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Human olfaction: a constant state of change-blindness
1Department of Neurobiology, The Weizmann Institute of Science, Rehovot, 76100, Israel.
Experimental Brain Research
|July 7, 2010
Summary
Humans have a poor awareness of smell due to the limited spatial and temporal nature of olfactory attention. This "change anosmia" means we miss smells, despite their subconscious influence on behavior.
Area of Science:
- Neuroscience
- Sensory Perception
- Cognitive Science
Background:
- Humans possess a highly sensitive sense of smell but exhibit low olfactory awareness.
- Olfactory perception is often overridden by other senses, despite low odorant detection thresholds.
Purpose of the Study:
- To investigate the reasons behind humans' limited olfactory awareness.
- To explore the role of spatial and temporal factors in shaping olfactory attention.
Main Methods:
- Analysis of the spatial and temporal characteristics of olfactory input.
- Comparison of olfactory attention mechanisms with those of vision and audition.
- Examination of the concept of "change blindness" and its parallel in olfaction ("change anosmia").
Main Results:
- Human olfactory spatial abilities are minimal, lacking a defined space for selective attention.
- Olfactory input is discrete (separated by sniffs), unlike the continuous input of vision and audition.
- The long intervals between sniffs lead to "change anosmia," a normal lack of awareness to olfactory changes.
Conclusions:
- Minimal attentional capture in olfaction results in low human olfactory awareness.
- Sub-attentive olfactory mechanisms significantly influence human behavior and perception subliminally.
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