Shih-Chiung Lai

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Information entropy and mutual information were investigated in discrete movement aiming tasks over a wide range of spatial (20-160 mm) and temporal (250-1250 ms) constraints. Information entropy was calculated using two distinct analyses: (1) with no assumption on the nature of the data distribution; and (2) assuming the data have a normal distribution.(More)
To obtain insight to the massive data that modern MRI technology provides, neurosurgeons and research scientists require an integrated system that reads multiple modalities of data, visualizes the information in an intuitive fashion, and offers instant user feedback. Similar systems have been designed and used in practice but require large-scale(More)
Mutual information between diffusion-weighted and T2-weighted images, used for eddy-current distortion correction in diffusion tensor imaging, is generally estimated using linear interpolation and partial volume methods. These methods compromise the values of the mutual information, thus providing reduced accuracy in eddy-current distortion correction(More)
The authors investigated the effects of movement time and movement distance on the information entropy and variability of spatial and temporal error in a discrete aiming movement. In Experiment 1, the authors held movement distance (100 mm) constant and manipulated 11 movement times (300-800 ms) of 8 participants. In Experiment 2, the authors tested 6(More)
PURPOSE We prospectively designed a Taiwan cancer-related fatigue cognition questionnaire, version 1.0 (TCRFCQ-V1.0), for Taiwanese patients with cancer and investigated the reliability and validity of this questionnaire. RESULTS The completion rate of the TCRFCQ-V1.0 was high (97% of the patients completed all items), and the rate of missing data was low(More)
This study investigated the mutual information in the trajectories of discrete aiming movements on a computer controlled graphics tablet where movement time ( 300 - 2050 ms) was manipulated in a given distance (100 mm) and movement distance (15-240 mm) in 2 given movement times (300 ms and 800 ms ). For the distance-fixed conditions, there was higher mutual(More)
Information entropy of the joint spatial and temporal (space-time) probability of discrete movement outcome was investigated in two experiments as a function of different movement strategies (space-time, space, and time instructional emphases), task goals (point-aiming and target-aiming) and movement speed-accuracy constraints. The variance of the movement(More)
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