Domain: Healthcare — Human Physiology
Target concept: Blink reflex induced by a sudden puff of air near the eye

Video generation prompt: A person is facing the camera, with one hand holding a bag and delivering a brief puff of air near one eye from the side.

Evaluation guide:
(i) Target concept: Bilateral (consensual) corneal blink reflex elicited by a non-noxious air-puff stimulus delivered near one eye; because the trigeminal sensory signal is relayed to both facial motor nuclei in the brainstem, both eyes close together even though only one eye receives the stimulus.
Minimum mechanism: Intact trigeminal afferent pathway (V1) on the stimulated side, a bilateral brainstem relay, and an intact facial efferent pathway (CN VII) on both sides; the stimulus must be delivered to the cornea or periocular region of one eye, not a distant site; both eyelids must close, with the stimulated eye's closure occurring no later than the other eye's.
(ii)Storyline: [Phase 1] Person faces camera, both eyes open, hand holding bag at rest beside body. [Phase 2] Hand transports bag laterally into frame adjacent to one eye (same horizontal plane, no vertical offset). [Phase 3] Bag releases a puff (visually indicated by a subtle air disturbance or hand motion cue), immediately followed by rapid, full closure of both eyelids (a consensual blink), with the stimulated eye closing at the same moment as, or a fraction of a second before, the other eye. [Phase 4] Both eyes' eyelids reopen fully within the same sequence. [Visibility constraints] Both eyes must remain fully visible before, during, and after the blink; the bag and hand must not occlude either eye at stimulus onset; the viewpoint must remain fixed and frontal to capture the lateral stimulus delivery on one side and the bilateral (consensual) eyelid response on both sides.

Manual:
Experimental Procedure
1. Person faces the camera directly, stationary.
2. One hand holds a bag at waist or chest level.
3. The hand moves the bag laterally from the side (not the front) toward one eye, delivering a brief puff of air near it.
Observation of Experimental Phenomena
Both eyes exhibit a rapid, complete, involuntary blink: all four eyelids (upper and lower, on both sides) close fully and nearly simultaneously, then reopen together. The eye nearer the puff may close a fraction of a second before the other eye, but the reflex does not produce a lone one-eyed closure while the other eye stays open.
Summary of Experimental Principles
The corneal blink reflex is a protective brainstem-mediated response: mechanical stimulation of the trigeminal nerve (V1 ophthalmic branch) on one side is relayed bilaterally to the facial motor nuclei (CN VII) in the pons, so orbicularis oculi contraction and eyelid closure occur on both sides even though the stimulus itself was delivered to only one eye.

Prompt Grounding rubric:
level_1: The frame does not show a person facing the camera, or no hand or bag is visible, or there's no visible attempt to deliver an air puff near an eye, or no eye is visible at all.
level_2: A person facing the camera is visible along with a hand and a bag, but the bag is not brought to the side of an eye (e.g., it stays at chest level, or approaches the front of the face rather than one side), so the 'puff near one eye from the side' setup is not recognizable.
level_3: A person faces the camera; one hand holds a visible bag; the hand brings the bag to the side of one eye, roughly level with it (not above or below); the targeted eye is unobstructed and visible; the whole scene stays in one continuous, fixed shot.
level_4: The bag is unmistakably held (not floating free or merely near the hand); it sits laterally next to the eye without overlapping or covering it; this hand-bag-eye arrangement holds steady for a clear moment before any puff cue, rather than flashing briefly or drifting in from an odd angle.
level_5: Both eyes remain visible and unobstructed throughout the shot, not just the targeted one; the bag never crops out of frame or gets blocked by the hand; the lateral bag-to-eye spatial relationship set up in the prompt is maintained without the framing shifting, cropping, or losing any of the four elements (person, hand, bag, eye) at any point.

Scientific and Causal Correctness rubric:
level_1: Neither eye blinks in response to the puff (both remain open throughout), or an eye blinks with no temporal relationship to the puff (e.g., a blink occurs well before the hand ever approaches), or the response looks like a slow eye-narrowing or squint rather than a fast full-lid blink.
level_2: One eye blinks after the puff, but the response is clearly a single, isolated wink-like closure with the other eye conspicuously staying wide open the entire time (no partial or delayed closure on that side at all), or the blink happens on the eye far from the puff instead of the near one, or eyelid closure is only partial (the lid doesn't fully cover the eye).
level_3: Following the puff, the eye nearer the air source closes fully; the other eye also shows at least a partial, later closure rather than staying fully open, but the two closures are noticeably out of step (separated by roughly half a second or more), or the far eye's response is much weaker (e.g., only a slight droop) than a comparable full blink.
level_4: Following the puff, both eyes close fully within a fraction of a second of each other (a genuine consensual blink, not one eye alone), and both reopen within the same short window; the stimulated eye may close marginally sooner, but the other eye's closure reads as part of the same reflex event, not a delayed afterthought; no separate squinting, brow movement, or head recoil substitutes for the lid closure.
level_5: The two blinks are essentially simultaneous and matched in speed and completeness (both eyelids reach full closure and reopen together, with no visible lag longer than a single blink's own duration between the two sides); the closure reads unmistakably as one involuntary reflex event affecting both eyes, with no artificial asymmetry such as one eye barely closing.

Spatiotemporal Consistency rubric:
level_1: The person, hand, or bag disappears and reappears, or jumps to a different position between frames; the puff-and-blink sequence is shown from more than one incompatible viewpoint spliced together; the lighting on the face changes abruptly partway through with no visible cause; or the background behind the person flickers, warps, or changes texture with no cause.
level_2: The hand or bag moves with visible jitters or skips rather than a smooth path; the eye's position on the face shifts noticeably between frames as if the head moved without the rest of the body moving; or the shadows on the face change angle partway through even though nothing in the scene indicates a light source moving.
level_3: The person, hand, and bag never jump or reset from one frame to the next: their scale and positioning relative to one another stay consistent as the action plays out; the background behind the person stays put and unchanging; the puff-to-blink motion reads as one continuous action without freezes or skips.
level_4: The hand stays plausibly in contact with the bag as it moves (no gap opening up, and no impossible overlap between the two); the face and both eyes stay rigidly part of the head with no independent sliding or twisting; the lateral bag-to-eye relationship set up early in the clip is preserved in scale and position as the action unfolds, without the bag or eye appearing to grow, shrink, or jump in depth.
level_5: The bag's path toward the eye and away from it reads as one smooth, physically continuous motion, not a straight-line snap into position; the bag never appears to pass through or behind the eye at the wrong moment; no frame shows the image doubling, strobing, or briefly freezing; the fixed camera framing and the lateral spatial relationship between hand, bag, and both eyes hold identically from the first frame to the last.