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Amygdala-prefrontal cortex connectivity increased during face discrimination but not time perception.

Emre H Kale1,2, Sertaç Üstün3, Metehan Çiçek1,2,3

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Emotional faces do not alter time perception. Brain imaging revealed that while time perception involves frontoparietal networks, fear stimuli did not impact duration judgments or brain activity related to expression.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Emotional stimuli, particularly threatening ones, can influence time sensitivity.
  • The interaction between emotion and time perception is complex and influenced by factors like task type and duration.

Purpose of the Study:

  • To investigate the neural mechanisms underlying the interaction between emotional face perception and time perception.
  • To evaluate how fearful versus neutral facial expressions affect time judgments and associated brain activity.

Main Methods:

  • Utilized a two-interval forced-choice task with healthy volunteers presenting fearful and neutral faces.
  • Employed functional magnetic resonance imaging (fMRI) and finite impulse response analysis to examine brain activity.
  • Conducted psycho-physical interaction analysis to explore functional connectivity between brain regions.

Main Results:

  • Time perception was associated with a right-lateralized frontoparietal network.
  • Face discrimination activated the amygdala and the fusiform face area (FFA).
  • No significant effect of emotional expression (fearful vs. neutral) on brain activity or behavioral time judgments was observed; specifically, fearful faces did not lead to duration overestimation.

Conclusions:

  • The study suggests that prefrontal-amygdala connectivity may be crucial for processing emotional facial stimuli.
  • Factors such as attentional load, task type, and task difficulty likely modulate the influence of emotion on time perception.
  • Emotional expression did not directly impact time perception in this specific task paradigm.