Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Clinical Trial
. 1995 Oct;20(5):505-15.
doi: 10.1093/chemse/20.5.505.

Electrocortical and Autonomic Alteration by Administration of a Pleasant and an Unpleasant Odor

Affiliations
Clinical Trial

Electrocortical and Autonomic Alteration by Administration of a Pleasant and an Unpleasant Odor

P Brauchli et al. Chem Senses. .

Abstract

The present study was designed to investigate whether there is a consistent response in ongoing EEG due to repetitive olfactory stimulation. Two odors of different hedonic quality were presented bilaterally to five male subjects at suprathreshold levels. A room-air blank served as the control stimulus. Each odor was presented six times to each subject in each of three sessions. Electrocortical activity, heart rate, skin conductance and breathing cycle were recorded continuously. EEG variables assessed were difference scores of absolute power in the frequency bands theta, alpha 1, alpha 2 and beta 1 at eight locations. Phenylethyl alcohol was rated pleasant, while valeric acid was judged unpleasant. Within 8 s after stimulus release, valeric acid increased alpha 2 power, whereas phenylethyl alcohol did not. No further frequency bands were affected by olfactory stimulation. These findings suggest that smelling an unpleasant odor leads to a cortical deactivation.

Similar articles

See all similar articles

Cited by 14 articles

See all "Cited by" articles

Publication types

LinkOut - more resources

Feedback