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Related Experiment Video

Updated: Jun 22, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
07:08

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Published on: August 1, 2018

Representing the forest before the trees: a global advantage effect in monkey inferotemporal cortex.

Arun P Sripati1, Carl R Olson

  • 1Center for Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA. sparun@cnbc.cmu.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 19, 2009
PubMed
Summary

Humans perceive large shapes before small shapes, a phenomenon observed in the inferotemporal cortex (IT). This neural processing difference, occurring around 30 milliseconds, supports a coarse-to-fine visual scene representation model.

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Last Updated: Jun 22, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
07:08

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

Published on: January 23, 2017

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Hierarchical stimuli (e.g., large shapes made of small shapes) are used to study global vs. local visual perception.
  • A consistent 'global advantage effect' shows humans perceive global shapes faster than local ones.
  • The neural basis for this global advantage effect is not well understood.

Purpose of the Study:

  • To investigate the neuronal underpinnings of the global advantage effect in visual perception.
  • To explore the role of the inferotemporal cortex (IT) in processing hierarchical visual information.
  • To test a coarse-to-fine model of visual scene representation.

Main Methods:

  • Recorded neuronal activity in the inferotemporal cortex (IT) of monkeys viewing hierarchical stimuli.
  • Analyzed the timing of neuronal responses to global versus local shape information.
  • Correlated neural signaling with behavioral observations of shape perception.

Main Results:

  • Inferotemporal (IT) neurons signaled global shape information approximately 30 milliseconds before local shape information.
  • This temporal difference was linked to spatial scale/frequency, not just hierarchical level.
  • Neural representation of larger shapes developed earlier than smaller shapes in IT.

Conclusions:

  • Demonstrated a neural correlate and potential mechanism for the global advantage effect in IT.
  • Findings support a coarse-to-fine model of visual scene processing.
  • Suggests that visual system processing prioritizes larger-scale features initially.