Table 1.
Linear mixed models fitting log fixation durations for the memorization, preference, and search tasks, fit by restricted maximum likelihood (REML): Means, standard errors, and t values of fixed effects on fixation durations
| Scene-Viewing Task | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Memorization | Preference Judgment | Search | |||||||
| Fixed Effects | b | SE | t | b | SE | t | b | SE | t |
| Intercept of mean fixation duration (log) | 5.534 | 0.034 | 165.02 | 5.549 | 0.039 | 141.8 | 5.437 | 0.032 | 170.37 |
| Local Image Feature Predictors | |||||||||
| Luminance | |||||||||
| Fixation n | –0.014 | 0.004 | –3.71 | –0.015 | 0.004 | –4.04 | –0.023 | 0.006 | –3.57 |
| Fixation n – 1 | 0.004 | 0.004 | 1.09 | –0.003 | 0.004 | –0.72 | –0.002 | 0.005 | –0.46 |
| Fixation n + 1 | –0.006 | 0.004 | –1.49 | –0.008 | 0.004 | –2.06 | –0.004 | 0.005 | –0.8 |
| Luminance contrast | |||||||||
| Fixation n | –0.017 | 0.004 | –4.81 | –0.014 | 0.004 | –3.9 | –0.009 | 0.005 | –1.89 |
| Fixation n – 1 | –0.001 | 0.003 | –0.32 | –0.004 | 0.003 | –1.1 | 0.002 | 0.005 | 0.42 |
| Fixation n + 1 | 0.007 | 0.003 | 2.09 | 0.006 | 0.003 | 1.97 | 0.003 | 0.005 | 0.68 |
| Edge density | |||||||||
| Fixation n | 0.021 | 0.004 | 5.89 | 0.021 | 0.003 | 6.33 | 0.024 | 0.006 | 4 |
| Fixation n – 1 | 0.004 | 0.003 | 1.20 | 0.003 | 0.003 | 1 | 0.003 | 0.006 | 0.46 |
| Fixation n + 1 | –0.005 | 0.004 | –1.4 | 0.003 | 0.003 | 1.05 | –9 × 10–5 | 0.006 | –0.02 |
| Clutter | |||||||||
| Fixation n | 0.021 | 0.005 | 4.40 | 0.02 | 0.005 | 6.06 | 0.031 | 0.007 | 4.4 |
| Fixation n – 1 | –0.009 | 0.005 | –1.88 | –0.001 | 0.004 | –0.28 | 0.001 | 0.006 | 0.09 |
| Fixation n + 1 | –0.008 | 0.005 | –1.74 | –0.002 | 0.004 | –0.37 | –0.005 | 0.007 | –0.75 |
| Number of segments | |||||||||
| Fixation n | 0.023 | 0.004 | 5.79 | 0.022 | 0.004 | 5.77 | 0.020 | 0.005 | 3.77 |
| Fixation n – 1 | 0.004 | 0.003 | 1.01 | –0.002 | 0.003 | –0.62 | –0.004 | 0.005 | –0.76 |
| Fixation n + 1 | –0.003 | 0.004 | –0.74 | –0.006 | 0.003 | –1.76 | –0.004 | 0.005 | –0.82 |
| Oculomotor and Spatiotemporal Predictors | |||||||||
| Previous saccade | 0.028 | 0.004 | 7.06 | 0.036 | 0.003 | 11.55 | 0.068 | 0.004 | 16.09 |
| Previous saccade2 | –0.011 | 0.002 | –7.01 | –0.012 | 0.001 | –8.38 | –0.015 | 0.002 | –7.99 |
| Next saccade | –0.025 | 0.004 | –6.85 | –0.027 | 0.003 | –7.67 | –0.014 | 0.004 | –3.94 |
| ΔAngle | 0.065 | 0.004 | 18.1 | 0.067 | 0.004 | 17.32 | 0.021 | 0.003 | 6.07 |
| Viewing time | 0.04 | 0.003 | 13.44 | 0.045 | 0.004 | 12.41 | 0.058 | 0.004 | 13 |
| Viewing time2 | –0.03 | 0.003 | –10.25 | –0.046 | 0.003 | –14.46 | –0.046 | 0.005 | –9.21 |
| Central distance | 0.004 | 0.003 | 1.64 | 0.002 | 0.003 | 0.71 | –0.002 | 0.004 | –0.38 |
| N of observations | 28,442 | 33,275 | 14,968 | ||||||
| REML criterion | 21,942.6 | 24,593.9 | 11,208 | ||||||
b denotes the estimates of the regression coefficients, SE the standard errors. Nonsignificant coefficients are set in bold (|t| ≤ 1.645). Marginally significant coefficients are set in italics (1.645 < |t| ≤ 1.96)