Differential affection of the visual information sub-streams in a patient with visual agnosia.

ABSTRACT:

Introduction

Visual agnosia is a deficit of object recognition addressed to the damage of the ventral stream (VS). The dorsal stream (DS) is usually intact in these patients, and it can be derived from well-preserved reaching and grasping of visually presented objects. In this study, we presented a new case of a visual agnosic patient (AC) with an extensive lesion of the secondary visual cortex.

Methods

We examined the kinematics of his grasping behavior towards common day-to-day objects compared to a healthy control group. Both colored and color-masked objects were presented, and participants were instructed to grasp-then-name and name-then-grasp them.

Results

The agnosic deficit was particularly evident when no color information was available to the patient: Althoug

SUBMITTER: Lederer K 

PROVIDER: S-EPMC11862234 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature