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Related Experiment Video

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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

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Predictive cues for auditory stream formation in humans and monkeys.

Nikolaos C Aggelopoulos¹, Susann Deike², Elena Selezneva¹

¹Special Lab of Primate Neurobiology, Leibniz Institute for Neurobiology, Brenneckestr. 6, 39118, Magdeburg, Germany.

The European Journal of Neuroscience

|December 19, 2017

Summary

Auditory perception improves with predictable stimuli. Regularity in sound patterns significantly enhances human detection of auditory deviants and boosts neural responses in monkeys, more than fixed timing (isochrony).

Keywords:

auditory cortex deviant detection isochrony macaque monkey rhythm

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Infant Auditory Processing and Event-related Brain Oscillations

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Published on: July 1, 2015

Area of Science:

Neuroscience
Auditory Perception
Psychoacoustics

Background:

Auditory perception is enhanced by stimulus predictability.
Previous studies showed improved neural activity in the auditory cortex with predictable stimuli.
Predictability can stem from fixed timing (isochrony) or pattern repetition (regularity).

Purpose of the Study:

To investigate whether isochrony or regularity independently contributes to enhanced neuronal and behavioral responses.
To differentiate the effects of isochrony and regularity on auditory deviance detection and neural activity.

Main Methods:

Human subjects performed auditory deviance detection tasks with sequences varying in isochrony and regularity.
Macaque monkey primary auditory cortex neuronal responses were recorded during sequence presentations.
Isochrony and regularity were independently manipulated in stimulus sequences.

Main Results:

Human detection performance significantly improved with regularity.
Isochrony only enhanced detection when regularity was also present.
In monkeys, regularity increased sustained neural responses; isochrony had no consistent effect.

Conclusions:

Regularity is a more potent factor than isochrony in enhancing auditory perception and neural processing.
The findings from human and monkey studies converge, highlighting regularity's significant influence.
Predictability in auditory streams, particularly through regularity, optimizes neural and behavioral performance.