Analysis using codes: example 2

Using iMap4, we created the single-trial 2D fixation duration map and smoothed at 1° of visual angle. Importantly, to keep in line with Miellet, et al (2012), spatial normalization was performed by Z-scoring the fixation map across all pixels independently for each trial (the result is identical without spatial normalization in this example). We also applied a mask generated with the default option. No down sampling was performed. We then applied a full model on the single-trial fixation duration map made used of the “single-trial” option in iMap4:

Pixel_Intensity ~ Observer culture + Blindspot size + Observer culture * Blindspot size + (1 | subject)      

Only the predictor of subject was treated as random effects and the model was fitted with maximum likelihood estimation (ML).