A Study Of EEG Changes In The Cerebral Lobes Through Both Scent Stimulation With Cirsium Setidens (Dunn) Nakai Extract And Learning In The Humanities

Abstract

In this study, an EEG waveform analysis was conducted by having the subjects take a humanities course while being exposed to the scent of Cirsium setidens (Dunn) Nakai (also known as Gondre in Korea) extract. To determine the antioxidant effect of Gondre extract, DPPH radical scavenging activity was measured. The activity was found to be 4.52±0.06%, 7.78±0.18%, 12.99±0.12%, 19.98±0.12%, and 32.04±0.11% at 100, 300, 500, 700, and 1000 μL, respectively. To determine the antioxidant effect of Gondre extract, a total flavonoid content (TFC) assay was conducted to measure the TFC. The TFC was found to be 2.74±0.48, 6.96±1.17, 8.74±0.93, 9.46±1.00, and 14.14±1.40 at 10, 30, 50, 70, and 100 μL, respectively. For relative delta waves, the activity in most of the cerebral lobes after humanities learning increased sequentially as the measurement was repeated 4 times. However, at electrode T4, the activity decreased in the 4^th measurement. This may be considered to be caused by increased sound fatigue, but at electrode T3, the activity showed a sequential increase. For relative theta, the activity decreased in the 3^rd and 4^th measurements at electrodes F3, F4, P3, and T4. At electrode Cz, the activity decreased in the 4^th measurement for the group with both scent stimulation and humanities learning (i.e., Group A). In particular, at electrode T3, the activity increased sequentially with repeated measurements, whereas at electrode T4, the activity decreased, like that of relative delta waves. At electrodes F3 and F4, for Group A, relative alpha waves tended to be activated again in the 3^rd and ^4th measurements. At electrodes Cz, P, P, T3, and T4, for Group A, the activity tended to decrease as the measurement was repeated. However, at electrode T4, for Group A, the activity was relatively increased in the 3^rd measurement.