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Related Experiment Video

Updated: Jun 27, 2026

End-To-End Deep Neural Network for Salient Object Detection in Complex Environments
03:31

End-To-End Deep Neural Network for Salient Object Detection in Complex Environments

Published on: December 15, 2023

Attention-spreading based on hierarchical spatial representations for connected objects.

Tetsuko Kasai1

  • 1Faculty of Education, Hokkaido University, Sapporo, Japan. tetsu@edu.hokudai.ac.jp

Journal of Cognitive Neuroscience
|November 20, 2008
PubMed
Summary
This summary is machine-generated.

Attention spreads across connected visual objects, guided by two distinct electrophysiological processes. Early visual grouping (N1) and later object unity (N2pc) reveal object-based spatial selection mechanisms.

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Last Updated: Jun 27, 2026

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Published on: October 13, 2023

Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Electrophysiology

Background:

  • Attention is fundamental for selecting visual objects.
  • Attention may spread automatically across an object's entire region.
  • Previous research identified electrophysiological correlates of attention-spreading in visual grouping.

Purpose of the Study:

  • To examine the nature of object representations.
  • To investigate how the extent of perceptual grouping influences attention.
  • To control for symmetrical structures in bilateral visual stimuli.

Main Methods:

  • Utilized electrophysiological recordings (EEG).
  • Manipulated the connectedness of bilateral visual stimuli to alter perceptual grouping.
  • Controlled for symmetrical structures in stimuli.

Main Results:

  • Two distinct electrophysiological components (N1 and N2pc) were identified.
  • N1 (150-200 ms) correlated with perceptual grouping.
  • N2pc (310/330-390 ms) correlated with object unity.
  • Attention was guided twice, reflecting early grouping and later object unity.

Conclusions:

  • Object-based spatial selection involves at least two distinct cognitive processes.
  • These processes are linked to early perceptual grouping and later object unity.
  • Findings contribute to understanding cognitive mechanisms and object representations in attention.