## 4 Discussion
\begin{table}
\begin{tabular}{l c c c c c c c c} \hline \hline \multirow{2}{*}{**Tasks**} & \multirow{2}{*}{**Cut-Off**} & \multicolumn{3}{c}{**Predictive Measures**} & \multicolumn{3}{c}{**Youden’s**} & \multicolumn{3}{c}{**Goodness-of-Fit**} \\ \cline{2-10}  & & **Value** & **Accuracy** & **Specificity** & **Sensitivity** & **AUC** & **Index** & **AIC** & **R\({}^{2}\)** & **_p_** \\ \hline (A) Finger mass flexion & 0.407 & 0.938 & 1.000 & 0.929 & 0.964 & 0.929 & 11.6 & 0.683 & \(<\)0.001 \\ (B) Finger mass extension & 0.524 & 0.969 & 1.000 & 0.963 & 0.981 & 0.963 & 9.41 & 0.805 & \(<\)0.001 \\ (C) Thumb radial abduction & 0.299 & 0.938 & 1.000 & 0.920 & 0.960 & 0.920 & 13.5 & 0.716 & \(<\)0.001 \\ (D) Thumb-index finger pinch & 0.336 & 0.719 & 0.750 & 0.958 & 0.828 & 0.708 & 26.1 & 0.387 & \(<\)0.001 \\ (E) Cylindrical grasp & 0.913 & 0.844 & 1.000 & 0.846 & 0.942 & 0.846 & 19.6 & 0.495 & \(<\)0.001 \\ (F) Spherical grasp & 0.983 & 0.844 & 1.000 & 0.833 & 0.906 & 0.833 & 25.2 & 0.410 & 0.005 \\ (G) Index-middle finger flexion & 0.005 & 0.719 & 0.900 & 0.636 & 0.764 & 0.536 & 35.7 & 0.202 & 0.021 \\ (H) Thumb-index finger extension & 0.363 & 0.813 & 0.727 & 0.952 & 0.814 & 0.680 & 29.1 & 0.391 & \(<\)0.001 \\ (I) Finger mass & 0.570 & 0.813 & 0.750 & 0.900 & 0.821 & 0.650 & 32.9 & 0.318 & 0.003 \\ abduction/adduction & & & & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Accuracy for cut-off values of nine tasks recorded with _Falrenheit_. -ulnar ring and little fingers. This would influence the functional restriction of the anatomy of the flexor digitorum profondus muscle (FDP) and common digital extensor muscle (CDE). The FDP, which is a protagonist muscle during flexing of the DIP joints, originates radially from the palmar side of the interosseous membrane. The ulnar portion of FDP originates from the ulnar and palmar sides. The radial portion forms the FDP tendon of the index finger, whereas the ulnar portion first forms one tendon and then divides into three tendons after reaching the distal end of the forearm. Then, each forms the FDP tendons of the middle, ring, and little fingers, which are jointed into the distal phalanges. Thus, in the middle, ring, and little fingers, if a DIP joint of the adjacent fingers is extended, the contraction of the muscle originating from the ulnar portion is restricted; thus, it is difficult or impossible to achieve the DIP flexion angle of the middle finger during the index-middle finger flexion task. The CDE is an extrinsic finger extensor muscle, which is located in the posterior forearm, and gradually transitions into four tendons attached to the dorsal side of the middle and distal phalanges of the four fingers (from index to little fingers). These CDE tendons do not remain fully separated from one another and have an intertendinous connection. As a result, the extension of one finger can be influenced by the position of the other fingers. Thus, in this position, it is difficult or impossible to extend the ring finger at the MCP joints during this task. Therefore, it is necessary to develop a system in the future that can be used in accordance with individual differences in the FDP and CDE. This study has several limitations. First, _[PERSON]_ cannot measure muscle contractions that occur in the absence of joint articulation, as it can only detect changes in the joint angles of the virtual hand derived from the recordings of the two IR cameras. Thus, _Falrenheit_ cannot detect changes during a transitional period, such as the transition between flacid paralysis in BRS stage I to voluntary slight mass grasp in BRS stage II. Second, a selection bias could have limited the results of this study because the subjects of this study were patients with CeVD in the acute phase. It is unclear whether _Falrenheit_ can be used to evaluate hand motor function in patients with hemiparesis following CeVD in the chronic phase. In this study, we could not collect data on the muscle strength, tone, and somatosensory function that affect finger paralysis.