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Sensitivity to voice in human prefrontal cortex.

Shirley Fecteau1, Jorge L Armony, Yves Joanette

  • 1Départment de Psychologie, Université de Montréal, C.P. 6128, Succ. Centre-ville, Montreal, Quebec H3C 3J7, Canada. shirley.fecteau@umontreal.ca

Journal of Neurophysiology
|June 2, 2005
PubMed
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This study found a specific brain region in the left inferior prefrontal cortex sensitive to human voices, including emotional vocalizations. This discovery suggests a dedicated prefrontal auditory area in humans, mirroring findings in macaque brains.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Auditory Neuroscience

Background:

  • The human brain possesses specialized regions for processing auditory information.
  • Previous research has identified auditory domains in primate brains, but human prefrontal auditory processing remains less understood.

Purpose of the Study:

  • To investigate the presence and characteristics of a voice-sensitive region within the human prefrontal cortex.
  • To determine if this region responds to different types of vocalizations (speech, non-linguistic) and emotional content.

Main Methods:

  • Two functional magnetic resonance imaging (fMRI) experiments were conducted.
  • Participants were exposed to various human vocalizations, including speech and non-linguistic sounds, varying in emotional valence.

Related Experiment Videos

  • Brain activity in the left inferior prefrontal cortex, specifically pars orbitalis, was analyzed.

    • Main Results:

    • A distinct region in the left inferior prefrontal cortex (pars orbitalis) showed enhanced activation in response to human voices.
    • This voice-sensitive response was observed for both speech and non-linguistic vocalizations.
    • The activation was significantly stronger for emotional vocalizations compared to neutral ones.

    Conclusions:

    • The identified region in the left inferior prefrontal cortex acts as a human prefrontal auditory domain.
    • This finding suggests a potential homologous auditory processing area in humans similar to those found in macaque brains.
    • This region plays a role in processing vocalizations, with heightened sensitivity to emotional content.