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A System for Tracking the Dynamics of Social Preference Behavior in Small Rodents

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Published on: November 21, 2019

Neuronal phase consistency tracks dynamic changes in acoustic spectral regularity.

Adam M Gifford¹, Michael R Sperling², Ashwini Sharan²

¹Neuroscience Graduate Group, University of Pennsylvania, Philadelphia, Pennsylvania.

The European Journal of Neuroscience

|November 8, 2018

Summary

The brain tracks changing spectral regularities using neural phase consistency (PC) across multiple frequency bands, especially the delta band. This widespread mechanism is vital for auditory processing and potentially other senses.

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Area of Science:

Neuroscience
Auditory Perception
Signal Processing

Background:

The brain groups auditory features based on spectral regularities.
How the auditory system tracks unpredictable, dynamic spectral regularities is unknown.
The role of brain regions beyond auditory cortex in coding spectral regularity is unclear.

Purpose of the Study:

Investigate neural tracking of dynamic spectral regularities.
Explore the contribution of downstream brain regions to spectral regularity coding.
Identify neuronal mechanisms for analyzing spectral regularities.

Main Methods:

Recorded human electrocorticography (ECoG) during auditory stimulation.
Presented tone-burst sequences with dynamically varying spectral regularities.
Analyzed oscillatory stimulus phase consistency (PC) across neuronal-frequency bands.

Main Results:

Stimulus phase consistency (PC) in multiple frequency bands tracked spectral regularity.
Delta-frequency band PC showed the strongest correlation with spectral regularity.
Regularity representations were found across multiple cortical regions.

Conclusions:

Phase-based modulations are a general mechanism for tracking regularity in sensory systems.
Widespread PC modulation suggests a general neural coding strategy.
The delta-frequency band plays a significant role in processing auditory regularity.