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Olfactory sensitivity for aliphatic alcohols in squirrel monkeys and pigtail macaques

Matthias Laska^* and Alexandra Seibt

Department of Medical Psychology, University of Munich Medical School, Goethestraße 31, D-80336 Munich, Germany

View larger version (27K): [in a new window]   Fig. 1. Performance of three squirrel monkeys in discriminating between various dilutions of a given 1-alcohol and the odourless solvent. Each data point represents the percentage of correct choices from 10 1-min trials comprising a total of at least 60 decisions. Filled symbols indicate dilutions that were not discriminated above chance level (dotted line) (binomial test, P>0.05).

View larger version (21K): [in a new window]   Fig. 2. Performance of three squirrel monkeys in discriminating between various dilutions of a given isomeric alcohol and the odourless solvent. Each data point represents the percentage of correct choices from 10 1-min trials comprising a total of at least 60 decisions. Filled symbols indicate dilutions that were not discriminated above chance level (dotted line) (binomial test, P>0.05).

View larger version (16K): [in a new window]   Fig. 3. Olfactory detection threshold values (expressed as vapour phase concentrations) of the three squirrel monkeys as a function of carbon chain length of the aliphatic alcohols tested.

View larger version (29K): [in a new window]   Fig. 4. Performance of four pigtail macaques in discriminating between various dilutions of a given 1-alcohol and the odourless solvent. Each data point represents the percentage of correct choices from 30 decisions. Filled symbols indicate dilutions that were not discriminated above chance level (dotted line) (binomial test, P>0.05).

View larger version (23K): [in a new window]   Fig. 5. Performance of four pigtail macaques in discriminating between various dilutions of a given isomeric alcohol and the odourless solvent. Each data point represents the percentage of correct choices from 30 decisions. Filled symbols indicate dilutions that were not discriminated above chance level (dotted line) (binomial test, P>0.05).

View larger version (17K): [in a new window]   Fig. 6. Olfactory detection threshold values (expressed as vapour phase concentrations) of the four pigtail macaques as a function of carbon chain length of the aliphatic alcohols tested.

View larger version (14K): [in a new window]   Fig. 7. Comparison of the olfactory detection threshold values (expressed as vapour phase concentrations) of the squirrel monkeys and the pigtail macaques for aliphatic alcohols with those of other mammalian species. Human data are from Cometto-Muniz and Cain (1990) and Devos et al. (1990); animal data are from Laska (1990) and Passe and Walker (1985). Threshold is measured in parts per million.

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