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Related Experiment Video

Updated: Feb 24, 2026

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

Published on: August 1, 2018

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An increasingly efficient narrowband object-recognition channel along the ventral stream.

Ajay Subramanian1,2, Ekin Tünçok1,3, Jan W Kurzawski1,4

  • 1Department of Psychology, New York University, New York, NY, USA.

Biorxiv : the Preprint Server for Biology
|February 23, 2026
PubMed
Summary

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Curvature tuning in areas V2 and V4 of the developing macaque.

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Emergence of a contrast-invariant representation of naturalistic texture in macaque visual cortex.

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Early Visual Cortex Supports One-Shot Episodic Memory via Spatially Tuned Reactivation.

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Human object recognition relies on a narrow spatial frequency band. This study reveals this band is a readout constraint, not an early filter, becoming more noise-tolerant along the ventral stream.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Psychophysical studies show human object recognition is impaired by noise in a narrow 1.5-octave spatial frequency band.
  • This suggests visual recognition depends on a specific spatial frequency range.

Purpose of the Study:

  • To investigate the neural basis of the human object recognition band.
  • To determine if this recognition band is an early sensory filter or a later readout constraint.

Main Methods:

  • Used functional magnetic resonance imaging (fMRI) to measure blood-oxygen-level-dependent (BOLD) responses in the ventral visual stream (V1 to VTC).
  • Presented participants with band-pass noise and natural images corrupted by this noise.
  • Applied a correlation classifier to BOLD responses to identify the recognition bandwidth.
Keywords:
efficiencyfMRInoise toleranceobject recognitionspatial frequencyspatial-frequency channelsventral streamvisual cortex

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Last Updated: Feb 24, 2026

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Main Results:

  • Neural responses to noise alone broadened from 2 octaves in V1 to 5 octaves in VTC, unlike the behavioral recognition bandwidth.
  • A correlation classifier revealed a conserved 2-octave recognition bandwidth in BOLD responses to noisy images.
  • This 2-octave band exhibited increasing noise tolerance along the ventral stream, approaching behavioral levels in VTC.

Conclusions:

  • The object recognition band acts as a readout constraint, not an early sensory filter.
  • The ventral stream maintains a narrow object channel while enhancing noise tolerance for improved recognition.