The categorization of natural scenes: brain attention networks revealed by dense sensor ERPs.

Full Abstract

The present study examined cortical indicators of selective attention underlying categorization based on target features in natural scenes. The primary focus was to determine the neural sources associated with the processing of target stimuli containing animals compared to non-target control stimuli. Neural source estimation techniques [current source density (CSD) and L2-minimum norm estimate (L2-MNE)] were used to determine the sources of the potential fields measured from 58 sensor sites. Assuring an excellent signal-to-noise ratio, the categorization task consisted of 2400 trials. Replicating previous findings, target and non-target ERP activity diverged sharply around 150 ms after stimulus onset and the early differential ERP activity appeared as positive deflection over fronto-central sensor sites and as negative deflection over temporo-occipital regions. Both source estimation techniques (CSD and L2-MNE) suggested primary sources of the early differential ERP activity in posterior, visual-associative brain regions and, although less pronounced, revealed the contribution of additional anterior sources. These findings suggest that selective attention to category-relevant features reflects the interactions between prefrontal and inferior temporal cortex during visual processing of natural scenes.

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Author information

Author/s: Codispoti, Maurizio (M); Ferrari, Vera (V); Junghöfer, Markus (M); Schupp, Harald T (HT);

Affiliation: Department of Psychology, University of Bologna, Italy. maurizio.codispoti(-atsign-)unibo.it

Journal and publication information

Publication Type: Journal Article

Journal: NeuroImage (Neuroimage), published in United States. (Language: eng)

Reference: 2006-Aug; vol 32 (issue 2) : pp 583-91

Dates: Created 2006/08/07; Completed 2006/10/18;

PMID: 16750397, status: MEDLINE (last retrieval date: 12/26/2008)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult
Attention - physiology
Brain Mapping
Cerebral Cortex - physiology
Contingent Negative Variation - physiology
Discrimination Learning - physiology
Dominance, Cerebral - physiology
Electroencephalography
Evoked Potentials, Visual - physiology
Female
Field Dependence-Independence
Frontal Lobe - physiology

Humans
Image Processing, Computer-Assisted
Imaging, Three-Dimensional
Male
Nerve Net - physiology
Pattern Recognition, Visual - physiology
Psychomotor Performance - physiology
Reaction Time - physiology
Signal Processing, Computer-Assisted
Software
Temporal Lobe - physiology
Visual Cortex - physiology

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