Differential affection of the visual information sub-streams in a patient with visual agnosia
IntroductionVisual 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 n...
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Frontiers Media S.A.
2025-02-01
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fpsyg.2025.1452979/full |
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| author | Kirstin Lederer Bruno Fimm Jorn Munzert Mathias Reiser Heiko Maurer Ferdinand Binkofski Ferdinand Binkofski Ferdinand Binkofski Antonello Pellicano |
| author_facet | Kirstin Lederer Bruno Fimm Jorn Munzert Mathias Reiser Heiko Maurer Ferdinand Binkofski Ferdinand Binkofski Ferdinand Binkofski Antonello Pellicano |
| author_sort | Kirstin Lederer |
| collection | DOAJ |
| description | IntroductionVisual 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.MethodsWe 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.ResultsThe agnosic deficit was particularly evident when no color information was available to the patient: Although AC was able to recognize most colored objects with marked delay, his recognition of color-masked objects was very poor. Furthermore, the color-masked condition determined larger impairments in kinematic performance relative to the control group.DiscussionResults support the view that spared color processing in the VS allows for partial compensation of deficits. Color information is also processed along the DS, contributing to visuomotor transformations. |
| format | Article |
| id | doaj-art-7fc9ff735cf349a0b245ad597a59d826 |
| institution | Kabale University |
| issn | 1664-1078 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Psychology |
| spelling | doaj-art-7fc9ff735cf349a0b245ad597a59d8262025-02-12T09:00:19ZengFrontiers Media S.A.Frontiers in Psychology1664-10782025-02-011610.3389/fpsyg.2025.14529791452979Differential affection of the visual information sub-streams in a patient with visual agnosiaKirstin Lederer0Bruno Fimm1Jorn Munzert2Mathias Reiser3Heiko Maurer4Ferdinand Binkofski5Ferdinand Binkofski6Ferdinand Binkofski7Antonello Pellicano8Division for Clinical Cognitive Research, Department of Neurology, University Hospital RWTH Aachen, Aachen, GermanyDepartment of Neurology, University Hospital RWTH Aachen, Aachen, GermanyInstitute for Sport Sciences, University of Gießen, Giessen, GermanyInstitute for Sport Sciences, University of Gießen, Giessen, GermanyInstitute for Sport Sciences, University of Gießen, Giessen, GermanyDivision for Clinical Cognitive Research, Department of Neurology, University Hospital RWTH Aachen, Aachen, GermanyInstitute for Neuroscience and Medicine (INM-4), Research Center Jülich GmbH, Jülich-Aachen, GermanyJARA Brain, Jülich-Aachen, GermanyDepartment of Educational Sciences, University of Catania, Catania, ItalyIntroductionVisual 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.MethodsWe 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.ResultsThe agnosic deficit was particularly evident when no color information was available to the patient: Although AC was able to recognize most colored objects with marked delay, his recognition of color-masked objects was very poor. Furthermore, the color-masked condition determined larger impairments in kinematic performance relative to the control group.DiscussionResults support the view that spared color processing in the VS allows for partial compensation of deficits. Color information is also processed along the DS, contributing to visuomotor transformations.https://www.frontiersin.org/articles/10.3389/fpsyg.2025.1452979/fullvisual agnosiaV2 lesionkinematicsgraspingcolor informationdorsal stream |
| spellingShingle | Kirstin Lederer Bruno Fimm Jorn Munzert Mathias Reiser Heiko Maurer Ferdinand Binkofski Ferdinand Binkofski Ferdinand Binkofski Antonello Pellicano Differential affection of the visual information sub-streams in a patient with visual agnosia Frontiers in Psychology visual agnosia V2 lesion kinematics grasping color information dorsal stream |
| title | Differential affection of the visual information sub-streams in a patient with visual agnosia |
| title_full | Differential affection of the visual information sub-streams in a patient with visual agnosia |
| title_fullStr | Differential affection of the visual information sub-streams in a patient with visual agnosia |
| title_full_unstemmed | Differential affection of the visual information sub-streams in a patient with visual agnosia |
| title_short | Differential affection of the visual information sub-streams in a patient with visual agnosia |
| title_sort | differential affection of the visual information sub streams in a patient with visual agnosia |
| topic | visual agnosia V2 lesion kinematics grasping color information dorsal stream |
| url | https://www.frontiersin.org/articles/10.3389/fpsyg.2025.1452979/full |
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