Object concepts in the chemical senses

Area of Science:

• Sensory neuroscience
• Cognitive psychology
• Olfactory perception

Background:

• The 'object concept' describes how the brain constructs unified percepts from sensory input.
• Previous research primarily focused on vision and audition regarding object perception.
• The applicability of objecthood to chemical senses remains largely unexplored.

Purpose of the Study:

• To evaluate the chemical senses (taste, chemesthesis, olfaction) against criteria for object perception.
• To determine if and how these senses generate 'objects' or unified percepts.
• To understand the role of chemical senses in food identification and multimodal integration.

Main Methods:

• Conceptual analysis of taste, chemesthesis, and orthonasal olfaction based on established objecthood criteria.
• Examination of sensory feature integration, learning, and figure-ground segregation in chemical senses.
• Comparison of object perception mechanisms across different sensory modalities.

Main Results:

• Taste and chemesthesis do not meet the criteria for object generation; their components are perceived separately.
• Orthonasal olfaction (sniffing) strongly supports object generation, with odorants perceived as wholes.
• Odor object perception involves learning, feature integration, and figure-ground segregation, similar to other senses.

Conclusions:

• Orthonasal olfaction generates distinct odor objects, crucial for pre-ingestive food identification.
• Flavor perception relies on learned multimodal representations, with sniffing retrieving these 'flavor objects'.
• The brain employs similar object-extraction strategies across vision, audition, and olfaction for interpreting complex stimuli.