Domain: Engineering — Biomedical Engineering
Target concept: EEG (Electroencephalogram)

Video generation prompt: Electrodes for electroencephalogram (EEG) signal acquisition are placed on the frontal region of the subject's head. Two EEG spectral distribution displays are shown side by side, with alpha waves highlighted in green. The left display shows the spectral distribution of alpha and beta waves during the subject's eyes-closed resting state, while the right display shows the spectral distribution of alpha and beta waves during the subject's eyes-open thinking state.

Evaluation guide:
(i) Target concept: State-dependent modulation of frontal EEG spectral power, specifically alpha attenuation and beta enhancement upon eye opening.
Minimum mechanism: Electrodes must be in direct, stable contact with frontal scalp to record neural oscillations; spectral computation must resolve frequency bands with sufficient resolution to distinguish alpha (8–13 Hz) from beta (>13 Hz); green highlighting must be bound to the alpha band to encode its physiological relevance.
(ii)Storyline: Frame 0–2: Subject seated, frontal electrodes clearly visible on forehead. Frame 2–4: Left spectral display fades in, showing dominant green band at 8–13 Hz. Frame 4–6: Right spectral display fades in adjacent to left, showing reduced green band and elevated high-frequency activity. Frame 6–10: Both displays remain stably side-by-side, with green strictly confined to alpha band in each; subject maintains eyes-closed posture (left) and eyes-open posture (right) via persistent visual cues (e.g., eyelid position or text labels); no camera movement, no electrode displacement, no display reflow.

Manual:
Experimental Procedure
1. Place EEG electrodes on subject"s frontal scalp (Fp1/Fp2 locations).
2. Acquire EEG signal during eyes-closed resting state → compute and display spectral distribution (left panel).
3. Acquire EEG signal during eyes-open thinking state → compute and display spectral distribution (right panel).
4. Highlight alpha-band (8–13 Hz) in green on both panels.
Observation of Experimental Phenomena
Left panel: strong green-highlighted peak in 8–13 Hz range; minimal beta activity.
Right panel: attenuated green-highlighted alpha peak; prominent beta activity above 13 Hz.
Summary of Experimental Principles
Frontal EEG electrodes capture cortical signals; alpha waves dominate during relaxed eyes-closed state and suppress during active eyes-open cognition; spectral analysis reveals this state-dependent power redistribution.

Prompt Grounding rubric:
level_1: No frontal electrode placement shown; no side-by-side spectral displays; no alpha waves highlighted in green; no eyes-closed vs. eyes-open state distinction indicated visually.
level_2: At least one frontal electrode is visible on head, OR one spectral display appears, OR green highlighting appears somewhere, but none of the three core prompt elements (frontal electrodes + side-by-side alpha/beta displays + eyes-closed/eyes-open contrast) co-occur in correct configuration.
level_3: Frontal electrodes are placed on subject’s forehead; two spectral distribution displays appear side-by-side; green highlighting is present on at least one display, but either: (a) green is not exclusively or predominantly on alpha-band region, or (b) the left/right labeling or visual cue for eyes-closed vs. eyes-open state is missing or ambiguous.
level_4: Frontal electrodes are placed on subject’s forehead; two spectral displays are shown side-by-side with clear left/right spatial separation; green highlighting appears only on the alpha-band region in both displays; visual labels or unambiguous contextual cues (e.g., “Eyes Closed” text overlay on left, “Eyes Open” on right) indicate the two states, but one non-core flaw exists (e.g., beta band incorrectly labeled, minor misalignment of displays, or transient occlusion of one electrode).
level_5: Frontal electrodes are correctly placed on subject’s forehead (visible as discrete conductive sensors on skin surface); two spectral distribution displays are rigidly side-by-side in the same frame with a fixed viewpoint; green highlighting is applied exclusively and continuously to the labeled alpha-band region in both displays; the left display carries a persistent, unambiguous eyes-closed cue (e.g., an “Eyes Closed” text label and/or the subject's eyes visibly shut) and the right display carries a persistent, unambiguous eyes-open cue (e.g., an “Eyes Open” text label and/or the subject's eyes visibly open); electrodes, both displays, and both state cues remain present and correctly positioned across the entire 10-second duration without interruption, occlusion, or repositioning.

Scientific and Causal Correctness rubric:
level_1: Alpha waves are not highlighted in green; spectral displays show no frequency-domain structure; electrodes are absent or placed outside frontal region; no physiological distinction between eyes-closed and eyes-open states is represented.
level_2: Green highlighting appears, but not aligned with alpha-band region (e.g., appears on delta, theta, or beta bands); OR electrodes appear but are placed on occipital/temporal regions; OR both displays show identical spectral shape and color pattern, with no physiological contrast.
level_3: Frontal electrodes are present; side-by-side spectral displays exist; green highlighting is present in alpha-band region of at least one display, but: (a) alpha power is higher in the right (eyes-open) display, contradicting known physiology; OR (b) beta band is missing or mislabeled in one display; OR (c) green appears in non-alpha regions in either display.
level_4: Frontal electrodes are placed correctly; two spectral displays are side-by-side; green highlighting is confined to alpha-band region in both; left display shows dominant alpha power with low beta power; right display shows attenuated alpha power with elevated beta power, but one non-core violation occurs (e.g., minor spectral smearing, inconsistent baseline, or transient green bleed into adjacent band).
level_5: Frontal electrodes are visibly affixed to frontal scalp; side-by-side spectral displays maintain strict physiological fidelity: left display shows high-amplitude, narrowband green-highlighted activity centered at 8–13 Hz and low beta amplitude; right display shows marked reduction in green-highlighted alpha amplitude and increased broadband beta amplitude; green highlighting remains strictly confined to the 8–13 Hz region in both displays with no spectral leakage, no inversion of alpha/beta dominance, and no temporal misalignment between state label and spectral signature.

Spatiotemporal Consistency rubric:
level_1: Severe breaks in continuity: the subject's head or the frontal electrodes disappear and reappear; an electrode jumps to a visibly different spot on the forehead between shots; either spectral display flickers, jumps to a new position, or rotates; the left and right displays swap sides partway through; the scene cuts or blurs so heavily that electrode placement or display layout can no longer be tracked.
level_2: At least one clear continuity problem is visible: an electrode visibly slides to a different spot on the forehead; one of the two spectral displays wobbles in place or changes size inconsistently between frames; the subject's head rotates more than about 15 degrees, so the frontal electrodes are no longer clearly visible; one display fades out and back in; background elements behind the subject blink or change abruptly.
level_3: The subject's head stays in place, the frontal electrodes stay fixed on the forehead, and both spectral displays stay visible and side-by-side throughout, with no jumps, swaps, or disappearances, but one small flaw is visible, such as a brief, noticeable wobble in one electrode's position or a short partial covering of one display's edge (e.g., by a hand or hair) that clears within the clip.
level_4: The head is fully visible and still; the electrodes hold a fixed, unchanging position on the forehead the whole time; both spectral displays stay visible, the same size, and aligned side-by-side with a consistent left/right layout and gap between them; neither display nor electrode is ever blocked from view, but one very minor imperfection remains, such as a brief glint crossing an electrode's surface or a display border that looks momentarily uneven before settling back into place.
level_5: The electrodes stay visibly fixed at the same spot on the frontal scalp for the entire clip with no drift; the two spectral display panels keep an identical size, shape, spacing, and left/right position relative to each other and to the head throughout; the electrodes and the full area of both displays remain continuously visible and unobstructed from the first frame to the last; any camera or subject motion that does occur looks smooth and physically natural rather than jumpy or discontinuous.