The brain uses single-trial multisensory memories to discriminate without awareness

Micah M. Murray, John J. Foxe, Glenn R. Wylie

Research output: Contribution to journalArticle

58 Scopus citations

Abstract

Multisensory experiences enhance perceptions and facilitate memory retrieval processes, even when only unisensory information is available for accessing such memories. Using fMRI, we identified human brain regions involved in discriminating visual stimuli according to past multisensory vs. unisensory experiences. Subjects performed a completely orthogonal task, discriminating repeated from initial image presentations intermixed within a continuous recognition task. Half of initial presentations were multisensory, and all repetitions were exclusively visual. Despite only single-trial exposures to initial image presentations, accuracy in indicating image repetitions was significantly improved by past auditory-visual multisensory experiences over images only encountered visually. Similarly, regions within the lateral-occipital complex-areas typically associated with visual object recognition processes-were more active to visual stimuli with multisensory than unisensory pasts. Additional differential responses were observed in the anterior cingulate and frontal cortices. Multisensory experiences are registered by the brain even when of no immediate behavioral relevance and can be used to categorize memories. These data reveal the functional efficacy of multisensory processing.

Original languageEnglish (US)
Pages (from-to)473-478
Number of pages6
JournalNeuroImage
Volume27
Issue number2
DOIs
StatePublished - Aug 15 2005

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Keywords

  • Auditory
  • Cross-modal
  • Lateral-occipital complex (LOC)
  • Memory
  • Multisensory
  • Object recognition
  • Visual
  • fMRI

ASJC Scopus subject areas

  • Neurology
  • Cognitive Neuroscience

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