Siyuan Chen
ABSTRACT
The measurement of a user's mental effort is a problem whose solutions may have important applications to adaptive interfaces and interface evaluation. Previous studies have empirically shown links between eye activity and mental effort; however these have usually investigated only one class of eye activity on tasks atypical of HCI. This paper reports on research into eight eye activity based features, spanning eye blink, pupillary response and eye movement information, for real time mental effort measurement. Results from an experiment conducted using a computer-based training system show that the three classes of eye features are capable of discriminating different cognitive load levels. Correlation analysis between various pairs of features suggests that significant improvements in discriminating different effort levels can be made by combining multiple features. This shows an initial step towards a real-time cognitive load measurement system in human-computer interaction.
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Index Terms
- Eye activity as a measure of human mental effort in HCI
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