Fig. 5

Summarized results for n = 14 subjects. The results before image normalization are presented on the left (a, c, e, g); the results after image normalization are presented on the right (b, d, f, h). Grey bars indicate eyes closed; for better visualization, these bars are overlaid on all subfigures below. a/b the predetermined eye state as verbally instructed during MRI recording. c/d x/y/z dimensions of the normalized length vector (unity vector with length of 1 voxel) of each bulb. Correlations between the left and right bulb: (before normalization) x-dimension 0.70, y-dimension −0.77, z-dimension 0.82; (after normalization) x-dimension 0.43, y-dimension 0.89, z-dimension 0.81. Correlation with the predetermined eye state: (before normalization) x/left 0.76, x/right 0.82, y/left −0.80, y/right 0.78, z/left 0.79, z/right 0.85; (after normalization) x/left 0.74, x/right 0.50, y/left 0.90, y/right 0.87, z/left 0.82, z/right 0.75. e/f Angle of the length vector in the x- and z-dimension. The angles were calculated in radians. Correlations between the left and right bulb: (before normalization) horizontal 0.77, vertical 0.88; (after normalization) horizontal 0.67, vertical 0.55. Correlations with the predetermined eye state: (before normalization) horizontal left 0.72, right 0.75, vertical left 0.86, right 0.90; (after normalization) horizontal left 0.79, right 0.74, vertical left 0.80, right 0.69. g/h Mean intensity of the segmented eye bulb (low-/high-pass filtered 0.1–0.01 Hz). Correlations between the left and right bulb (before normalization) 0.998; (after normalization) 0.998. Correlations with the predetermined eye state: (before normalization) left 0.947, right 0.946, both eyes 0.947; (after normalization) left 0.950, right 0.951, both eyes 0.951