Table 1.
Characteristics of CRPS patients.
Fig 1.
In video clip 1, a video (without audio) of a young person talking was presented for 7 sec. A total of nine videos of the young person (5 men and 4 women) were presented, and the cross-mark was presented for 3 sec. during each video. In video clip 2, a video (without audio) of Person A touching the hand of Person B was presented for 7 sec. The role of Person A was performed by one man and one woman. A video of Person A touching the right and left hand of Person B was presented 4 times (two times each for man and woman). In addition, cross-marks were presented for 3 sec. during each video. The illustration below shows the AOI for each video clip. AOI: areas of Interest.
Fig 2.
Individual data of visual attentional behavior while watching video clip 1.
FD: fixation duration, FC: fixation count, VP and VNP: VP and VNP refer to the side of the person in video 1 corresponding to the painful and non-painful side of the patients. VR and VL: VR and VL refer to the right and left side of the person in video 1.
Table 2.
Eye movement data of video clip 1.
Fig 3.
Visual attentional behavior to forearm in video clip 1: Comparison of left and right sides or the painful side and the non-painful side.
A) Fixation duration, B) Fixation count. Value: mean and standard deviation. CRPS: complex regional pain syndrome, VP and VNP: VP and VNP refer to the side of the person in video1 corresponding to the painful and non-painful side of the patients. VR and VL: VR and VL refer to the right and left side of the person in video 1.
Fig 4.
Correlation with BPDS and fixation duration.
A-D): video clip 1, E, F): video clip 2. BPDS: Bath CRPS Body Perception Disturbance Scale, VP and VNP: VP and VNP refer to the side of the person in video 1 corresponding to the painful and non-painful side of the patients. VR and VL: VR and VL refer to the right and left side of the person in video 1.
Table 3.
Eye movement data of video clip 2.
Fig 5.
Fixation duration and count while watching video clip 2: Comparison within the touch side or contralateral side.
A) Fixation duration: Comparison of painful and non-painful side hands in CRPS patients, left and right hands in healthy controls. B) Fixation duration: Comparison of left and right hands in CRPS patients and healthy controls. C) Fixation count: Comparison of painful and non-painful side hands in CRPS patients, left and right hands in healthy controls. D) Fixation count: Comparison of left and right hands in CRPS patients and healthy controls. Value: mean and standard deviation. ■: touched side, □: contralateral side. CRPS: complex regional pain syndrome.
Fig 6.
The heat map of eye behavior performed on Case 1, 2 and healthy controls.
A, B) Case 1 (Table 1; No1,), C, D) Case 2 (Table 1; No.4), E, F) Healthy controls. Areas with a higher percentage of gaze have been indicated in red, and areas with a lower percentage have been displayed in green.