromuscular control to suppress diaphragmatic dominance.
(ii)Storyline: 1. Subject assumes static side-facing stance → 2. Hand moves into stable contact on upper chest → 3. Inhalation initiates bilateral, smooth upper-chest expansion (hand rises slightly with tissue) → 4. Exhalation triggers synchronous, complete upper-chest contraction (hand lowers with tissue) → 5. Abdominal region remains visually still throughout all phases; all transitions occur within a fixed side-view frame with consistent lighting and no occlusion of chest contour.

Manual:
Experimental Procedure
1. Stand upright, facing sideways to camera.
2. Place one hand flat on upper chest (clavicular region), fingers pointing upward.
3. Inhale slowly through nose, expanding upper chest outward; exhale slowly through mouth, contracting upper chest inward.
Observation of Experimental Phenomena
Side view shows rhythmic, bilateral expansion and contraction of upper chest region under hand; abdominal region remains motionless.
Summary of Experimental Principles
Thoracic breathing engages intercostal muscles to elevate ribs, increasing anteroposterior and transverse thoracic diameter—distinct from diaphragmatic breathing, which primarily moves the abdomen.

Prompt Grounding rubric:
level_1: None of the three setup elements is present: no hand ever touches the chest, the camera is not filming from the side of the body, and the torso shows no rhythmic rise-and-fall motion at all.
level_2: At most one of the three setup elements is clearly present, for example the hand touches the chest but the camera films from the front rather than the side, or the camera is side-on but the hand never contacts the chest and the torso shows no rhythmic motion, or the torso rises and falls rhythmically but with no hand on the chest and no side framing.
level_3: All three setup elements occur at some point in the clip (the hand contacts the chest, the camera shows a side view of the torso, and the torso undergoes at least one visible rhythmic rise-and-fall), but at least one is unreliable, e.g., the hand touches the chest only briefly before moving away, the camera swings toward a frontal or three-quarter angle for part of the clip, or only a single rise-and-fall cycle appears before motion stops.
level_4: The hand is on the chest for most of the clip, the camera keeps a side-on view of the torso for most of the clip, and the torso completes at least two visible rhythmic rise-and-fall cycles, but one element is imperfect, such as the hand relocating to a different spot on the chest partway through, the camera drifting a few degrees away from a pure side view, or one cycle being noticeably briefer or slower than the others.
level_5: The hand is placed on the chest at the start and remains there for the full clip, the camera holds a side-on view of the torso from the first frame to the last, and the torso shows continuous, evenly paced rhythmic rise-and-fall motion for the entire duration with no gaps in any of the three setup elements.

Scientific and Causal Correctness rubric:
level_1: The torso shows no chest expansion at all during the clip, or the visible rise-and-fall motion is dominated by the abdomen while the upper chest stays flat, or the chest visibly caves inward during what should be an inhalation, none of which is consistent with thoracic breathing.
level_2: The upper chest does move, but its timing contradicts thoracic breathing mechanics: for example the abdomen rises and falls with clearly greater amplitude than the chest, or the chest appears to contract at the same moment the abdomen expands rather than moving together with the breathing cycle.
level_3: Upper-chest expansion and contraction are visible and roughly track a breathing rhythm, but the abdomen also rises and falls with an amplitude comparable to the chest, so the pattern reads as mixed chest-and-abdomen breathing rather than breathing isolated to the chest.
level_4: Upper-chest expansion clearly dominates the breathing cycle and the abdomen stays largely still, with chest rise-and-fall timed to a plausible slow breathing rate, but one imperfection remains, such as one side of the chest expanding noticeably more than the other, or the abdomen showing a small but visible rise on one cycle.
level_5: Upper-chest expansion is bilateral and is clearly the dominant motion of every breathing cycle, the abdomen stays visually still across all cycles, and the pace of chest rise-and-fall matches a slow, even breathing rate consistent with the instruction to breathe slowly using the chest.

Spatiotemporal Consistency rubric:
level_1: The hand vanishes from its contact point on the chest and appears already repositioned elsewhere with no motion shown in between, the torso's shape breaks (e.g., the rib cage appears to stretch, twist, or the shoulder separates from the torso), the shot cuts abruptly to a different pose or framing, the lighting on the torso shifts abruptly between frames with no visible cause (e.g., a sudden bright-to-dark change), or the background behind the subject flickers or changes without the camera moving.
level_2: The hand's point of contact on the chest shifts abruptly between two moments without a visible transition (while staying somewhere on the chest), or the torso's outline briefly warps (e.g., the chest appears to widen or narrow unnaturally between adjacent moments), or the clip freezes for a beat and then jumps ahead.
level_3: The hand or its fingers flicker briefly at the point of contact (e.g., the visible number or shape of fingers changes for an instant) without the hand fully jumping position, and the torso's outline stays basically stable overall, with no full freeze or jump in the clip.
level_4: The hand's contact with the chest reads as continuous and the torso keeps an anatomically coherent, stable silhouette throughout, with the side-view framing steady, but one small artifact appears, such as a brief soft blur where the hand meets the chest during a fast expansion, or a very slight drift in camera angle that never breaks the side view.
level_5: The hand stays in continuous, stable contact with the chest for the entire clip, the torso's proportions and outline stay anatomically coherent and consistent with the same body in every frame, the side-view framing never breaks or jumps, and the chest's rise-and-fall motion is smooth and continuous with no freezing, jumping, or warping at any point.