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Area of Science:

  • Sensory Science
  • Neuroscience
  • Biomedical Engineering

Background:

  • Existing olfactometers can deliver target odors in odorless air.
  • No olfactometer could deliver target odors within a background odor stream.
  • Measuring reaction time to target odors amidst background odors is challenging.

Purpose of the Study:

  • To develop an expanded olfactometer capable of delivering target odor pulses within a background odor flow.
  • To evaluate the performance of the expanded olfactometer in delivering target odors.
  • To measure human reaction times to target odors under background odor conditions.

Main Methods:

  • An attachment was added to an existing olfactometer to create the expanded olfactometer.
  • Three experiments were conducted to assess the expanded olfactometer's performance.
  • Four volunteers participated in trials measuring reaction time to a target odor with and without background odor.

Main Results:

  • The expanded olfactometer successfully delivered target odor pulses into a background odor flow.
  • Onset and rise times for the target odor were in milliseconds, while background odor times were in seconds.
  • No significant difference was found in target odor delivery between the existing and expanded olfactometers.
  • Reaction time to the target odor was marginally longer in the presence of background odor.

Conclusions:

  • An attachment was successfully developed to enable target odor presentation within background odor streams.
  • The expanded olfactometer performs comparably to existing models for target odor presentation.
  • Background odors may slightly increase odor detection reaction times, warranting further investigation with more participants.