{"schema_version":1,"status":"Shared source scenes reviewed; 38 unique lossless videos, 20 pair mappings; numeric and keyframe QA passed","config":{"width":768,"height":512,"fps":24,"frames":72,"duration_s":3,"processor_input":"unmeasured"},"tasks":{"T2":{"title":"Brightness increment","question":"Which side brightened briefly? LEFT or RIGHT.","classic_label":"Disk · matched area and measured ΔY","parameters":{"scene_gain":{"levels":[0.25,0.5,0.9],"default":0.9,"label":"Scene baseline gain (linear RGB)"},"delta_Y":{"levels":[0.005,0.015,0.025,0.04,0.09],"default":0.025,"label":"Linear digital ΔY"},"label":{"levels":["LEFT","RIGHT"],"default":"LEFT","label":"Brightening side"},"background_layout":{"levels":["scene","matched"],"default":"scene","label":"Background layout"},"background_view":{"levels":["scene","placement"],"default":"scene","label":"Background source view"},"background_flip":{"levels":["original","horizontal"],"default":"original","label":"Background orientation"}},"formula":["B = scene_gain × linearRGB(composited scene and foreground); B_event = B + alpha_object × ΔY × (1,1,1). Gain changes the baseline, while ΔY remains an independent additive increment.","A complete natural background is the default, with two persistent identical foreground objects positioned in clear regions. An optional matched control copies one patch into two identical comparison fields without mirroring. One object brightens at frames 24–27. Scene gains .25/.5/.9 are programmatic darkening levels, not night sources or physical luminance. The classic disk matches alpha area and decoded core mean increment. This asks which side changed, not which is finally brighter."," Full source scene is shared with T1/T4. Background-only mirror is an independent optional control; foreground identity, angle and label stay fixed. Local background luminance mean/RMS are recorded. Counterbalance answers within each source; source count alone does not remove context effects."],"protocol":"A complete natural background is the default, with two persistent identical foreground objects positioned in clear regions. An optional matched control copies one patch into two identical comparison fields without mirroring. One object brightens at frames 24–27. Scene gains .25/.5/.9 are programmatic darkening levels, not night sources or physical luminance. The classic disk matches alpha area and decoded core mean increment. This asks which side changed, not which is finally brighter. Full source scene is shared with T1/T4. Background-only mirror is an independent optional control; foreground identity, angle and label stay fixed. Local background luminance mean/RMS are recorded. Counterbalance answers within each source; source count alone does not remove context effects.","human":"Blackwell-style increment detection motivates the manipulation. Digital Y and the current two-location video are new; historical thresholds remain a neighboring panel, not overlaid accuracy.","matching":["event onset and duration","left/right location","alpha area","decoded core mean ΔY"],"not_matched":["ROI shape","natural texture and scene semantics","physical luminance and visual degrees"],"canvas_px":[768,512],"human_comparison":"Blackwell-style increment detection motivates the manipulation. Digital Y and the current two-location video are new; historical thresholds remain a neighboring panel, not overlaid accuracy."},"T3":{"title":"Orientation discrimination","question":"Which object’s specified straight axis is closer to vertical? LEFT or RIGHT.","classic_label":"Bar · matched axis angle","parameters":{"tilt_deg":{"levels":[1,2,4,8,16,45,90],"default":8,"label":"Foil tilt (degrees)","primary_levels":[1,2,4,8,16],"extended_levels":[45,90]},"label":{"levels":["LEFT","RIGHT"],"default":"LEFT","label":"Vertical side"},"sign":{"levels":[-1,1],"default":1,"label":"Foil lean sign"},"background_layout":{"levels":["scene","matched"],"default":"scene","label":"Background layout"},"background_view":{"levels":["scene","placement"],"default":"scene","label":"Background source view"},"background_flip":{"levels":["original","horizontal"],"default":"original","label":"Background orientation"}},"formula":["Clockwise canonical rotation = canonical_rotation_deg when specified, otherwise annotated axis_deg. Then rotate by −requested axis_deg. One undirected physical axis = 0°; the foil = sign × tilt. One fixed object scale is retained. Scissors canonical 0° has blade up and handles down.","A reselected complete background with clear placement regions is the default. Only the complete foreground object rotates, at fixed scale; the background stays fixed across label flips. Optional matched layout duplicates one patch into left/right comparison fields without mirroring. Exposure frames 24–35 = 500 ms. Bar is a classical orientation control. 