Evidence for evolutionary divergence in temporal integration windows between human and monkey auditory cortex

Area of Science:

• Neuroscience
• Auditory Neuroscience
• Primate Cognition

Background:

• The temporal dimension of sound processing in the primate auditory cortex is not fully understood.
• Understanding how the brain processes acoustic time windows is crucial for comprehending auditory perception.

Purpose of the Study:

• To review and analyze studies on the cortical representation of temporal sound processing in humans and non-human primates (NHP).
• To identify commonalities and differences in temporal processing across species, particularly focusing on the auditory cortex.

Main Methods:

• Systematic review of functional magnetic resonance imaging (fMRI) and neurophysiological studies.
• Analysis of functional anatomy and response patterns to temporal integration in humans, macaques, and marmosets.

Main Results:

• A common organization for temporal processing exists in primates, with shorter time windows processed in postero-medial areas and longer windows in lateral areas.
• Human primary auditory cortex shows sensitivity to longer temporal timescales compared to macaque primary auditory cortex.
• Differences in neurobiological sensitivity align with observed behavioral differences between species.

Conclusions:

• The findings suggest potential evolutionary specialization in the human auditory cortex for processing longer temporal sound features.
• This specialization may be linked to the demands of speech processing, which requires sensitivity to extended timescales.