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Updated: Feb 24, 2026
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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
Summary
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.
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.
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