Purpose: Traditionally, post-chiasmatic lesions were believed to result in complete and permanent visual loss in the topographically related areas of the visual field. However, a number of studies with monkeys, and later with humans, have demonstrated spared implicit visual functioning, referred to as 'blindsight'. The present study assessed whether training this phenomenon would induce an objective restoration of conscious vision in the blind field of hemianopic patients.
Methods: For a period of 22 weeks nine patients with unilateral occipital damage participated in several forced-choice visual tasks known to elicit blindsight: pointing to visual targets, letter recognition, visual comparison between the two hemifields, target localization, and letter identification. Before and after rehabilitation, patients were submitted to a behavioral pre- and post-test, including visual detection and letter identification as well as to automated perimetry visual field testing (Humphrey Automated 24-2 Full Threshold).
Results: An objective improvement was found in the behavioral tasks for all patients at the post-test stage as well as an objective enlargement of the contralesional visual field for all except one of the nine patients. An overall decrease is seen in the number of undetected points (out of 30) on automated perimetry visual field testing after rehabilitation (F (1, 16)=22.57; p<0.001) for both eyes (Right Eye, RE: T=0; z=2.52; p<0.05; Left Eye, LE: T=0, z=2.37; p<0.05) regardless of lesion side.
Conclusions: The results suggest that explicit (conscious) visual detection can be restored in the blind visual field by using implicit (unconscious) visual capacities. Results are discussed regarding visual field defect rehabilitation, blindsight, attention, and brain plasticity hypotheses.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
A Case Report of Recurrent Primary Pituitary Abscess: Challenges in Diagnosis and Treatment.
Endocr Metab Immune Disord Drug Targets
January 2025
Department of Neurosurgery, Istanbul University-Cerrahpaşa, Istanbul, Turkey.
Background: Primary pituitary abscess is a rare disease with no specific symptoms for pituitary abscess alone. A preoperative diagnosis is quite challenging due to unclear imaging findings.
Case Presentation: We report the case of a patient with a pituitary lesion who presented with hypopituitarism, diabetes insipidus, and visual field defect and was misdiagnosed as a possible cystic pituitary adenoma.
Retinal Capillary Ischemia Following Migraine: A Case Report.
Cureus
December 2024
Department of Ophthalmology, Unidade Local de Saúde de São João, Porto, PRT.
Migraine, a neurological disorder often accompanied by symptoms such as visual disturbances, nausea, and photophobia, involves complex interactions between genetic and environmental factors, while vascular factors are also implicated, influenced by both genetic predisposition and environmental triggers. This case report discusses a 41-year-old male with a history of migraine with visual aura, presenting with sudden left-eye visual loss. Comprehensive ophthalmologic examination revealed a central scotoma, while multimodal imaging, including spectral-domain optical coherence tomography (SD-OCT), showed focal alterations in the outer plexiform layer.
View Article and Find Full Text PDFLung Transplantation for Familial Diffuse Pulmonary Ossification.
Ann Thorac Surg Short Rep
September 2024
Department of Thoracic Surgery, Kyoto University Hospital, Kyoto, Japan.
We report 3 cases of extremely rare familial idiopathic diffuse pulmonary ossification, 2 of 3 received lung transplantation and the other is listed for lung transplantation. The clinical courses of family members varied greatly, and rapid deterioration could occur; therefore, early and close examination is recommended for transplant registration. During transplantation, the lungs appeared and felt exactly like a "pumice stone" and could not collapse, and good visual field was not easily obtained.
View Article and Find Full Text PDFBibliometric Analysis of Neuroinflammation and Postoperative Cognitive Dysfunction.
Brain Behav
January 2025
Department of Anesthesiology, the Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, People's Republic of China.
Background: The occurrence and development of postoperative cognitive dysfunction (POCD) are closely linked to neuroinflammation. This bibliometric analysis aims to provide novel insights into the research trajectory, key research topics, and potential future development trends in the field of neuroinflammation-induced POCD.
Methods: The Web of Science Core Collection (WoSCC) database was searched to identify publications from 2012 to 2023 on neuroinflammation-induced POCD.
Apnet: Lightweight network for apricot tree disease and pest detection in real-world complex backgrounds.
Plant Methods
January 2025
School of Electronic and Information Engineering, Liaoning Technical University, Huludao, 125105, China.
Apricot trees, serving as critical agricultural resources, hold a significant role within the agricultural domain. Conventional methods for detecting pests and diseases in these trees are notably labor-intensive. Many conditions affecting apricot trees manifest distinct visual symptoms that are ideally suited for precise identification and classification via deep learning techniques.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!