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Related Experiment Video

Updated: Jun 14, 2026

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

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Published on: August 1, 2018

Top-down projections to the primary visual areas necessary for object recognition: a case study.

Christina Rizzi¹, Fabrizio Piras, Paola Marangolo

¹CeRin, Università degli Studi di Trento, Italy.

Vision Research

|April 1, 2010

Summary

A patient with right posterior ischemia developed visual agnosia, unable to recognize images but could read normally. This suggests a deficit in integrating visual elements into a unified percept, impacting object and face recognition.

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Area of Science:

Neuroscience
Cognitive Psychology
Visual Perception

Background:

Ischemic stroke can lead to focal neurological deficits.
Visual agnosia is a disorder characterized by the inability to recognize objects visually.

Observation:

A patient with right posterior ischemia presented with a selective deficit in recognizing pictures, objects, and faces.
Despite the visual recognition impairment, the patient could read and comprehend written material, recognizing letters and numbers.

Findings:

The patient's recognition deficit was not attributed to impaired structural description or semantic knowledge.
The core issue was identified as an inability to combine disparate visual elements into a coherent, unitary percept.
This suggests a specific impairment in global visual processing or higher-level integration mechanisms.

Implications:

The findings highlight dissociations between local and global visual processing.
This case provides insights into the interplay between bottom-up sensory input and top-down cognitive mechanisms in visual recognition.
Understanding these dissociations is crucial for diagnosing and potentially treating visual agnosia.