Anxiety, emotion and cerebral blood flow

Area of Science:

• Neuroscience
• Psychophysiology
• Medical Imaging

Background:

• Anxiety disorders are prevalent and impact cognitive function.
• Cerebral blood flow (CBF) is a key indicator of brain activity.
• Understanding anxiety's neural correlates is crucial for developing targeted interventions.

Purpose of the Study:

• To investigate regional cerebral blood flow (rCBF) differences between high and low trait anxiety individuals.
• To examine the influence of emotional auditory stimuli on rCBF in relation to anxiety levels.
• To explore potential brain asymmetry patterns associated with trait and state anxiety.

Main Methods:

• Regional cerebral blood flow (rCBF) was measured using the xenon inhalation technique.
• A DSPECT system was employed for precise rCBF quantification.
• Subjects underwent neutral and emotional auditory stimulations.
• Participants were categorized into high and low trait anxiety groups (n=10 each).
• State anxiety was assessed retrospectively.

Main Results:

• Individuals with high trait or state anxiety exhibited lower overall rCBF.
• A significant global rCBF asymmetry (right > left hemisphere) was observed in high anxiety subjects.
• Emotional auditory stimuli significantly modulated rCBF, particularly in the thalamic region, interacting with brain laterality.

Conclusions:

• Anxiety is associated with reduced cerebral blood flow and altered hemispheric balance.
• Emotional processing in anxiety involves specific neural pathways, notably within the thalamus.
• These findings highlight the neurobiological underpinnings of anxiety and its response to emotional stimuli.