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Related Experiment Videos

Delayed hemodynamic responses in schizophrenia.

Judith M Ford1, Matthew B Johnson, Susan L Whitfield

  • 1Department of Psychiatry, Yale University School of Medicine, New Haven, CT 06520, USA. judith.ford@yale.edu

Neuroimage
|June 16, 2005
PubMed
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Schizophrenia patients show delayed hemodynamic responses in key brain areas, unlike previous findings of reduced amplitude. This discovery impacts understanding schizophrenia

Area of Science:

  • Neuroimaging
  • Cognitive Neuroscience
  • Psychiatric Disorders

Background:

  • Previous research on schizophrenia often noted reduced hemodynamic response amplitude.
  • Event-related potential (ERP) studies suggested slowed neural responses in schizophrenia.
  • No prior reports documented delayed hemodynamic responses in schizophrenia.

Purpose of the Study:

  • To investigate for delayed hemodynamic responses in schizophrenia using functional magnetic resonance imaging (fMRI).
  • To apply a novel method for detecting small latency differences in hemodynamic responses.
  • To explore the relationship between psychomotor slowing and hemodynamic response delays.

Main Methods:

  • Utilized fMRI during a visual oddball task with infrequent targets.

Related Experiment Videos

  • Employed SPM99 to estimate hemodynamic response and its temporal derivative (TD).
  • Calculated hemodynamic response latencies using TD and beta values in schizophrenia patients and healthy controls.

    • Main Results:

    • Hemodynamic responses were significantly delayed in the basal ganglia, thalamus, and anterior cingulate in schizophrenia patients.
    • Activation height differences between groups were minimal.
    • Psychomotor slowing correlated with hemodynamic slowing in specific brain regions in controls.

    Conclusions:

    • Delayed hemodynamic responses represent a novel finding in schizophrenia pathophysiology.
    • These delays may stem from slowed neural processing or substrate delivery.
    • Potential methodological implications for fMRI analysis in schizophrenia exist.