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Related Experiment Videos

Sensorimotor gating deficits and hypofrontality in schizophrenia.

E A Hazlett1, M S Buchsbaum

  • 1Department of Psychiatry, Box 1505, Mount Sinai School of Medicine, 1 Gustave L. Levy Place, New York, NY 10029, USA. erin.hazlett@mssm.edu

Frontiers in Bioscience : a Journal and Virtual Library
|September 5, 2001
PubMed
Summary

Schizophrenia patients show impaired sensorimotor gating, specifically in attentional modulation of prepulse inhibition (PPI). This suggests a breakdown in frontal and occipital lobe coordination for information processing.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • Schizophrenia is characterized by deficits in sensorimotor gating, indicated by impaired prepulse inhibition (PPI) of the startle reflex.
  • This impairment suggests abnormalities in both automatic and controlled information processing in schizophrenia patients.
  • Attentional modulation of PPI is crucial for cognitive control and may be deficient in schizophrenia.

Purpose of the Study:

  • To investigate the hypothesis of deficient attentional modulation of PPI in schizophrenia.
  • To explore the interrelationship between frontal lobe executive functions and posterior sensory processing in schizophrenia.
  • To utilize Positron Emission Tomography (PET) to examine brain activity during an attentional task.

Main Methods:

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  • Compared unmedicated schizophrenia patients (n=15) with healthy controls (n=15).
  • Assessed frontal/occipital metabolic ratios using PET during a tone-length-judgment task (attention-to-prepulse).
  • Correlated attentional modulation of PPI with frontal/occipital ratios in both groups.

    • Main Results:

    • Schizophrenia patients exhibited lower frontal/occipital ratios ('hypofrontality') compared to controls.
    • Better attentional modulation of PPI was associated with higher frontal/occipital ratios in controls.
    • This association was not observed in the schizophrenia patient group.

    Conclusions:

    • Findings support the role of frontal and occipital lobe coordination in PPI modulation.
    • Deficient attentional modulation of PPI in schizophrenia may stem from impaired frontal-posterior brain communication.
    • These results extend animal findings to human studies, highlighting the importance of brain region interplay.