Gender differences in the perception of pungency

Area of Science:

• Sensory science
• Neuroscience
• Human physiology

Background:

• Carbon dioxide (CO2) is a common pungent stimulus.
• Understanding gender differences in sensory perception is crucial for various applications.
• Previous research has not fully elucidated sex-based variations in CO2 pungency perception.

Purpose of the Study:

• To investigate gender differences in the perceived intensity of carbon dioxide (CO2) pungency.
• To compare CO2 perception via nasal and oral routes.
• To analyze the relationship between CO2 concentration and perceived intensity using different scaling methods.

Main Methods:

• Participants: Healthy adult males and females.
• Stimulus: Carbon dioxide (CO2) gas presented nasally and orally.
• Procedures: Magnitude estimation and magnitude matching scaling techniques were employed.
• Reference Stimulus: Sucrose sweetness was used as a reference for magnitude matching.

Main Results:

• Significant gender differences in CO2 pungency were found only for nasal stimulation.
• Females exhibited a steeper power function for nasal CO2 pungency (exponent 2.2) compared to males (exponent 1.6).
• Magnitude matching revealed females perceived nasal CO2 pungency as more intense than males, relative to sucrose sweetness.
• No significant gender differences in perceived buccal (oral) CO2 pungency were observed; both genders showed a power function with an exponent of 1.1.
• Buccal CO2 pungency perception did not differ between genders when referenced to sweetness.

Conclusions:

• Perception of nasal carbon dioxide (CO2) pungency differs between genders, with females reporting higher intensity.
• This gender-specific difference in nasal CO2 perception may be linked to the nasal environment's susceptibility to hormonal and neural influences.
• Oral CO2 pungency perception is similar between males and females.