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Related Experiment Video

Updated: Sep 14, 2025

Olfactory Context Dependent Memory: Direct Presentation of Odorants
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Odor-induced Sustained Neural Activity during Memory Encoding.

Joan Tarrida1, Manuel Moreno1, Jordi Vidal2

  • 1University of Barcelona.

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Summary
This summary is machine-generated.

Even brief exposure to odors can cause lasting neural and memory changes. Unpleasant odors particularly enhance memory encoding and confidence for later visual events, showing sustained brain activity.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Olfactory Perception

Background:

  • The duration of neural and cognitive effects from brief olfactory stimuli is not well understood.
  • Investigating sustained changes in brain activity and memory formation following odor exposure is crucial.

Purpose of the Study:

  • To determine how long neural and cognitive effects of brief odor experiences last.
  • To examine if short exposures to pleasant and unpleasant odors induce sustained changes in brain activity.
  • To assess the influence of odors on memory formation for events occurring seconds later.

Main Methods:

  • Electroencephalography (EEG) was used to record brain activity.
  • Univariate event-related potential (ERP) analyses and time-resolved multivariate decoding were employed.
  • Neural responses were tracked during a 6-second delay between odor presentation and visual memory encoding.

Main Results:

  • Brief odor cues triggered sustained neural activity that persisted beyond the odor's offset.
  • Unpleasant odors resulted in higher sustained ERP amplitudes compared to pleasant odors.
  • Participants exhibited increased confidence in recognizing images preceded by unpleasant odors.

Conclusions:

  • Brief olfactory experiences can induce lasting neural activity.
  • Olfactory cues significantly modulate memory encoding for temporally distant events.
  • These findings highlight the enduring impact of olfactory stimuli on brain function and memory.