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Related Experiment Video

Updated: Feb 2, 2026

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

Published on: February 11, 2014

Coarse-to-fine information integration in human vision.

Kirsten Petras¹, Sanne Ten Oever², Christianne Jacobs¹

¹Research Institute for Psychological Science, Université Catholique de Louvain, Louvain-la-Neuve, Belgium.

|November 8, 2018

Summary

Coarse visual information from low spatial frequencies (LSF) guides the processing of fine details (HSF) in the brain. This study used EEG decoding to show LSF modulates HSF processing in natural images.

Keywords:

Coarse-to-fine Electroencephalography Human face perception Multivariate decoding Spatial frequency Temporal generalization

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Area of Science:

Neuroscience
Visual Perception
Cognitive Science

Background:

Coarse-to-fine theories suggest low spatial frequencies (LSF) guide high spatial frequency (HSF) processing.
The role of LSF in modulating HSF in naturalistic stimuli remains unclear.

Purpose of the Study:

To investigate how LSF influences HSF processing in the human brain using naturalistic images.
To test the coarse-to-fine hypothesis in visual information integration.

Main Methods:

Used electroencephalography (EEG) to record brain activity.
Employed multivariate decoding to differentiate LSF and HSF contributions to neural responses.
Presented participants with broad-band, LSF-filtered, HSF-filtered, and phase-scrambled images of faces.

Main Results:

EEG decoding successfully separated LSF and HSF neural contributions.
HSF processing was reduced when LSF provided informative content about the image.
Findings support the coarse-to-fine model of visual processing.

Conclusions:

Coarse visual information (LSF) actively guides the integration of finer visual details (HSF).
This modulation occurs even with naturalistic, broad-band visual input.
Results suggest feedback mechanisms in the visual cortex facilitate coarse-to-fine processing.