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Obstructive sleep apnea (OSA) patients show increased brain activation during verbal learning tasks, suggesting a compensatory brain response. This compensatory mechanism may impact neuroimaging study results.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Sleep Medicine

Background:

  • Obstructive sleep apnea (OSA) is a prevalent sleep disorder associated with cognitive impairments.
  • Previous research suggests alterations in brain function in OSA patients, but specific cerebral responses to cognitive tasks require further investigation.

Purpose of the Study:

  • To investigate the cerebral activation patterns during a verbal learning (VL) task in patients with obstructive sleep apnea (OSA) using functional magnetic resonance imaging (fMRI).
  • To explore the relationship between brain activation, verbal learning performance, and potential compensatory mechanisms in OSA.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to study 12 patients with OSA and 12 healthy controls during a verbal learning task.
  • Performance metrics, including free recall, were assessed and correlated with brain activation patterns.

Main Results:

  • While verbal learning performance was comparable between OSA patients and controls, OSA patients exhibited significantly increased brain activation in regions including the inferior frontal gyrus, middle frontal gyrus, cingulate gyrus, thalamus, and cerebellum.
  • Enhanced activation in the left inferior frontal gyrus and left supramarginal gyrus was associated with better free recall in OSA patients.
  • Negative correlation was observed between recall performance and activation in the left inferior parietal lobe.

Conclusions:

  • Intact verbal learning performance in OSA patients is associated with increased cerebral activation, indicating an adaptive compensatory recruitment response.
  • These findings highlight characteristic differences in the Blood-Oxygen-Level-Dependent (BOLD) signal response to cognitive challenges in individuals with OSA.
  • The presence of untreated OSA can influence neuroimaging results, necessitating consideration of this factor in future research design.