7.1.3 Experiment Three A: Visual Counting Task - Eyes Open
It was decided to try another mental task: visual counting, which have been used
successfully in, for instance, a study by Keirn and Aunon (1990). This also matches
the functionality of the frontal lobe, as it is related to mathematics and problem
solving. 1 scenario consisted of two parts: in the first part, 20 baseline samples
was recorded. In the second part, 20 visual counting samples was recorder. Eyes
were open during the entire scenario. The 20 samples from each part was used
to generate 1 training set per feature, averaged and scaled to 1, like discussed in
section 6.3.2.
7.1.4 Experiment Three B: Visual Counting Task - Eyes Closed
Experiment 3A gave results, but they were not satisfying. This led to a variant
where the baseline part of a scenario was conducted with eyes closed, in an attempt
to increase the difference in band powers. This should work because if one assumes
that when closing your eyes, the perception process is halted in the brain since
there are no visual input anymore. Regardless, in a study by L. Zhang et al. (2005)
it was recorded a major alpha waves increase in 20 EEG subjects, when their eyes
were closed vs. when their eyes were open.