2. Mental workload
The ratio between a task’s demand and the persons’s capacity
Too high workload leads to stress, reduced performance, errors
Too low workload leads to boredom, efficiency loss
Decrease In alpha associated with increased workload
Increase in theta associated with higher workload
Lower P300 amplitudes in higher workload
RSME scale (Rating scale mental effort) not effortful(2) rather effortful(58) max at 150

3. N-back task Used to measure working memory capacity
Have to say whether item is the same as the one presented n-trials ago.
N=0 – just recognize target (easy)
N=1 – recognize repeats (easy)
N=2 – recognize repeats two back (hard)
3-back Demo here library/experiment_nback.html

5. Alpha, theta and eye movement differences

6. Fz difference

7. FCz difference

8. Pz difference

9. ERP responses

10. ERP responses

11. Accuracy and Bitrate of Classifiers

13. Relative difficulty of the different classification tasks

15. Useful information is in the EEG

16. Concluding thoughts
Workload is not just reflected by the N but by factors related to the subject also
Workload for N=0 or 2 could be distinguished
Workload for N=1 was in between and closer to N=0
Monitoring workload with P300 responses could be quite annoying (and increase workload by their presentation)
Monitoring power in different frequency bands would be less intrusive