1. Using Electroencephalography (EEG) for User State / Task Classification in HCI Research Desney Tan Microsoft Research In collaboration with: Johnny Lee (Carnegie Mellon U.) Greg Smith, Ed Cutrell, Mary Czerwinski, Eric Horvitz (Microsoft Research)

2. Approach Use low-cost EEG to classify user state or task If we pick appropriate states/tasks, we can… –Control computers with thought alone –Evaluate systems and interfaces –Build intelligent adaptive systems Measure EEG signal (labeled with states of interest) Generate and select relevant features Build Model (Bayes Net) Classify new (unlabeled) Data

3. Experiment 1 Cognitive tasks in controlled environment –Rest v. Mental math v. Mental object rotation –84% accuracy! Random classifier (or human)

4. Experiment 2 Halo task in ‘real-world’ environment –Rest v. Play alone v. Play against enemy –92% accuracy

5. Contributions and Future Work Low-cost system can be used Works in ‘real world’ computing environment –Rather than preventing/filtering, let machine treat ‘noise’ as ‘signal’ where appropriate Characterize states/tasks we can measure Figure out how to generalize models Apply to evaluation or adaptive systems