Results of simulation to evaluate how changing default (adult) parameter values associated with no specific hypotheses about Table 7. age-related differences in reading affect six dependent measures diagnostic of children’s eye-movement behavior during reading. Parafoveal Mean Mean Processing Simulated Range of Mean # Mean Saccade Sim. Fixation Probability of Reading Efficiency Results Values Tried Fixations per Length # Duration Making Rate (wpm) (Mean Consistent w/ (Increments) Sentence (characters) (ms) Regression Preview Observations? Benefit; ms) Default (Adult) Parameter Values 7.28 215 6.28 0.04 315 43 N/A 1 50-100 (5) 7.28-7.54 215-228 (+) 6.28-6.27 0.04-0.05 315-289 (+) 43-60 (-) No V 2 1.15-1.3 (0.01) 7.28-8.29 (+) 215-268 (+) 6.28-6.09 0.04-0.07 (+) 315-227 (+) 43-2 (+) ? 3 25-50 (2.5) 7.28-6.23 (-) 215-223 6.28-6.72 0.04 315-373 (-) 43-33 (+) No A 4 0.22-0.38 (0.04) 7.28-7.13 215-216 6.28-6.46 004-0.05 315-320 43-40 No indicates simulated values that are (qualitatively) consistent with children’s data; indicates simulated values that are Note: “+” “–” (qualitatively) inconsistent with children’s data (see Footnote 8).
Table 7. Results of simulation to evaluate how changing default (adult) parameter values associated with no specific hypotheses about age-related differences in reading affect six dependent measures diagnostic of children’s eye-movement behavior during reading. Sim. # Range of Values Tried (Increments) Mean # Fixations per Sentence Mean Fixation Duration (ms) Mean Saccade Length (characters) Mean Probability of Making Regression Reading Rate (wpm) Parafoveal Processing Efficiency (Mean Preview Benefit; ms) Simulated Results Consistent w/ Observations? Default (Adult) Parameter Values 7.28 215 6.28 0.04 315 43 N/A 1 V 50-100 (5) 7.28-7.54 215-228 (+) 6.28-6.27 0.04-0.05 315-289 (+) 43-60 (-) No 2 1.15-1.3 (0.01) 7.28-8.29 (+) 215-268 (+) 6.28-6.09 0.04-0.07 (+) 315-227 (+) 43-2 (+) ? 3 A 25-50 (2.5) 7.28-6.23 (-) 215-223 6.28-6.72 0.04 315-373 (-) 43-33 (+) No 4 0.22-0.38 (0.04) 7.28-7.13 215-216 6.28-6.46 004-0.05 315-320 43-40 No Note: “+” indicates simulated values that are (qualitatively) consistent with children’s data; “–” indicates simulated values that are (qualitatively) inconsistent with children’s data (see Footnote 8).