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A Decline in Response Variability Improves Neural Signal Detection during Auditory Task Performance.

Gardiner von Trapp¹, Bradley N Buran², Kamal Sen³

¹Center for Neural Science, g.vontrapp@nyu.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|November 1, 2016

Summary

This summary is machine-generated.

Engaging in an auditory detection task reduces neural response variability, enhancing neural sensitivity and improving auditory perception. This suggests task engagement overcomes limitations in neural encoding for better stimulus detection.

Keywords:

amplitude modulation attention auditory cortex neurometric signal detection theory

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Area of Science:

Neuroscience
Auditory Neuroscience
Sensory Perception

Background:

Sensory stimulus detection relies on changes in neural activity.
Trial-to-trial response variability in sensory neurons can impair perceptual performance.
Reduced neural variability, with constant firing rate, can enhance neural sensitivity.

Purpose of the Study:

To investigate if auditory detection task engagement modulates neural response variability.
To determine if reduced variability during task performance improves neural sensitivity.
To link neural thresholds with perceptual thresholds during auditory tasks.

Main Methods:

Telemetric recordings from the core auditory cortex of gerbils.
Comparison of neural activity during an amplitude-modulation detection task versus quiet listening.
Application of a signal detection theory framework to analyze neural sensitivity and response variability.

Main Results:

Neural sensitivity was significantly improved during auditory detection task performance.
This improvement in sensitivity was strongly correlated with a decrease in neural response variability.
Neural units exhibiting the largest reduction in variability showed thresholds closest to perceptual thresholds.

Conclusions:

Task engagement diminishes limitations imposed by neural response variability.
Reduced variability enhances the sensitivity of neural encoding in the auditory cortex.
Improved neural sensitivity during tasks may lead to enhanced perceptual sensitivity.