Domain: Healthcare — Anthropotomy
Target concept: The Physiological Curves and Structure of the Spine

Video generation prompt: A set of adult spinal specimens is placed on the table in a natural posture, and their curvature, vertebral alignment, and spinous process distribution are observed.

Evaluation guide:
(i) Target concept: Visual verification of physiological spinal curvatures and anatomical landmarks in natural posture.
Minimum mechanism: Specimen must be a real or anatomically accurate replica of an adult human vertebral column, mounted statically on a rigid horizontal surface under stable illumination, viewed from a fixed axis to preserve spatial relationships and avoid foreshortening distortion.
(ii)Storyline: [0s] Table surface enters frame; [1s] Adult spinal specimen(s) placed centrally in natural upright posture; [2–9s] Continuous static shot maintaining full visibility of entire specimen length; [10s] Final frame holds: curvature contour, vertebral alignment continuity, and spinous process distribution all simultaneously and unambiguously visible. No action beyond placement occurs; all observation is passive and visual. Viewpoint must be lateral (side-on), the only angle that reveals the spine's natural front-to-back curves, with enough postero-lateral tilt allowed to keep the spinous processes visible in profile; no strict frontal-only shot (which would hide the curves), no panning, no tracking motion. Visibility constraints: no occlusion, no glare, no depth-of-field blur affecting anatomical features.

Manual:
Experimental Procedure
1. Place one or more adult dried spinal specimens on a flat table in natural upright posture.
2. Position camera in a fixed lateral (side-on) or postero-lateral oblique view to keep the specimen's natural front-to-back curve in profile across its full length.
3. Observe curvature, vertebral alignment, and spinous process distribution.
Observation of Experimental Phenomena
- Three physiological curves visible in profile: cervical lordosis (curving forward), thoracic kyphosis (curving backward), lumbar lordosis (curving forward)
- Vertebral bodies aligned in smooth continuity, no step-offs or gaps
- Spinous processes visible projecting posteriorly, evenly spaced and alternating in prominence, increasing from T1 toward C7
Summary of Experimental Principles
The adult spine exhibits four physiological curvatures in the sagittal plane: primary curves (thoracic and sacral kyphoses) retained from fetal position, and secondary curves (cervical and lumbar lordoses) developed postnatally with head lifting and walking. Natural posture preserves these curves, enabling optimal load distribution and shock absorption. Spinous process orientation and spacing reflect underlying vertebral morphology and regional biomechanics.

Prompt Grounding rubric:
level_1: No adult spinal specimen is present on the table; or the specimen is bent, twisted, or suspended rather than in a natural standing posture; or the camera view hides the front-to-back curve entirely (e.g., a straight-on frontal shot with no lateral component), so no curvature, vertebral alignment, or spinous-process spacing can be seen at all.
level_2: A spinal specimen sits on the table, but the posture is off (visible sideways lean of more than about 15 degrees, rotation, or a flattened rather than curved profile); or the camera angle only shows one of the three target features (curvature, vertebral alignment, or spinous-process spacing) instead of all three; or part of the specimen is cropped out or blocked from view.
level_3: One or more spinal specimens rest on the table in an upright, balanced posture with no forced bending, twisting, or rotation; the camera holds a lateral or postero-lateral view that lets the cervical, thoracic, and lumbar curves, the smooth run of vertebral bodies, and the spacing of the spinous processes in profile all be seen together.
level_4: Everything required for score 3 holds, and additionally at least two specimens sit side by side on the table in the same posture and camera framing; all three target features remain visible across every specimen shown; nothing else (labels, gloves, tools) blocks the view of the spine.
level_5: Everything required for score 4 holds, and additionally the spinous processes form an evenly spaced row projecting backward with no obvious gaps or pile-ups; the vertebral column reads as one smooth curve from neck to lower back with no visible kinks or step-offs; the shot holds steady with no blur or added perspective distortion, keeping every feature visible for the whole clip.

Scientific and Causal Correctness rubric:
level_1: The specimen's profile shows an anatomically impossible shape: perfectly straight, curved the wrong way (a single C rather than an alternating S), or with no distinction between neck, mid-back, and lower-back regions; or the spinous processes are missing entirely or point in random directions; or the vertebral column shows an obvious step or dislocation.
level_2: Vertebral segments are recognizable but at least two of the three natural curves (neck curving forward, mid-back curving backward, lower back curving forward) are missing or flattened; or the spinous processes are visible but don't follow a regular spacing pattern; or the column shows a visible sideways kink or twist rather than a smooth front-to-back S shape.
level_3: All three natural curves are visible as smooth, regionally distinct bends: the neck curving one way, the mid-back curving the other way, the lower back curving back the first way; the vertebral column runs as one continuous line with no gaps or steps; the spinous processes project backward in a regular, rhythmic sequence along the column.
level_4: Everything required for score 3 holds, and additionally the curve transitions happen at plausible regional boundaries rather than mid-vertebra; the spinous processes look longer and more angled in the mid-back region and shorter in the lower back, with the neck's lowest process visibly more prominent than the ones above it; nothing looks pathological (no wedge-shaped vertebra, no sharp angular kink, no visible gap between vertebrae).
level_5: Everything required for score 4 holds, and additionally the neck curve and lower-back curve bow the same direction while the mid-back curve bows the opposite way, matching how a real spine reads in profile; the spinous processes keep a steady front-to-back spacing rhythm with no vertebra skipped or doubled; every vertebral body looks a similar height front-to-back with no visible wedging; the overall shape makes clear that natural upright posture is producing these curves and this spinous-process rhythm.

Spatiotemporal Consistency rubric:
level_1: The specimen suddenly appears, disappears, or jumps to a new position or angle; it bends, splits, or stretches in a way no rigid bone structure could; the room lighting cuts out or flashes without cause; the table itself seems to crack or warp; the camera cuts to a different angle mid-clip.
level_2: A spinous process or section of the vertebral column appears to shift position slightly between moments even though nothing touched it; a bright reflection on a bony surface jumps to a new spot with no corresponding light change; the table's surface texture or reflection looks inconsistent from one moment to the next; the camera drifts sideways or up-down instead of holding its position.
level_3: The specimen stays in the same spot and posture on the table for the whole clip; nothing about it appears, disappears, or breaks apart; shadows stay attached to the specimen and match a single, unmoving light source; the table looks rigid and flat throughout; the camera keeps the same lateral or postero-lateral framing without cutting to a new angle.
level_4: Everything required for score 3 holds, and additionally no blur smears the spinous processes or the curve of the vertebral column; if more than one specimen is shown, their relative sizes and spacing stay consistent rather than shifting with false depth; no warping bends the curve line or squeezes the spinous-process spacing; the footage never stutters or repeats a frame in a way that breaks the sense of stillness.
level_5: Everything required for score 4 holds, and additionally the specimen shows no visible trembling or vibration for the entire clip; the shadows cast by the spinous processes stay locked to their bases the whole time; the table's surface looks evenly lit with no odd bright or dark patches; the camera holds fully still (no pan, tilt, zoom, or refocusing) for the full duration.