The nose is hungrier than the eyes

Area of Science:

• Neuroscience and Sensory Perception
• Food Science and Nutrition
• Behavioral Psychology

Background:

• Vision and olfaction are primary senses for evaluating food before consumption.
• Current motivational models often assume equivalent roles for visual and olfactory sensory input in food appraisal.

Purpose of the Study:

• To investigate whether visual and olfactory sensory channels function equivalently in driving food desire and liking.
• To compare the impact of initial sensory exposure (vision vs. olfaction) on subsequent food-related judgments.

Main Methods:

• Participants rated desire for snacks based solely on smell or vision.
• Following initial sensory assessment, participants tasted snacks and rated liking and desire for more.
• These ratings were repeated after participants consumed a meal to assess state-dependent changes.

Main Results:

• Olfactory (smell) perception consistently elicited higher desire ratings than visual perception, regardless of participant state.
• When hungry, participants reported greater liking and desire for foods initially appraised via smell compared to vision.
• Visual desire ratings decreased more than smell-based ratings across the meal, indicating differential sensory habituation.

Conclusions:

• Motivational equivalence between olfaction and vision in food appraisal is not supported.
• Olfaction appears to be a more potent driver of initial food desire than vision.
• Greater reliance on memory for visual food desire may explain the observed differences between sensory modalities.