Localizing the human brain response to olfactory stimulation: A meta-analytic approach

Area of Science:

• Neuroscience
• Olfactory system research

Background:

• The human sense of smell is crucial for environmental monitoring and behavior.
• Understanding olfactory processing aids in safety and food evaluation.

Purpose of the Study:

• To create activation probability maps of the olfactory system.
• To generate separate maps for pleasant, food, and aversive odors.
• To enhance the understanding of olfactory system's functional anatomy.

Main Methods:

• Utilized Activation Likelihood Estimation (ALE) method.
• Performed formal statistical analysis on inter-study concordance.
• Included 81 studies (108 contrasts, 1053 foci).

Main Results:

• Significant ALE peaks found in olfactory-associated brain areas.
• Observed activation in piriform cortex, amygdala, insula, and orbitofrontal cortex.
• Contrast analyses revealed distinct neural patterns for different odor categories.

Conclusions:

• Olfactory system activation is consistent across studies.
• Specific odor categories elicit unique neural responses.
• Provides a functional neuroanatomic map of human olfaction.