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Effect of frequency deviance direction on performance and mismatch negativity.

Irene S Karanasiou¹, Charalabos Papageorgiou, Miltiades Kyprianou

¹Institute of Communications and Computer Systems, School of Electrical and Computer Engineering, National Technical University of Athens, 1st Department of Psychiatry, Eginition Hospital, Greece. ikaran@esd.ece.ntua.gr

Journal of Integrative Neuroscience

|January 21, 2012

Summary

Mismatch negativity (MMN) is more sensitive to increases than decreases in auditory frequency, impacting performance and brain activity. This suggests MMN processing differs based on frequency deviance direction.

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Area of Science:

Auditory Neuroscience
Cognitive Neuroscience
Electrophysiology

Background:

Mismatch negativity (MMN) reflects automatic auditory change detection.
Previous research explored frequency deviance direction's effect on MMN and performance.
The current study investigates frequency MMN and performance in an auditory identification task.

Purpose of the Study:

To examine how positive and negative frequency deviances affect auditory identification performance.
To analyze the impact of frequency deviance direction on stimulus-locked event-related potentials (ERPs).
To investigate differences in brain activation maps related to frequency deviance direction.

Main Methods:

Auditory identification task with controlled frequency deviants (positive and negative).
Measurement of behavioral performance (error commission).
Analysis of stimulus-locked ERPs, focusing on MMN at the Fz electrode.
Generation of brain activation maps using neuroimaging techniques.

Main Results:

Frequency deviants increased the likelihood of errors, particularly positive deviants.
Significant performance decrease was observed for positive frequency deviants.
ERP amplitudes at Fz (164 ms) were larger for mismatch conditions with positive deviants.
Brain activation maps showed significant differences in frontal areas (Brodmann area 11, superior frontal gyrus) for mismatch conditions.

Conclusions:

Behavioral and ERP responses dissociate between positive and negative frequency deviance processing.
MMN appears more sensitive to frequency increments than decrements.
Findings support the role of MMN in automatic perceptual inference of auditory changes.