45°/90° are optional endpoint checks."," Full source scene is shared with T1/T4. Background-only mirror is an independent optional control; foreground identity, angle and label stay fixed. Local background luminance mean/RMS are recorded. Counterbalance answers within each source; source count alone does not remove context effects."],"protocol":"A reselected complete background with clear placement regions is the default. Only the complete foreground object rotates, at fixed scale; the background stays fixed across label flips. Optional matched layout duplicates one patch into left/right comparison fields without mirroring. Exposure frames 24–35 = 500 ms. Bar is a classical orientation control. 45°/90° are optional endpoint checks. Full source scene is shared with T1/T4. Background-only mirror is an independent optional control; foreground identity, angle and label stay fixed. Local background luminance mean/RMS are recorded. Counterbalance answers within each source; source count alone does not remove context effects.","human":"The historical reference-orientation→JND task differs from our distance-from-vertical→accuracy. Keep adjacent panels; a wider angle range does not make the measures equivalent.","matching":["axis angles","exposure and onset","center locations"],"not_matched":["object outline","classic bar width and natural shape","historical JND readout"],"canvas_px":[768,512],"human_comparison":"The historical reference-orientation→JND task differs from our distance-from-vertical→accuracy. Keep adjacent panels; a wider angle range does not make the measures equivalent."},"T4":{"title":"Global motion","question":"What is the overall horizontal movement relative to the stationary background? LEFT or RIGHT.","classic_label":"Dots · matched centers, speed and alpha area","parameters":{"N":{"levels":[5,10,15,20],"default":10,"label":"Object count"},"coherence":{"levels":[0,0.2,0.4,0.6,0.8,1],"default":0.6,"label":"Signal fraction"},"size":{"levels":[48,64],"default":48,"label":"Object fitting size (px)"},"direction":{"levels":["LEFT","RIGHT"],"default":"RIGHT","label":"Signal direction"},"seed":{"levels":[0,1],"default":0,"label":"Trajectory seed"}},"valid_sizes_by_N":{"5":[48,64],"10":[48,64],"15":[48,64],"20":[48]},"formula":["k = round(N × coherence); actual coherence = k/N. Signal velocities = (±16,0) px/s; noise directions are balanced around the circle. Object identities remain fixed throughout the clip.","512×512 is the digital stimulus canvas. Default review uses 10 objects drawn from orange, apple, and mug identities; thin spoons are not in the default set. Balanced identity counts are shuffled with a separate RNG stream independently of signal selection, and stay fixed within the clip and across direction flips. Classic circles match centers, trajectories, and alpha area. Zero-signal controls have no directional answer. Unsupported size/count combinations are explicit, never silently reduced."],"protocol":"512×512 is the digital stimulus canvas. Default review uses 10 objects drawn from orange, apple, and mug identities; thin spoons are not in the default set. Balanced identity counts are shuffled with a separate RNG stream independently of signal selection, and stay fixed within the clip and across direction flips. Classic circles match centers, trajectories, and alpha area. Zero-signal controls have no directional answer. Unsupported size/count combinations are explicit, never silently reduced.","human":"Random-dot motion is the historical anchor. Our small-N, large-object dot control is adapted for natural visibility, not an exact classic human reproduction.","matching":["centers and trajectories","speed","N and signal count","alpha area"],"not_matched":["object appearance and outline","natural texture and shape spectra","human display geometry"],"canvas_px":[512,512],"human_comparison":"Random-dot motion is the historical anchor. Our small-N, large-object dot control is adapted for natural visibility, not an exact classic human reproduction."},"T5":{"title":"Brief targets and masking","question":"Did the shown target orientation appear at either event? PRESENT or ABSENT.","classic_label":"Upright L · rotated-L foils","parameters":{"soa":{"levels":[4,12,24],"default":12,"label":"SOA (frames at 24 fps)"},"size":{"levels":[128,160],"default":160,"label":"Target maximum extent (px)"},"scenario":{"levels":["PRESENT_FIRST","PRESENT_SECOND","ABSENT_A","ABSENT_B"],"default":"PRESENT_SECOND","label":"Target schedule"},"position":{"levels":[0,1],"default":0,"label":"First event: left/right"},"background_view":{"levels":["scene","placement"],"default":"scene","label":"Background source view"},"background_flip":{"levels":["original","horizontal"],"default":"original","label":"Background orientation"},"second_position":{"levels":["TOP","BOTTOM"],"default":"TOP","label":"Second event position"},"foil_variant":{"levels":[0,1,2],"default":0,"label":"Foil rotation pair"},"mask_seed":{"levels":[0,1],"default":0,"label":"Mask seed"}},"formula":["S1 onset = frame 18; S2 onset = 18 + SOA. Each target lasts 2 frames (83.33 ms). Each opaque mask begins immediately after its target and persists to frame 71.","Original cross layout restored: S1 left/right (194/574,256); S2 top/bottom (384,111/401). Four location boxes