A new method for measuring reaction times for odour detection at iso-intensity: Comparison between an unpleasant and pleasant odour.
A psychophysical detection test was developed to measure the reaction time of human subjects to a pleasant and an unpleasant odour. The response latencies to stimulation with a malodour (valeric acid) and pleasant odorant (amyl acetate) were compared over a range of different stimulus strengths. By expressing reaction time as a function of detection rate, the responses to the two odours can be compared at iso-intensity across the concentration range. This is the first study that allows odorants to be compared at the same intensity over a range of concentrations. The malodour valeric acid was detected more rapidly than amyl acetate; at the 50% detection level the reaction time for the detection of amyl acetate was 1.74 s compared 1.36 s for valeric acid (380 ms or 22% faster). Women were significantly faster than men at detecting both the unpleasant (by 18%) and pleasant (by 26%) odour at the 50% detection level and this disparity increased with decreasing stimulus strength. In conclusion, we demonstrate the ability of a new method for the measurement of reaction times to odour detection to discriminate between two different odours - a malodour and a non-malodour.
School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3US, UK. jacob@cardiff.ac.uk
Tim J C
TJ
Jacob
Liwei
L
Wang
D000293:Adolescent; D000328:Adult; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D008297:Male; D010421:Pentanoic Acids / Q000494:pharmacology; D000439:Pentanols / Q000494:pharmacology; D011930:Reaction Time / Q000502:physiology*; D012903:Smell / Q000502:physiology*; D013268:Stimulation, Chemical
D010421:Pentanoic Acids; D000439:Pentanols; C005716:amyl acetate; C038780:n-pentanoic acid