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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/4558
- Odour and preference-induced changes in brain topography
- Owen, Caroline M.; Patterson, John
- Traditionally, research investigating preference responses to odours is qualitative, based on subjective reports. The research to be reported investigated an objective and quantitative technique to monitor physiological preference responses. This research indicated the potential for investigating the relationship of conscious awareness of odour presence to the production of topographical change, and the relationship between subjective ratings (the hedonic response) and the topographical brain response to various odours. In a study using eight subjects, continuous recordings of brain electrical activity were measured using a 64-channel recording system during the delivery of air or odour. Recording trials were repeated with four odours (acetaldehyde, butyric acid, isovaleric acid and vanillin) at near threshold concentrations. Stimulus delivery was synchronised with inspiration using a continuous respiration olfactometer, and presented at a ratio of 3 air to each odour in a pseudo-random order for a period of 5 min. Subjective responses to the odour stimuli were also assessed during the recording, with subjects indicating if they perceived an odour, following which they completed preference response ratings of the odour. Parallel testing of the same odours was conducted using traditional sensory testing techniques. The neurophysiological responses to odours were then examined and correlated with the preference responses. The evoked responses of all the odours differed in comparison to air and to each other. These responses were analysed using both traditional EEG topographic techniques and neural networks to determine the relationship of the responses to the reported preferences. This analysis demonstrated the utilisation of different techniques to better quantify the neurophysiological effects of odours, reducing the problem of the subjectivity of responses which is found in much of the research into hedonic responses to odours.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Sensory Neuroscience Laboratory
- International Journal of Psychophysiology: Abstracts from the 10th World Congress of the International Organization of Psychophysiology, Sydney, New South Wales, Australia, 08-13 February 2000, Vol. 35, no. 1 (Feb 2000), p. 30
- Publication year
- Brain topography; EEG; Odour; Physiological preferences
- Publisher URL
- Copyright © 2000 Elsevier Science B.V. All rights reserved.