and central fixation remain visible. Upright L is the classic target; 90°/180°/270° rotations are foils. Natural canonical orientation is shown separately as a reference. Readout is any-event target presence."," Full source scene is shared with T1/T4. Background-only mirror is an independent optional control; foreground identity, angle and label stay fixed. Local background luminance mean/RMS are recorded. Counterbalance answers within each source; source count alone does not remove context effects.","Original cross layout restored: S1 left/right (194/574,256); S2 top/bottom (384,111/401). Four location boxes and central fixation remain visible. Upright L is the classic target; 90°/180°/270° rotations are foils. Natural canonical orientation is shown separately as a reference. Readout is any-event target presence. Full source scene is shared with T1/T4. Background-only mirror is an independent optional control; foreground identity, angle and label stay fixed. Local background luminance mean/RMS are recorded. Counterbalance answers within each source; source count alone does not remove context effects. Paired schedule: foil pairs (90,180), (180,270), (270,90). PRESENT_FIRST/SECOND versus ABSENT_A changes exactly one event to 0 degrees. ABSENT_B exchanges the two foils. Event positions, other event, mask pixels, timing and target scale stay fixed in the paired comparison. Outlined location guides remain visible on light backgrounds."],"protocol":"Original cross layout restored: S1 left/right (194/574,256); S2 top/bottom (384,111/401). Four location boxes and central fixation remain visible. Upright L is the classic target; 90°/180°/270° rotations are foils. Natural canonical orientation is shown separately as a reference. Readout is any-event target presence. Full source scene is shared with T1/T4. Background-only mirror is an independent optional control; foreground identity, angle and label stay fixed. Local background luminance mean/RMS are recorded. Counterbalance answers within each source; source count alone does not remove context effects. Paired schedule: foil pairs (90,180), (180,270), (270,90). PRESENT_FIRST/SECOND versus ABSENT_A changes exactly one event to 0 degrees. ABSENT_B exchanges the two foils. Event positions, other event, mask pixels, timing and target scale stay fixed in the paired comparison. Outlined location guides remain visible on light backgrounds.","human":"PsyToolkit ab (close to Duncan, Ward & Shapiro 1994 Experiment 2) uses a 50 ms stimulus. Our 24 fps / 83.33 ms target is a digital adaptation; no direct human accuracy overlay. https://www.psytoolkit.org/experiment-library/ab.html","source":{"url":"https://www.psytoolkit.org/experiment-library/ab.html","paper":"https://doi.org/10.1038/369313a0","lines":"344–361; stimulus and masking sequence at 355–361","retained":"S1 horizontal position; S2 vertical position; four boxes and fixation; upright L vs rotated L; persistent masks; any-event present/absent","adapted":"800×600 source geometry becomes 768×512; official 50 ms targets become two 24-fps frames (83.33 ms); onset=.75 s; finite 3 s review clip"},"matching":["two-event positions","target schedule and label","target duration and mask persistence","mask pixels and extent"],"not_matched":["letter and object alpha shape","historical 50 ms display timing","historical attentional-dwell task conditions"],"canvas_px":[768,512],"human_comparison":"PsyToolkit ab (close to Duncan, Ward & Shapiro 1994 Experiment 2) uses a 50 ms stimulus. Our 24 fps / 83.33 ms target is a digital adaptation; no direct human accuracy overlay. https://www.psytoolkit.org/experiment-library/ab.html","paired_event_schedule":true,"outlined_guides":true}},"pairs":[{"id":"shared_t2_street_left","task":"T2","combo":{"task":"T2","background_id":"gpt_bg_093","object_ids":["photo_obj_043"]},"params":{"scene_gain":0.5,"delta_Y":0.005,"label":"LEFT","background_layout":"scene","background_view":"scene","background_flip":"original"},"details":{"task":"T2","background":"gpt_bg_093","objects":["photo_obj_043"],"encoding_px":[768,512],"processor_input":"unmeasured","background_transform":{"source":[1536,1024],"crop_xywh":[0,0,1536,1024],"output":[768,512],"resize":"isotropic center crop; 2×2 linear-RGB area samples; no stretching","source_view":"full scene"},"parameters":{"scene_gain":0.5,"delta_Y":0.005,"label":"LEFT","background_layout":"scene","background_view":"scene","background_flip":"original"},"background_context":{"left":{"center_px":[192,256],"roi_xywh":[0,0,384,512],"mean_Y":0.3359122680751096,"RMS_Y":0.23147209685212083,"pixels":196608},"right":{"center_px":[576,256],"roi_xywh":[384,0,384,512],"mean_Y":0.13386110234613327,"RMS_Y":0.12193973551108077,"pixels":196608},"definition":"Linear digital luminance mean and RMS of the prepared background before foreground compositing; local contexts are not automatically equalized."},"working_alpha_policy":"Source RGBA unchanged; discard alpha <= 7/255 before crop and linear-RGB area resampling. 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