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Implicit and explicit memory for odors: hemispheric differences.

Mats J Olsson1, William S Cain

  • 1University of California, San Diego, California, USA. mats.olsson@psyk.uu.se

Memory & Cognition
|April 18, 2003
PubMed
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This study explored odor memory lateralization using monorhinic odor presentation. Findings suggest olfactory memory processing differs between brain hemispheres, influenced by the testing nostril.

Area of Science:

  • Neuroscience
  • Olfactory research
  • Cognitive psychology

Background:

  • Investigating hemispheric differences in sensory memory processing is crucial for understanding brain function.
  • Odor memory lateralization has been challenging to study due to methodological limitations.

Purpose of the Study:

  • To investigate the lateralization of odor memory using implicit and explicit memory tests.
  • To determine if odor memory performance differs between the left and right cerebral hemispheres.
  • To explore the role of monorhinic odor presentation in assessing olfactory memory lateralization.

Main Methods:

  • Two experiments utilized implicit (odor identification priming) and explicit (episodic recognition) memory tests.
  • Odors were presented monorhinically (to one nostril at a time) during both inspection and testing phases.

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  • Testing involved presenting odors to either the ipsilateral or contralateral side relative to the inspection nostril.

    • Main Results:

    • Implicit odor memory showed faster identification for primed odors presented to the left nostril compared to the right.
    • Explicit odor memory recognition performance did not differ significantly between nostrils.
    • Response latencies in explicit memory tasks favored the right nostril, suggesting faster processing.

    Conclusions:

    • Monorhinic odor presentation effectively reveals differences in cerebral hemisphere olfactory memory processing in healthy individuals.
    • The lateralization of odor memory appears to depend on the nostril used for testing, not the nostril used for initial odor inspection.
    • This study provides evidence for distinct hemispheric contributions to implicit and explicit odor memory.