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Functional connectivity patterns in parosmia.

Divesh Thaploo1, Akshita Joshi2, Eren Yilmaz3

  • 1Smell & Taste Clinic, Department of Otorhinolaryngology, Universitätsklinikum Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany. Taploodivesh4@gmail.com.

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PubMed
Summary
This summary is machine-generated.

Parosmia, a smell disorder, is linked to reduced brain connectivity in olfactory areas. This study used functional MRI to show impaired information flow between memory, decision-making, and olfactory processing centers in patients with parosmia.

Keywords:
Executive controlFunctional connectivityHyposmiaParosmiaSalience

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Area of Science:

  • Neuroscience
  • Olfactory Research
  • Medical Imaging

Background:

  • Parosmia is a qualitative olfactory dysfunction characterized by distorted odor perception.
  • Understanding the central nervous system alterations in parosmia is crucial for diagnosis and treatment.

Purpose of the Study:

  • To investigate alterations in olfactory processing within the central nervous system using resting-state functional connectivity.
  • To identify specific brain networks and regions affected by parosmia.

Main Methods:

  • A cross-sectional study involving 145 patients diagnosed with parosmia.
  • Standardized questionnaires and olfactory testing (Sniffin' Sticks) were used for diagnosis.
  • Resting-state functional magnetic resonance imaging (fMRI) scans were acquired using a 3T scanner.

Main Results:

  • Whole-brain analysis revealed reduced functional connectivity in salience and executive control networks.
  • Region of interest analyses showed decreased connectivity between primary/secondary olfactory areas (temporal pole, supramarginal gyrus, orbitofrontal cortex) and olfactory cortices (piriform cortex).

Conclusions:

  • Patients with parosmia demonstrate reduced functional connectivity between memory, decision-making centers, and primary/secondary olfactory areas.
  • These findings suggest a disruption in the neural pathways underlying olfactory perception and integration in parosmia.