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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
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Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
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Scents boost preference for novel fruits.

Yuki Yamada1, Kyoshiro Sasaki2, Satomi Kunieda3

  • 1Faculty of Arts and Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

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Olfactory cues influence food preference, even when smells are detected unconsciously. This study shows that unconscious smell processing impacts how we prefer novel fruits, affecting our decisions about edibility.

Keywords:
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Area of Science:

  • Food science
  • Sensory science
  • Cognitive neuroscience

Background:

  • Multisensory information, including visual and olfactory cues, is critical for food preference and categorization.
  • The role of olfactory information, especially when presented subliminally, in biasing visual perception and preference for novel foods remains underexplored.

Purpose of the Study:

  • To investigate whether olfactory information biases visual categorization and preference for fruits, even when odors are presented subliminally.
  • To understand the interplay between conscious and unconscious olfactory processing and its effect on food preference.

Main Methods:

  • Utilized morphed images of strawberries and tomatoes paired with their corresponding odorants as stimuli.
  • Participants performed visual categorization tasks, rated visual image preferences, and judged odor presence/absence.
  • Manipulated odor presentation to include both subliminal and consciously detectable levels.

Main Results:

  • Visual categorization of fruit images was not significantly affected by odor manipulation.
  • Participant preference for uncategorizable images increased when odors were presented, irrespective of odor awareness.
  • Unconscious olfactory processing demonstrably influenced visual preference ratings.

Conclusions:

  • Visual preference for novel fruits is influenced by both conscious and unconscious olfactory processing.
  • Olfactory cues play a significant role in assessing the edibility of novel foods, impacting preference beyond conscious perception.
  • Findings highlight the complex integration of sensory information in food choice decisions.