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Decrease and increase in brain activity during visual perceptual priming: an fMRI study on similar but perceptually

François Blondin1, Martin Lepage

  • 1Brain Imaging Group, Douglas Hospital Research Centre and Department of Psychiatry, McGill University, 6875 Boul. LaSalle, Verdun, Que., Canada.

Neuropsychologia
|September 20, 2005
PubMed
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Visual priming effects, characterized by reduced neural activity, extend beyond single objects to complex scenes. This study demonstrates priming in visual processing areas for similar yet distinct landscape images.

Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Visual Perception

Background:

  • Functional neuroimaging studies consistently show decreased neural activity in extrastriate and inferior prefrontal cortices during visual priming.
  • This priming effect, where neural activity lessens with repeated exposure, has been observed for identical objects and perceptually similar exemplars.

Purpose of the Study:

  • To investigate whether visual priming effects, specifically reduced neural activity, occur for successive presentations of similar complex visual scenes.
  • To determine if priming extends beyond single object recognition to scene-level processing.

Main Methods:

  • Participants viewed landscape pictures divided into three segments, with a first segment presented followed later by a related second segment.
  • Behavioral measures (reaction times) and functional neuroimaging (BOLD signal changes) were used to assess neural responses.

Related Experiment Videos

Main Results:

  • Faster reaction times were observed for the second segment presentation compared to the first, indicating behavioral priming.
  • Reduced neural activity was found in late-stage visual processing areas (e.g., parahippocampal/fusiform gyri, occipital and temporal gyri) for the second segment, despite perceptual differences.
  • Increased activity in frontal and parietal regions, associated with memory retrieval, was also observed.

Conclusions:

  • Visual priming effects can be elicited by complex visual scenes that are similar in composition but perceptually distinct.
  • These findings extend the understanding of neural mechanisms underlying visual priming from single objects to complex scenes.
  • Priming of complex scenes involves reduced activity in visual processing areas and increased activity in memory retrieval networks.