each trial from the list: low, medium and high. Fig. 4 represents the sequence of odor stimuli.
Figure 3. An Experiment set up
A. Selection of Brain Regions
EEG signals are collected from 21 electrodes, which are placed on the scalp of student’s brain. EEG signals are recorded on a separate computer having 8 GB RAM with CPU
Odor 1 (Perfume)
Odor 2 (Dettol)
Odor 3 (Acetic acid)
Odor 4 (Alchohol)
Figure.5. Section of brain region and frequency bands from scalp maps of three concentration level of four stimuli
clock of 3.4 GHz.Fig. 5 shows the scalp maps of one subject. Scalp maps of different concentration level of different stimuli have been recorded during the experiment. From the scalp maps, it can be observed that pre-frontal, Frontal, parietal, and temporal lobes exhibit significant activations during the experiment. Here, the pre-frontal region is hardly activated inolfactory sensing and processing. Besides these, frontal and mainly parietal, temporal are found to take significantly active participation during the experiment. The paper 6 reveals that temporal lobe and frontal lobe are highly associated with human olfactory signal processing. Therefore, weggg select F3, F4, F7, F8 and FZ (for frontal lobe) P3 and P4 (from parietal lobe), T3 and T4(from temporal lobe) and FP1 and FP2 (for prefrontal lobe)for extracting necessary information using signal processing techniques.Fig.6shows the electrode positions over the scalp in our brain during experiment, where the red colored electrodes are used to collect data. Electrodes are placed over the scalp using 10-20 electrode placement system 26.