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Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography

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Magnetic source localization of early visual mismatch response.

Ana Susac¹, Dirk J Heslenfeld, Ralph Huonker

¹Department of Physics, Faculty of Science, University of Zagreb, Bijenicka 32, 10 000, Zagreb, Croatia, ana@phy.hr.

Brain Topography

|December 12, 2013

Summary

The visual mismatch negativity (vMMN) response, based on sensory memory, is feature-specific. Its neural generators are located in the occipital cortex and are independent of attention.

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How to Detect Amygdala Activity with Magnetoencephalography using Source Imaging

How to Detect Amygdala Activity with Magnetoencephalography using Source Imaging

Published on: June 3, 2013

Area of Science:

Neuroscience
Cognitive Science
Visual Perception

Background:

The visual mismatch negativity (vMMN) is a brain response linked to sensory memory.
The precise neural origins and attentional requirements of the vMMN remain incompletely understood.

Purpose of the Study:

To identify the neural generators of the sensory-memory-based vMMN.
To investigate the attention dependence of the vMMN response to unattended visual stimuli.

Main Methods:

Magnetoencephalography (MEG) and spatio-temporal source localization were employed.
Participants performed a central visual task while peripheral grating patterns were presented.
vMMN was derived by comparing MEG responses to infrequent versus equiprobable gratings in non-attended conditions.

Main Results:

The vMMN response peaked between 100 and 160 ms.
Neuromagnetic sources of vMMN were localized to the occipital cortex.
vMMN sources differed from those evoked by equiprobable stimuli and were stimulus-dependent.

Conclusions:

The findings suggest distinct neural systems for pre-attentive visual change detection based on memory.
New evidence supports the feature-specific nature of the visual mismatch negativity.
The vMMN is generated independently of attentional focus.