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Using internal memory representations in associative learning to study hallucination-like phenomenon.

Ming Teng Koh1, Michela Gallagher1

  • 1Department of Psychological and Brain Sciences, Johns Hopkins University, USA.

Neurobiology of Learning and Memory
|October 3, 2020
PubMed
Summary
This summary is machine-generated.

Pavlovian conditioning shapes behavior via internal representations. This review explores how these representations, when overactive, may cause hallucinations, offering new therapeutic targets for psychosis.

Keywords:
CognitionDopamineHallucinationMediated learningPsychosisSchizophrenia

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • Pavlovian conditioning demonstrates how event relationships guide behavior through internal mental representations.
  • Internal representations are crucial for adaptively integrating new information and influencing actions and outcomes.

Purpose of the Study:

  • To review how internal representations integrate updated information during reinforcer revaluation.
  • To highlight representation-mediated learning and its similarities to direct activation.
  • To explore the link between internal representations and hallucinations in psychosis.

Main Methods:

  • Review of behavioral and neural activation studies.
  • Analysis of animal models of schizophrenia.
  • Examination of clinical studies in patients with psychosis.

Main Results:

  • Internal representations flexibly integrate new information, influencing behavior.
  • Similarities exist between internally generated and directly activated representations.
  • Increased evocation of internal representations from associative experience is linked to hallucination-like percepts in schizophrenia and psychosis.
  • This heightened propensity is modulated by dopaminergic activation and hippocampal overexcitability.

Conclusions:

  • Overactive internal representations, influenced by dopaminergic pathways and hippocampal activity, may underlie hallucinations in psychosis.
  • The identified neural network offers a novel therapeutic target for psychosis interventions.