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Automatic Processing and Automatic Social Behavior01:28

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Automatic processing refers to the cognitive operations that occur without conscious intent or awareness, playing a fundamental role in shaping social cognition and behavior. These processes enable individuals to navigate complex social environments efficiently by relying on mental shortcuts and pre-existing knowledge structures known as schemas. One of the most influential mechanisms underlying automatic processing is priming, which subtly activates mental representations through exposure to...
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Related Experiment Video

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Online Repetitive Transcranial Magnetic Stimulation of Dorsomedial and Dorsolateral Prefrontal Cortex in Cognition Decision Making, and Cognitive Dissonance
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Changes in human brain dynamics during behavioral priming and repetition suppression.

Anna Korzeniewska1, Yujing Wang1, Heather L Benz1

  • 1Department of Neurology, Johns Hopkins University, Baltimore, Maryland, 21287, USA.

Progress in Neurobiology
|March 22, 2020
PubMed
Summary
This summary is machine-generated.

Behavioral priming, or faster responses to repeated stimuli, involves complex brain activity. Electrocorticography revealed that stronger top-down neural network influences underlie this efficiency, challenging previous assumptions.

Keywords:
Effective connectivityEvent related causality (ERC)ExpectationIntracranial EEGLanguageLarge scale brain network

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Neurology

Background:

  • Behavioral priming enhances stimulus response speed through repetition.
  • This implicit learning is vital but impaired in neurological disorders like Alzheimer's.
  • Repetition suppression (weaker neural response to repeated stimuli) paradoxically co-occurs with faster behavioral priming.

Purpose of the Study:

  • To investigate the neural mechanisms underlying behavioral priming and repetition suppression.
  • To resolve the paradox of faster behavioral responses despite weaker neural signals with stimulus repetition.
  • To test neurophysiological models using high-precision electrocorticography (ECoG) in humans.

Main Methods:

  • Used electrocorticography (ECoG) for high spatial-temporal precision analysis.
  • Recorded neural activation and propagation during visual object naming tasks.
  • Compared responses to novel versus repeated visual stimuli in patients.

Main Results:

  • Stimulus repetition led to faster verbal responses and reduced neural activation (repetition suppression) in ventral occipito-temporal cortex (VOTC) and left prefrontal cortex (LPFC).
  • Increased neural activation (repetition enhancement) was observed in LPFC and other areas.
  • High gamma propagation analysis showed increased top-down influences from LPFC to VOTC preceding repetition suppression.

Conclusions:

  • Repetition suppression and behavioral priming are linked to strengthened top-down network control over perception.
  • Findings support predictive coding models of repetition suppression.
  • Changes in large-scale cortical dynamics are crucial for efficient and rapid behavioral responses.