what is the difference between a fixed effect and a random effect can you use pupil size in a linear mixed effect linear regression analysis what is the variable for pupil size which variable is used for calculating residual variable saliency? how do you find out what pupil size is the predictor of saliency can pupil size predict saliency what is the correlation between pupil size and saliency in mixed effects can you use pupil size in mixed effect is pupil size a fixed or random effect how to find pupil size in mixed effects why is pupil size important for saliency what is the lmer of a pupil can you predict pupil size how do fixed effects of pupil size correlate? why is pupil size a fixed effect what is the lmer function in r which predictor of visual saliency is the most likely to correlate with pupil size? what variable in mixed effect reflects the saliency of the visual stimulus? what model is used to find pupil size what predicts saliency on images?