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Related Concept Videos

Negative and Cognitive Symptoms of Schizophrenia01:30

Negative and Cognitive Symptoms of Schizophrenia

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Negative symptoms of schizophrenia indicate a reduction or absence of typical behaviors and emotional responses found in healthy individuals, while positive symptoms reflect an excess or distortion of normal functioning.
Negative Symptoms
Negative symptoms of schizophrenia manifest as deficits in normal emotional and behavioral functioning, profoundly impacting daily life. Individuals with schizophrenia often display a flat affect, characterized by a near-total absence of emotional expression,...
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Spectral EEG abnormalities during vibrotactile encoding and quantitative working memory processing in schizophrenia.

Simon Ludwig1, Bernhard Spitzer2, Arthur M Jacobs3

  • 1Neurocomputation and Neuroimaging Unit, Freie Universität Berlin, Germany; Berlin School of Mind and Brain, Humboldt-Universität zu Berlin, Germany.

Neuroimage. Clinical
|May 10, 2016
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Summary
This summary is machine-generated.

Schizophrenia patients exhibit impaired sensory encoding and working memory (WM) maintenance of vibrotactile stimuli. These findings suggest early somatosensory deficits and problems forming abstract representations in schizophrenia.

Keywords:
EEGSchizophreniaSomatosensorySteady-state evoked potential (SSEP)Working memory

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Psychiatry

Background:

  • Schizophrenia is linked to cognitive deficits, including sensory encoding and working memory (WM) impairments.
  • The precise neural mechanisms linking these deficits to altered stimulus representation remain unclear.

Purpose of the Study:

  • To investigate neural correlates of sensory encoding and WM maintenance in schizophrenia using vibrotactile stimuli.
  • To differentiate between early sensory processing deficits and higher-level cognitive impairments.

Main Methods:

  • Utilized a sequential frequency comparison paradigm with vibrotactile stimuli.
  • Measured frequency-specific steady-state evoked potentials (SSEPs) over the primary somatosensory cortex (S1) for sensory encoding.
  • Assessed working memory (WM) maintenance via beta-band EEG oscillations and prefrontal cortex activity.
  • Controlled for general attention deficits using behavioral tests and alpha-band analysis.

Main Results:

  • Schizophrenia patients displayed reduced SSEPs and inter-trial phase coherence during vibrotactile stimulation compared to controls.
  • Patients showed weaker prefrontal beta-power modulation during WM maintenance of frequency information.
  • No significant attention deficits were observed in patients.

Conclusions:

  • Patients with schizophrenia exhibit altered neural processing for both stimulus-specific sensory encoding and working memory (WM) maintenance.
  • Results suggest an early somatosensory impairment and difficulties in forming abstract representations in schizophrenia.
  • These findings contribute to understanding the neural basis of cognitive deficits in schizophrenia.