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Related Experiment Video

Updated: Sep 15, 2025

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Glutamatergic mechanisms in early salience processing.

Denise Elfriede Liesa Lockhofen1, Nils Hübner1, Ranjan Debnath1

  • 1Centre of Psychiatry, Justus-Liebig University, Giessen, Hessen, Germany.

Frontiers in Pharmacology
|July 16, 2025
PubMed
Summary

Ketamine disrupts attentional processing of salient distractors, impacting gamma band activity. These findings highlight the glutamate system's role in schizophrenia's negative symptoms and sensory processing.

Keywords:
EEGadditional singleton taskattentionearly salienceglutamateglutamate hypothesisketamineschizophrenia

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • Schizophrenia is linked to impaired salience attribution, attention, and reward learning.
  • The glutamate hypothesis suggests N-methyl-D-aspartate receptor (NMDAR) dysfunction contributes to schizophrenia symptoms.
  • NMDAR antagonists like ketamine induce temporary schizophrenia-like symptoms in healthy individuals.

Purpose of the Study:

  • To investigate the effects of subclinical ketamine on attention and reward interaction.
  • To examine how ketamine influences processing of salient, reward-related distractors during a visual attention task.

Main Methods:

  • 27 healthy volunteers received intravenous ketamine or placebo.
  • Electroencephalography (EEG) recorded brain activity during a visual attention task.
  • Task involved salient, reward-related distractors alongside target stimuli.

Main Results:

  • Ketamine primarily impaired distractor processing, with minimal impact on target or reward processing.
  • Increased gamma band power was observed with ketamine, particularly during salient distractor trials.
  • These ketamine-induced effects correlated with negative symptom severity.

Conclusions:

  • Ketamine's effects on gamma oscillations and salience processing support the glutamate hypothesis of schizophrenia.
  • Findings suggest a link between glutamatergic dysregulation, attentional deficits, and negative symptoms in schizophrenia.