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Updated: May 27, 2026
09:25
Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography
Published on: July 26, 2019
Long-term memory prepares neural activity for perception.
Mark G Stokes1, Kathryn Atherton, Eva Zita Patai
1Department of Experimental Psychology, University of Oxford, Oxford OX1 3UD, United Kingdom. mark.stokes@ohba.ox.ac.uk
Summary
Past experiences stored in long-term memory (LTM) sharpen perception by guiding attention to predicted locations. This memory-guided attention involves specific brain activity changes in visual and frontoparietal networks.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Perception
Background:
- Past experience is crucial for optimizing perception.
- Neural mechanisms integrating long-term memory (LTM) with perception are not fully understood.
Purpose of the Study:
- To investigate how LTM content optimizes perception through anticipatory brain states.
- To elucidate the neural basis of memory-guided attention.
Main Methods:
- Utilized a paradigm combining LTM and attentional orienting.
- Employed electroencephalography (EEG) to analyze brain oscillations.
- Used functional magnetic resonance imaging (fMRI) to examine brain activity.
Main Results:
- LTM content enhanced perceptual sensitivity at memory-predicted locations.
- Memory-guided attention correlated with alpha-band desynchronization in visual cortex (EEG).
- LTM-based spatial predictions modulated preparatory activity in extrastriate visual cortex (fMRI).
Conclusions:
- LTM optimizes perception by modulating anticipatory neural states.
- A network including the hippocampus and dorsal frontoparietal regions organizes these preparatory states in visual cortex.
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