I. acid, CH3COOH) and alcohol as stimulus

                                                                                                                                               I.         
Experiments and Results

This section mainly involves in experimental framework and
three following experiments: selection of brain regions, selection of EEG
features, classifier performance.

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A.   
Experimental framework

Our experiment has been done at
Artificial Intelligence Lab, Jadavpur University. We use 21-channel EEG device,
having a sampling rate of 500 Hz and resolution of 100µ in our experiment. Experiment
setup is shown in Figure 3.

 

 

Fig. 3. An Experiment set up

 

Ten healthy volunteers are
participating in above experiments. Out of the 10 healthy volunteer, 4 men and
6 women in the age group 18-32 years are selected. They are requested to sit on
a comfortable chair with back- and elbow-rests in a rest condition without movement
to eliminate possible contamination by movement-related artifacts.Here, in this
experiment we use perfume, dettol,
Vinegar (acetic acid, CH3COOH)
and alcohol as stimulus with three concentration level (low, medium, and
high). The concentration level
should be maintained as Low (25% aroma with 75% water), medium (50% aroma and
50% water) and High (75% aroma and 25% water). All the volunteers are asked to
take the odour samples with three different concentrations (low, medium, high)
respectively with a 20 seconds time gap.To avoid the residual effect of
the previous stimulus, a time-gap of 20 seconds is maintained between two
successive presentations of odor stimuli. Each experiment with one sample
presentation and EEG recordings for one subject together constitutes one trial.
Each trial is repeated 10 times over each subject. All the volunteers are asked to take the odour
samples with three different concentrations (low, medium, high) respectively
with a 20 seconds time gap.To avoid the residual effect of the previous
stimulus, a time-gap of 20 seconds is maintained between two successive
presentations of odor stimuli. Each experiment with one sample presentation and
EEG recordings for one subject together constitutes one trial. Each trial is
repeated 10 times over each subject. In each trial, the sequence of
presentation of the odor concentrations randomly selected from the odor list
depending on the concentration levels: LOW, MEDIUM and HIGH. Fig. 4 represents
the preparation of odor stimuli presented to the subject.