Domain: Healthcare — Human Physiology
Target concept: Abdominal breathing

Video generation prompt: First, place one hand on the abdomen and breathe slowly, observing from the side of the body.

Evaluation guide:
(i) Target concept: Diaphragmatic breathing can be visually confirmed via synchronized abdominal displacement under static hand placement in side view.
Minimum mechanism: The diaphragm must descend during inhalation, displacing abdominal contents forward; this requires intact neuromuscular control, compliant abdominal wall, and absence of restrictive pathology (e.g., ascites, rigid abdomen); hand must remain passive and non-compressive to allow natural excursion.
(ii)Storyline: [Phase 1] Static setup: subject upright, side-on to camera, one hand placed on lower abdomen; visible, unoccluded, contact established. [Phase 2] Inhalation onset: abdominal surface begins outward displacement *before or simultaneously* with visible ribcage/chest stability; hand translates outward *with* tissue, no slippage. [Phase 3] Peak inhalation: maximal abdominal protrusion achieved; chest unchanged; hand fully adherent. [Phase 4] Exhalation onset: abdominal surface begins inward displacement; hand retracts *with* tissue. [Phase 5] End-exhalation: abdomen returns to baseline contour; hand rests in original contact position. Visibility constraint: entire sequence must be captured in uninterrupted side view; hand and abdominal contour must remain in focus and unoccluded at all times.

Manual:
Experimental Procedure
1. Position subject in relaxed upright stance, facing perpendicular to camera.
2. Place one hand flat on lower abdomen (below ribcage, above pelvis).
3. Inhale slowly through nose → observe abdominal expansion outward.
4. Exhale slowly through mouth → observe abdominal contraction inward.
Observation of Experimental Phenomena
Abdomen rises visibly during inhalation and falls during exhalation, while chest and shoulders remain motionless; hand moves synchronously with abdominal surface.
Summary of Experimental Principles
Abdominal (diaphragmatic) breathing engages the diaphragm as primary inspiratory muscle, causing caudal displacement and dome flattening → increases intra-abdominal pressure → expands abdomen outward; hand placement provides tactile-visual feedback to confirm diaphragmatic dominance over accessory muscles.

Prompt Grounding rubric:
level_1: No hand placed on abdomen; no visible diaphragmatic breathing action; no side-view framing; zero alignment with posted_prompt demonstration goal.
level_2: Hand appears near torso but not in contact with abdomen; breathing motion is absent or non-diaphragmatic (e.g., only chest rises); side-view framing is missing or inconsistent (e.g., front or overhead view dominates).
level_3: One hand is placed on the abdomen and remains in contact throughout; slow breathing motion is visible; side-view framing is established and maintained for majority of video; however, either (a) hand placement is ambiguous (e.g., overlapping ribs), or (b) abdominal expansion is not visually distinguishable from general torso movement.
level_4: One hand is clearly placed on the lower abdomen (below ribcage, above pelvis); side-view framing is stable and unambiguous; slow inhalation/exhalation is visibly associated with abdominal rise/fall; no misplacement, occlusion, or viewpoint shift; only one minor flaw: e.g., brief hand lift during breath cycle or momentary frame wobble not affecting core visibility.
level_5: One hand is placed on the lower abdomen with full palm contact, fully visible and unoccluded throughout; side-view framing is rigidly maintained without rotation, zoom, or repositioning; the breathing rhythm is visibly slow and continuous, with the abdominal surface visibly rising and falling in time with each breath; hand placement, contact, and camera framing remain consistent and correctly ordered for the entire sequence.

Scientific and Causal Correctness rubric:
level_1: No physiological correlation between hand placement and breathing; abdominal region shows no displacement; chest rises instead of abdomen; no observable diaphragmatic motion; violates core principle of abdominal breathing.
level_2: Hand contacts abdomen but abdominal region remains static; or chest rises prominently while abdomen is motionless; or abdominal motion occurs asynchronously with breathing (e.g., movement during exhale only); causal link between hand placement and observed motion is broken.
level_3: Abdomen moves during breathing, but motion is ambiguous: may include simultaneous chest rise, or motion originates from waist/hip flexion rather than diaphragm descent; hand placement is anatomically plausible but does not isolate abdominal motion; causal relationship (hand → observe diaphragmatic action) is partially supported but confounded by competing cues.
level_4: Abdominal region expands outward during inhalation and contracts inward during exhalation; chest remains relatively still; hand stays fixed on abdomen and moves *with* the abdominal surface; no contradictory motion (e.g., no rib flare, no shoulder lift); causal chain (hand placement enables observation of diaphragmatic excursion) is visually intact; only one non-core flaw: e.g., slight delay between breath onset and abdominal motion onset, or minimal incidental head movement.
level_5: Abdominal expansion occurs *only* during inhalation and contraction *only* during exhalation; chest and shoulders remain completely motionless; hand maintains full, stable contact and translates precisely with abdominal surface displacement; no extraneous motion; all visual phenomena strictly conform to diaphragmatic breathing physiology: no deviation in timing, location, or direction of motion.

Spatiotemporal Consistency rubric:
level_1: Severe spatiotemporal breakdown: for example, the hand appears already resting on the abdomen in one frame right after being shown away from the body in the previous frame, with no travel motion connecting the two positions; the torso's proportions or the side-view silhouette change abruptly between shots; the camera cuts from a side view to a different angle without any transition; the subject's outline distorts or partly vanishes for part of the sequence; or the lighting on the torso suddenly swings from bright to dark (or the reverse) with no change in the room, camera, or subject to explain it.
level_2: Moderate breakdowns: for example, the hand loses contact with the abdomen for a stretch and reappears in a different spot with no visible sliding or lifting motion connecting the two; the camera viewpoint drifts between side-on, front-on, and back views more than once; the torso appears to bend at an anatomically implausible point; the breathing motion jumps abruptly between inhalation and exhalation with no smooth transition between them; or the shadow cast on the torso flickers or swings to a different direction between frames with no corresponding change in the room's lighting.
level_3: The hand stays on the abdomen and the torso keeps a consistent shape and side-view orientation across the whole sequence, and the camera framing holds steady, but one minor flaw remains, such as a brief moment under a second where the hand is partly hidden behind the arm without actually changing position, or slight camera drift that still preserves the side-view intent.
level_4: All spatial relationships are preserved throughout: the hand stays in the same place relative to the abdomen without sliding or repositioning; the torso's shape, scale, and side-view angle stay consistent from start to finish; the breathing motion is smooth and continuous from frame to frame with no stutter or freeze; only one negligible flaw remains, such as a single frame of slight motion blur that does not obscure the hand or the abdominal contour.
level_5: Everything described for level 4 remains true, and in addition: the hand-to-abdomen contact point is continuously visible and never drifts or breaks contact for the entire sequence; the torso's size, proportions, and the camera's side-view perspective remain constant with no warping or scale change; and the rise-and-fall motion of the abdomen is fluid across the whole duration with no jerk, blur, or discontinuity at any point in the breathing cycle.