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Updated: Jun 7, 2026

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

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

Published on: August 1, 2018

Visual object detection, categorization, and identification tasks are associated with different time courses and

Stephan de la Rosa¹, Rabia N Choudhery, Astros Chatziastros

¹Department of Human Perception, Cognition and Action. delarosa@kyb.tuebingen.mpg.de

Journal of Experimental Psychology. Human Perception and Performance

|November 3, 2010

Summary

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Visual Agnosia

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...

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Visual object recognition involves distinct stages for detecting an object, identifying its basic category, and recognizing its subordinate category. These processes have different time courses and sensitivities, especially when examined with fine temporal resolution.

Area of Science:

Cognitive psychology
Neuroscience
Visual perception

Background:

The temporal relationship between object detection and explicit recognition is a key area of research.
Understanding the component processes of visual object recognition is crucial for cognitive models.

Purpose of the Study:

To investigate the time course and sensitivity of three potential visual object recognition processes.
To determine if temporal resolution impacts the observed differences between recognition stages.

Main Methods:

Participants viewed briefly presented or noise-masked images of objects and non-object textures.
Tasks included reporting object presence, basic-level category, and subordinate category.
Recognition performance was measured using accuracy and reaction times with varying temporal sampling.

Related Experiment Videos

Last Updated: Jun 7, 2026

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

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

Published on: August 1, 2018

Main Results:

Object detection, basic-level categorization, and subordinate-level categorization showed distinct time courses and sensitivities.
Finer temporal sampling enhanced performance differences between detection and basic-level categorization.
Coarser temporal sampling reduced the observed differences between these early recognition stages.

Conclusions:

The three investigated processes of visual object recognition are separable based on their temporal dynamics and sensitivity.
Fine temporal resolution is critical for accurately dissociating early stages of visual object recognition.
These findings contribute to a more nuanced understanding of the temporal unfolding of object recognition in the brain.