Residual perception of biological motion in cortical blindness.

Details

Serval ID
serval:BIB_061E848D874C
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Residual perception of biological motion in cortical blindness.
Journal
Neuropsychologia
Author(s)
Ruffieux N., Ramon M., Lao J., Colombo F., Stacchi L., Borruat F.X., Accolla E., Annoni J.M., Caldara R.
ISSN
1873-3514 (Electronic)
ISSN-L
0028-3932
Publication state
Published
Issued date
12/2016
Peer-reviewed
Oui
Volume
93
Number
Pt A
Pages
301-311
Language
english
Notes
Publication types: Case Reports ; Journal Article
Publication Status: ppublish
Abstract
From birth, the human visual system shows a remarkable sensitivity for perceiving biological motion. This visual ability relies on a distributed network of brain regions and can be preserved even after damage of high-level ventral visual areas. However, it remains unknown whether this critical biological skill can withstand the loss of vision following bilateral striate damage. To address this question, we tested the categorization of human and animal biological motion in BC, a rare case of cortical blindness after anoxia-induced bilateral striate damage. The severity of his impairment, encompassing various aspects of vision (i.e., color, shape, face, and object recognition) and causing blind-like behavior, contrasts with a residual ability to process motion. We presented BC with static or dynamic point-light displays (PLDs) of human or animal walkers. These stimuli were presented either individually, or in pairs in two alternative forced choice (2AFC) tasks. When confronted with individual PLDs, the patient was unable to categorize the stimuli, irrespective of whether they were static or dynamic. In the 2AFC task, BC exhibited appropriate eye movements towards diagnostic information, but performed at chance level with static PLDs, in stark contrast to his ability to efficiently categorize dynamic biological agents. This striking ability to categorize biological motion provided top-down information is important for at least two reasons. Firstly, it emphasizes the importance of assessing patients' (visual) abilities across a range of task constraints, which can reveal potential residual abilities that may in turn represent a key feature for patient rehabilitation. Finally, our findings reinforce the view that the neural network processing biological motion can efficiently operate despite severely impaired low-level vision, positing our natural predisposition for processing dynamicity in biological agents as a robust feature of human vision.

Keywords
Adult, Blindness, Cortical/diagnostic imaging, Blindness, Cortical/etiology, Blindness, Cortical/physiopathology, Choice Behavior/physiology, Corpus Striatum/diagnostic imaging, Corpus Striatum/physiopathology, Discrimination (Psychology)/physiology, Eye Movement Measurements, Female, Humans, Male, Middle Aged, Motion Perception/physiology, Myocardial Infarction/complications, Myocardial Infarction/diagnostic imaging, Myocardial Infarction/physiopathology, Myocardial Infarction/psychology, Neuropsychological Tests, Recognition (Psychology)/physiology, Video Recording, Young Adult
Pubmed
Create date
05/12/2016 18:03
Last modification date
20/08/2019 12:28
Usage data