The three experiments in this dataset showed that mean fixation duration increased across repetitive displays of the same images. This effect vanished when the set of images changed between blocks, indicating that the increase in the mean fixation duration can be attributed to familiarity. We report a reanalysis of the same data by fitting an ex-Gaussian distribution for each participant in each block. For each parameter, we conducted a one-way ANOVA with block as the within-subject factor. Similar to the original work, in the second and third experiments, which included a set of novel images in each block, we conducted an additional one-way ANOVA for novel images. As displayed in
Figure 4, all experiments showed a stable increase across blocks in the τ parameter when viewing the same images, experiment 1: F(2, 58) = 6.305,
p = 0.003, R
2 = 0.02; experiment 2: F(2, 68) = 15.032,
p < 0.0001, R
2 = 0.062; experiment 3: F(2, 60) = 5.038,
p = 0.009, R
2 = 0.031. However, no consistent modulation of the μ parameter, experiment 1: F(2, 58) = 0.126,
p = 0.882, R
2 = 0.001; experiment 2: F(2, 68) = 7.711,
p = 0.001, R
2 = 0.051; experiment 3: F(2, 60) = 0.248,
p = 0.781, R
2 = 0.003, or σ parameter, experiment 1: F(2, 58) = 0.246,
p = 0.115, R
2 = 0.017; experiment 2: F(2, 68) = 1.698,
p = 0.191, R
2 = 0.018; experiment 3: F(2, 60) = 0.395,
p = 0.675, R
2 = 0.005, was observed. Specifically, whereas in the first and third experiments the μ values increased slightly across blocks, in the second experiment they actually decreased. When observing the novel images, a significant increase in σ values was only found in the second experiment, experiment 2: F(2, 68) = 6.829,
p = 0.002, R
2 = 0.06; experiment 3: F(2, 60) = 0.691,
p = 0.505, R
2 = 0.007. Importantly, no effect of τ was observed when the images were novel, experiment 2: F(2 ,68) = 0.026,
p = 0.974, R
2 = 0; experiment 3: F(2, 60) = 0.211,
p = 0.81, R
2 = 0.001.