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Evidence for peripheral plasticity in human odour response.
Liwei Wang1, Lixin Chen, Tim Jacob
1School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3US, UK.
The Journal of Physiology
|December 18, 2003
Summary
Repeated exposure can help people smell androstenone, even if they couldn't before. This study shows changes in the nose and brain (olfactory evoked potential and olfactory event-related potential) correlate with improved smell sensitivity, indicating olfactory system plasticity.
Area of Science:
- Neuroscience
- Olfactory Research
- Sensory Perception
Background:
- Some individuals are unable to detect the odorant androstenone (anosmic).
- Sensitivity to odorants can potentially be modified through exposure.
- Understanding olfactory plasticity is crucial for sensory science.
Purpose of the Study:
- To investigate the neurophysiological basis of acquired sensitivity to androstenone.
- To explore the relationship between olfactory detection thresholds and electrophysiological responses.
- To demonstrate odourant-specific plasticity in the human peripheral olfactory system.
Main Methods:
- Olfactory threshold testing was used to measure detection sensitivity.
- Intranasal electrophysiology measured olfactory evoked potentials (EOG).
- Electroencephalography (EEG) recorded olfactory event-related potentials (OERP) on the scalp.
Main Results:
- A direct proportionality was found between detection threshold and EOG amplitude.
- EOG amplitude was correlated with OERP amplitude, linking peripheral and central responses.
- Repetitive androstenone exposure reduced detection thresholds and increased EOG and OERP amplitudes.
Conclusions:
- Acquired sensitivity to androstenone is associated with measurable changes in olfactory electrophysiology.
- Increased EOG and OERP amplitudes reflect enhanced neural processing of the odorant.
- Findings support the existence of odourant-specific plasticity within the peripheral olfactory system.