The pleasant odor reduces the brain activity and enhances behavioral performance during kanji word-color stroop task: A multi-fiber NIRS study

Koike, Takayuki; Yamada, Hiroshi; Kaneki, Noriaki; Kamimura, Hironobu

doi:10.1109/cisim.2010.5643685

Cited by 2 publications

(3 citation statements)

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“…The findings indicated that intermittent odorant presentation enhance relaxation state and thus, reduce cognitive loadings due to Stroop interference that was counting pieces of digits. Previous studies showed cognitive loading was reduced by pleasant odor during word-color Stroop task [3] and oddball task [4]. Former study showed O 2 Hb in left forehead was significantly increased when pleasant odors, lavender and peppermint, were presented.…”

Section: Discussionmentioning

confidence: 96%

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Effect of Odorant Presentation on Changes in Cognitive Interference and Brain Activity during Counting Stroop Task

Koike

Kaneki

Yamada

et al. 2011

2011 International Conference on Biometrics and Kansei Engineering

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Cognitive task for longer duration increases subject's psychological loadings because of extracting ordered answer from visual stimuli. The present study investigated how intermittent odorant presentation during cognitive task contributes to cognitive function and statement of psychological loadings. We asked ten male subjects to perform counting stroop task that repeatedly counts the pieces of digits displayed on a monitor. The task consisted three tasks that the digits and the number were consisted (task1), non-consisted (task2), and both the former tasks combined (task3). The duration of each task was four minutes, and thus subjects totally performed the tasks for 12 minutes. Four kinds of odorant stimuli (non-odor, lemon, peppermint (pmint), and skatole (ska)) were used in this study and each odor was presented after beginning of each task for one minute. Behavioral results, rate of content of , , , and waves from EEG, and oxygenated hemoglobin concentration ( O 2 Hb) were measured and compared between each odor condition. Behavioral results, the reaction time and the percentage of questions answered correctly, O 2 Hb in right hemisphere related to pleasant emotion, and rate of content of wave were significantly increased when pmint and ska were presented. The findings indicated that intermittent odor presentation induced pleasant emotion and increased cognitive function and state of concentration, regardless of odors.

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Section: Discussionmentioning

confidence: 96%

“…Some studies report that, during aromatherapy, patients stir a memory from the past [8,9]. The other studies tested cognitive function of healthy subject reported that aroma presentation enhances cognitive function during cognitive task [3,4]. The studies suggest aroma sensation relieve symptoms of dementia patients.…”

Section: Introductionmentioning

confidence: 95%

Effect of Odorant Presentation on Changes in Cognitive Interference and Brain Activity during Counting Stroop Task

Koike

Kaneki

Yamada

et al. 2011

2011 International Conference on Biometrics and Kansei Engineering

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“…As a consequence, some natural odors have been used to relieve both psychological and physiological stresses. X. Duan et al [3] and T. Koike et al [4] reported that some pleasant odors, such as lavender, could show the apparent effect on the emotional state as well as autonomic nervous system activities. Generally, odor molecules have the direct influence on brain activities through the olfactory system.…”

Section: Introductionmentioning

confidence: 99%

Analysis of physiological and psychological responses to odor stimulation

Lin

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Heart rate variability (HRV) analyses as well as Stress Response Scale-18 (SRS-18) questionnaire were used to evaluate the effect of Jasmine-odor inhalation in males and females. Healthy 15 males (26.3 ± 3.7 years) and 15 females (30.1 ± 3.4 years) participated in the experiment. Standard Lead-II ECG data were collected for resting, control and odor stimulation conditions. The instantaneous heart rate variability tachogram was interpolated with the use of cubic spline interpolation, and then, FFT was performed to find the HRV power spectrum. HRV frequency domain analysis parameters were low frequency range (LF: 0.04 - 0.15Hz), high frequency range (HF: 0.15 - 0.4 Hz) and the ratio of normalized low frequency to high frequency (nLF/nHF). HRV time domain analysis parameters in this research were heart rate (bpm), the standard deviation of all normal to normal RR intervals (SDNN) and root mean square of successive RR intervals difference (RMSSD). Experimental results suggest that stress of both males and females decreased after exposing to odor (p<0.05). It was also found that heart rate decreasing rate of males was faster than that of females for odor sets. SDNN and RMSSD parameter were slightly increased in both odor and control experiment but not so much difference in both males and females. The nLF/nHF ratio of males are significantly higher than females in all measurement intervals (p<0.05). This might be intrinsic character of males and females. After odor exposure, the nLF/nHF ratio was slightly decreased in male subjects while it was slightly increased for all control intervals. Decreasing the nLF/nHF ratio might link to decreasing the stress. The nLF/nHF ratio in female subjects was not so much changed in both odor and control intervals with slightly increased trend. The results indicate that ECG measurement could be used to evaluate the stress state quantitatively. It will be alternative technique for stress evaluation other than using the qualitative measurement with SRS scale.

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The pleasant odor reduces the brain activity and enhances behavioral performance during kanji word-color stroop task: A multi-fiber NIRS study

Cited by 2 publications

References 10 publications

Effect of Odorant Presentation on Changes in Cognitive Interference and Brain Activity during Counting Stroop Task

Effect of Odorant Presentation on Changes in Cognitive Interference and Brain Activity during Counting Stroop Task

Analysis of physiological and psychological responses to odor stimulation

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