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Related Experiment Video

Updated: Jun 2, 2026

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

Hemifield effects of spatial attention in early human visual cortex.

Antje Kraft¹, Stefanie Kehrer, Herbert Hagendorf

¹Department of Neurology, Universitätsmedizin Charité, Berlin Neuroimaging Center, Charitéplatz 1, 10117 Berlin, Germany.

The European Journal of Neuroscience

|May 7, 2011

Summary

Visual attention processing is more efficient within a single visual hemifield than across both. Early visual areas show greater information integration within one hemifield, explaining this bilateral field advantage.

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Area of Science:

Neuroscience
Visual Perception
Cognitive Neuroscience

Background:

Early visual areas (V1-V4v) process contralateral visual hemifields.
The role of visual hemifields in attention processing hierarchy is not well understood.
Hypothesized bilateral field advantage for attentional processing efficiency.

Purpose of the Study:

To investigate the effect of distance and hemifield on parallel attentional processing.
To examine information integration within and across visual hemifields in early visual areas.
To correlate neuroimaging findings with behavioral observations.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used.
Attentional processing was examined at individually mapped retinotopic locations in early visual areas (V1-V4v).
Locations were aligned adjacently or separately within or across hemifields.

Main Results:

A bilateral field advantage was observed in parallel attentional processing over separated attended locations.
This advantage is partly attributed to differences in distractor position integration in early visual areas.
Greater integration of locations was found within one hemifield compared to across hemifields.

Conclusions:

Early visual areas play a role in the observed bilateral field advantage for attention.
Information integration differs between within-hemifield and across-hemifield processing.
Findings align with behavioral data on attentional processing advantages and limitations.