Color constancy supports cross-illumination color selection

Supplemental Material


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Individual observer's data: NAU


NOTE: In the illuminant-constant condition of Experiment 2, the coding of competitors used here (online supplement, Experiment 2) is reversed relative to that in Experiment 1: C-1 and C-2 here correspond to C1 and C2 in the bluish illuminant-changed condition, while C1 and C2 correspond to competitors C1 and C2 in the yellowish illuminant-changed condition. That is, to make the data posted here consistent with the conventions in the paper and the appendix the labels for C-1 and C1 should be exchanged, as should the labels for C-2 and C2 (in the illuminant-constant condition only).


The tables below provide individual observer data for the color selection and the color adjustment part of the study, as tab delimited text.
For each part we provide two data files: one for the illumination-constant condition, the other for the illumination-changed conditons (bluish and yellowish illuminant-changed conditions combined).


Color selection task

Selection data for each condition: Illuminant-constant, Illuminant-changed
Data tables for both conditions follow the same format: 
Column 1: Condition code (NC for illuminant-constant; CY and CB for yellowish and bluish illuminant-change, respectively).
Column 2: Block number
Column 3: Trial type (denoted as a unique integer; refers to a specific combination of target, competitor pair and illumination condition)
Column 4: Target (1 for "Gray", 2
for "Rose"; 3 for "Teal" and 4 for "Green")
Column 5: First competitor in the competitor pair on a given trial  (Convention for illumination-constant condition: 1= C-2, 2 =  C-1; 3 = T; 4 = C+1; 5 = C+2; For illumination-changed condition 1= T, 2 = C1; 3 = C2; 4 = C3; 5 = R; 6 = C5; See Figure 2). 
Column 6: Second competitor in the competitor pair on a given trial (same convention as in Column 5).
Column 7: Competitor chosen by the subject on a given trial (1 = the first competitor in a pair, 2 = the second competitor in a pair).
Column 8: Reaction time in seconds (from the trial onset until the subject made a choice).
Column 9: Session order number (tracked separately for illuminant-constant and illuminant-changed conditons).


Figures showing subject's choices and inferred matches (follows the same conventions as Figure 3A):
Illuminant-constant, Illuminant-changed (yellowish), Illuminant-changed (bluish).

Figure showing the relation between measured selection probabilities and those predicted via MLDS procedure (pdf
Different illumination condition is plotted in each row: top - illuminant-constant (NC); middle - illuminant-changed (CY); bottom - illuminant-changed (CB).
Each target is plotted in a different column (marked as T1 to T4). Each subplot follows the same conventions as Figure S2 (supplement).

Figure showing bootstrapped inferred matches
(pdf)
Figure follows the same conventions as Figure A4 in the Appendix. 

Color adjustment task
         
Adjustment data for each condition: Illuminant-constant, Illuminant-changed.

Data tables for both conditions follow the same format: 
Column 1: Condition code (NC for illuminant-constant; CY and CB for yellowish and bluish illuminant-change, respectively).
Column 2: Block number
Column 3: Trial type (denoted as a unique integer; refers to a specific combination of target, competitor pair and illumination condition)
Column 4: Target (1 for "Gray", 2
for "Rose"; 3 for "Teal" and 4 for "Green")
Column 5-7: Subjects' adjustment-based match in XYZ. NaN values denote cases when the subject chose option "match impossible" or pressed pressing match impossible or match complete button inadvertantly; these trials are not included in the analysis.
Column 8: Reaction time in seconds (from the trial onset until the subject pressed match complete / match impossible button).
Column 9: Session order number (tracked separately for illuminant-constant and illuminant-changed conditons).

Figure showing subject's adjustment-based and selection-based matches ploted in CIELAB (pdf)
Different illumination condition is plotted in each row: top - illuminant-constant (NC); middle - illuminant-changed (CY); bottom - illuminant-changed (CB).
Subplots: L vs. a (left), L vs. b (center), a vs. b (right).
Competitor set for each target is plotted in open circles using a matching color (gray, rose, teal, blue); filled circle denotes the tristimulus match.
For each target and condition x symbol indicates mean adjustment-based match (averaged across trials).
Inferred selection-based matches are plotted for reference (open diamonds).