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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Related Experiment Video

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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Emergence of visual objects involves multiple stages of spatial selection.

Tetsuko Kasai1, Ryuji Takeya, Sho Tanaka

  • 1Faculty of Education, Hokkaido University, Sapporo, 060-0811, Japan, tetsu@edu.hokudai.ac.jp.

Attention, Perception & Psychophysics
|November 27, 2014
PubMed
Summary
This summary is machine-generated.

This study shows how spatial attention affects object perception using event-related potentials (ERPs). Object-based attention influences early visual processing stages, impacting the N1, P2, and N2 components.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Psychology

Background:

  • Attention can operate on individual objects or spatial regions.
  • Previous research linked spatial attention spreading within objects to the N1 component of event-related potentials (ERPs) at 140-180 ms.

Purpose of the Study:

  • To investigate object-based spatial attention effects on perceptual object formation.
  • To analyze the timing of visual processing stages influenced by attention.

Main Methods:

  • Recorded lateralized ERPs over the posterior scalp in response to bilateral unfilled line objects.
  • Manipulated object connectedness and perceptual task difficulty.
  • Examined attention effects on N1, P2, and N2 ERP components.

Main Results:

  • Spatial attention modulated ERP components (N1, P2, N2) reflecting object processing.
  • Findings suggest attention influences multiple stages of visual object formation.
  • The timing of these attentional effects varied across ERP components.

Conclusions:

  • Object-based spatial attention impacts early and intermediate visual processing.
  • ERP components provide insights into the temporal dynamics of perceptual object formation.
  • This research clarifies the role of attention in constructing visual objects.