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Related Experiment Video

Updated: Feb 23, 2026

Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography

Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography

Published on: July 26, 2019

Prior expectations induce prestimulus sensory templates.

Peter Kok^1,2,3, Pim Mostert⁴, Floris P de Lange⁴

¹Donders Institute for Brain, Cognition and Behaviour, Radboud University, 6525 EN Nijmegen, The Netherlands; peter.kok@yale.edu.

Proceedings of the National Academy of Sciences of the United States of America

|September 14, 2017

Summary

This summary is machine-generated.

Expectations prime the brain for upcoming sensory input, creating neural templates before stimuli arrive. This predictive coding mechanism enhances behavioral performance for relevant stimuli.

Keywords:

feature-based attention feature-based expectation perceptual inference prediction predictive coding

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Area of Science:

Neuroscience
Cognitive Science
Perception Research

Background:

Perception integrates sensory data with prior expectations.
Neural mechanisms underlying expectation-driven perception remain unclear.
Previous fMRI studies show expectation-related activation but lack temporal resolution.

Purpose of the Study:

To investigate the neural implementation of expectation in perception.
To determine if expectations preactivate neural representations of stimuli.
To link prestimulus neural activity to behavioral outcomes.

Main Methods:

Combined magnetoencephalography (MEG) with multivariate decoding.
Analyzed neural signals in a time-resolved manner.
Investigated prestimulus neural activity related to expectations.

Main Results:

Identified stimulus-specific neural representations prior to stimulus presentation.
Demonstrated that expectations induce preactivation of neural templates.
Found correlation between prestimulus template strength and behavioral improvement.

Conclusions:

Expectations actively shape neural processing before sensory input.
Prestimulus neural activity reflects predictive coding mechanisms.
This provides insight into the neural basis of predictive perception.