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Olfactory sensitivity for aliphatic aldehydes in squirrel monkeys and pigtail macaques
1Department of Medical Psychology, University of Munich Medical School, Goethestr 31, 80336, Munich, Germany. Laska@imp.med.uni-muenchen.de
Summary
Squirrel monkeys and pigtail macaques possess keen olfactory sensitivity to aldehydes. Pigtail macaques generally outperformed squirrel monkeys, with detection thresholds below 1 part per billion for some aldehydes.
Area of Science:
- Olfactory neuroscience
- Primate sensory perception
- Chemosensation
Background:
- Olfactory sensitivity varies significantly across species.
- Assessing olfactory performance in non-human primates is crucial for understanding sensory evolution.
- Aliphatic aldehydes represent a common class of odorants with diverse biological roles.
Purpose of the Study:
- To quantitatively assess and compare the olfactory sensitivity of squirrel monkeys and pigtail macaques to a homologous series of aliphatic aldehydes.
- To investigate the relationship between olfactory detection thresholds and the carbon chain length of these odorants within and between species.
- To evaluate the predictive power of neuroanatomical features for olfactory performance in primates.
Main Methods:
- A conditioning paradigm was employed to train and test three squirrel monkeys and three pigtail macaques.
- Olfactory detection thresholds for aliphatic aldehydes ranging from n-butanal to n-nonanal were determined.
- Statistical analyses were performed to compare performance between species and correlate thresholds with chemical structure.
Main Results:
- Both primate species demonstrated significant olfactory sensitivity to aliphatic aldehydes, detecting concentrations below 1 part per million (ppm).
- Pigtail macaques generally exhibited superior performance compared to squirrel monkeys in detecting these odorants.
- Individual pigtail macaques achieved detection thresholds below 1 part per billion (ppb) for n-butanal and n-hexanal.
- No significant correlation was found between olfactory detection thresholds and the carbon chain length of the tested aldehydes in either species.
Conclusions:
- Squirrel monkeys and pigtail macaques possess well-developed olfactory systems for aliphatic aldehydes.
- Olfactory performance in primates is not solely predicted by neuroanatomical characteristics or gene counts.
- These findings suggest olfaction plays a significant, potentially underestimated, role in regulating behavior in these primate species.
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