眼球運動のクロススペクトラム成分による入力操作のユーザビリティ評価の検討

摘要

A possiblity for the usability evaluation using eye-movement behaviors was examined with frequency analysis. An input operational task experiment was conducted using a mouse, a keyboard and a keypad, and the traditional subjective system usability measurements (SU-scores) and error rates were measured. Cross spectrum densities (CSD) between horizontal and vertical eye-movements and coherence as standardized CSD in the first second of the experiment followed the same order of the SU-scores or error rates. Also they significantly correlate with the results of the SU-scores and error rates. To determine the frequency range of CSD and coherence for usability assessment, frequency components used as factors were extracted using factor analysis. According to the correlation coefficients between these and the performance of factor scores for predicting the traditional metrics, factor scores of CSD can be better indices for assessing usability than indices of coherence.%本報告では，入力操作におけるユーザビリティを，眼球運動の周波数解析による評価可能性を検討した.ユーザビリティ評価指標をマウス，キーボード，キーパッドの3種の入力装置で調査し，操作時のユーザの眼球運動について，クロススペクトラム密度，コヒーレンスを算出した.一部の周波数帯域の成分とユーザビリティ指標との間に相関が認められたことから，周波数成分を因子分析し、ユーザビリティ評価に利用可能な周波数成分を検討した.これらの周波数成分によるユーザビリティ指標の予測可能性を検討したところ，クロススペクトラム密度から算出した周波数成分を用いた方が，コヒーレンスの成分を用いる場合よりも性能が高かった.