TABLE 1.
SWIFT parameters for shuffled and normal text reading
Shuffled text | Normal text | t-test (Welch) | |||||||
---|---|---|---|---|---|---|---|---|---|
Parameter | Symbol | Ma | SEa | Ma | SEa | p-value | Rangeb | Equation | |
Lexical parameters | Frequency, intercept | α | 16.8 | 1.3 | 18.7 | 0.97 | .25 | 1–40 | |
Frequency, slope | β | 0.28 | 0.02 | 0.71 | 0.03 | .000 | 0–1 | ||
Predictability | θ | 0 | — | 1.18 | 0.16 | 0–4.6 | |||
Global inhibition | ppf | 24.16 | 2.36 | 0.069 | 0.047 | .000 | 0–30 | ||
Visual processing | Visual span, constant | δ0 | 6.61 | 0.44 | 1.64 | 0.26 | .000 | 0–10 | 1, 4 |
Visual span, dynamic | δ1 | 3.98 | 0.88 | 2.15 | 0.64 | .112 | 0–15 | 1, 4 | |
Visual span, dynamic—additivec | δ1additive | 26.45 | 6.40 | 2.27 | 0.29 | .004 | 3 | ||
Visual span, preprocessing | pspan | 15.0 | — | 15.0 | — | — | — | ||
Word length exponent | η | 0.3 | — | 0.3 | — | — | — | ||
Preprocessing factor | f | 0.609 | 0.068 | 0.814 | 0.059 | .04 | 0.1–1 | ||
Global decay | ω | 0.01 | — | 0.01 | — | — | — | ||
Transfer across saccades | ι | 0.91 | 0.03 | 0.50 | 0.08 | .001 | 0.1–1 | ||
Eye–mind lag | pcd | 30.0 | — | 30.0 | — | — | — | ||
Saccade timing | Random timing (ms) | tsac | 292.5 | 4.6 | 221.2 | 3.8 | .000 | 10–400 | |
Random timing—starting value | tsac0 | 0.8 | — | 0.8 | — | — | — | ||
Inhibition factor | h | 0.085 | 0.056 | 0.549 | 0.160 | .02 | 0–5 | ||
Target selection weight | γ | 1.0 | — | 1.0 | — | — | — | ||
Saccade programs | Labile stage (ms) | τlab | 100.0 | — | 100.0 | — | — | — | |
Refixation factor | refix | 0.7 | — | 0.7 | — | — | — | ||
Mislocated fixation factor | misfac | 0.75 | — | 0.75 | — | — | — | ||
Nonlabile stage (ms) | τ0nl | 50.0 | — | 50.0 | — | — | — | ||
Latency modulation | κ0 | 2.5 | — | 2.5 | — | — | — | ||
Latency modulation | κ1 | 0.3 | — | 0.3 | — | — | — | ||
Saccade execution (ms) | τex | 30.0 | — | 30.0 | — | — | — |
Means and standard errors over 10 independent runs of the genetic algorithm (for each run using the optimal parameter set from the last 500 generations). Other parameters were fixed for previous model versions or for theoretical reasons, and no standard errors are given for these parameters.
Parameter boundaries used in fitting.
Parameter was calculated from fitted values.