fMRI of Human Visual Pathways

2014 ◽  
pp. 267-300
Author(s):  
Edgar A. DeYoe ◽  
John L. Ulmer ◽  
Wade Mueller ◽  
Lotfi Hacein-Bey ◽  
Viktor Szeder ◽  
...  
Keyword(s):  
Visual Pathways

scholarly journals “Real-time” obstacle avoidance in the absence of primary visual cortex

2009 ◽  
Vol 106 (37) ◽  
pp. 15996-16001 ◽  
Author(s):  
Christopher L. Striemer ◽  
Craig S. Chapman ◽  
Melvyn A. Goodale
Keyword(s):  
Visual Cortex ◽  
Real Time ◽  
Obstacle Avoidance ◽  
Primary Visual Cortex ◽  
Posterior Parietal Cortex ◽  
Dorsal Stream ◽  
Visual Pathways ◽  
Visual Stream ◽  
Reaching Task ◽  
Visual Inputs

When we reach toward objects, we easily avoid potential obstacles located in the workspace. Previous studies suggest that obstacle avoidance relies on mechanisms in the dorsal visual stream in the posterior parietal cortex. One fundamental question that remains unanswered is where the visual inputs to these dorsal-stream mechanisms are coming from. Here, we provide compelling evidence that these mechanisms can operate in “real-time” without direct input from primary visual cortex (V1). In our first experiment, we used a reaching task to demonstrate that an individual with a dense left visual field hemianopia after damage to V1 remained strikingly sensitive to the position of unseen static obstacles placed in his blind field. Importantly, in a second experiment, we showed that his sensitivity to the same obstacles in his blind field was abolished when a short 2-s delay (without vision) was introduced before reach onset. These findings have far-reaching implications, not only for our understanding of the time constraints under which different visual pathways operate, but also in relation to how these seemingly “primitive” subcortical visual pathways can control complex everyday behavior without recourse to conscious vision.

scholarly journals Visual pathways in the brain of the jumping spider Marpissa muscosa

2020 ◽  
Vol 528 (11) ◽  
pp. 1883-1902
Author(s):  
Philip O. M. Steinhoff ◽  
Gabriele Uhl ◽  
Steffen Harzsch ◽  
Andy Sombke
Keyword(s):  
Visual Pathways ◽  
Jumping Spider ◽  
The Brain

Visuomotor perimetry in fish: A new approach to the functional analysis of altered visual pathways

1981 ◽  
Vol 21 (6) ◽  
pp. 843-853 ◽  
Author(s):  
D.P.M. Northmore ◽  
L.C. Skeen ◽  
J.M. Pindzola
Keyword(s):  
Functional Analysis ◽  
Visual Pathways ◽  
New Approach

Involvement of posterior visual pathways by optic nerve gliomas

1986 ◽  
Vol 16 (4) ◽  
pp. 271-274 ◽  
Author(s):  
G. L. Lourie ◽  
D. R. Osborne ◽  
D. R. Kirks
Keyword(s):  
Optic Nerve ◽  
Visual Pathways

Reading normal and degraded words: Contribution of the dorsal and ventral visual pathways

NeuroImage ◽  
2008 ◽  
Vol 40 (1) ◽  
pp. 353-366 ◽  
Author(s):  
Laurent Cohen ◽  
Stanislas Dehaene ◽  
Fabien Vinckier ◽  
Antoinette Jobert ◽  
Alexandra Montavont
Keyword(s):  
Visual Pathways

The Effects of Prior Exposure To Light On the Imprinting Process in Domestic Chicks

Behaviour ◽  
1972 ◽  
Vol 42 (3-4) ◽  
pp. 279-290 ◽  
Author(s):  
P.P.G. Bateson ◽  
Averell A.P. Wainwright
Keyword(s):  
White Light ◽  
Visual Pathways ◽  
Prior Exposure ◽  
Constant Light ◽  
Dark Control ◽  
Clear Preference ◽  
Domestic Chicks ◽  
New Apparatus ◽  
Flashing Light ◽  
First Time

AbstractDomestic chicks were placed in isolation under a constant white light for 30 minutes. Afterwards these birds and a group previously kept in the dark were trained with a Red or a Yellow flashing light for 45 minutes. Subsequently all chicks were given a choice between familiar and unfamiliar flashing lights in some new apparatus which is described in detail for the first time. The chicks exposed to constant light showed a clear preference for the flashing light with which they had been trained whereas the Dark control chicks did not. It is suggested that the constant light activated their visual pathways enabling the Light-exposed chicks to learn more than the Dark control chicks during the imprinting procedure.

Tracking mouse visual pathways with WGA transgene

2003 ◽  
Vol 18 (10) ◽  
pp. 2910-2914 ◽  
Author(s):  
Yoko Hanno ◽  
Masakiyo Nakahira ◽  
Kou-ichi Jishage ◽  
Tetsuo Noda ◽  
Yoshihiro Yoshihara
Keyword(s):  
Visual Pathways

An Unusual Phenotype in Dutch Patients With Oculocutaneous Albinism Type 4: Evident Hypopigmentation Without Other Ocular Deficits.

2021 ◽  
Author(s):  
Charlotte C Kruijt ◽  
Nicoline E Schalij-Delfos ◽  
Gerard C de Wit ◽  
Ralph F Florijn ◽  
Maria M van Genderen
Keyword(s):  
Visual Acuity ◽  
Visual Pathways ◽  
Oculocutaneous Albinism ◽  
Novel Mutations ◽  
Normal Visual Acuity ◽  
Diagnostic Center ◽  
Foveal Hypoplasia ◽  
Unusual Phenotype ◽  
First Time ◽  
Dutch Cohort

Abstract Purpose: To describe the phenotype of Dutch patients with oculocutaneous albinism type 4 (OCA4).Patients and Methods: We collected data on pigmentation (skin, hair, and eyes), visual acuity (VA), nystagmus, foveal hypoplasia, chiasmal misrouting, and molecular analyses of nine Dutch OCA4 patients from the Bartiméus Diagnostic Center for complex visual disorders.Results: All patients had severely reduced pigmentation of skin, hair, and eyes with iris transillumination over 360 degrees. Three unrelated OCA4 patients had normal VA, no nystagmus, no foveal hypoplasia, and no misrouting of the visual pathways. Six patients had poor visual acuity (0.6 to 1.0 logMAR), nystagmus, severe foveal hypoplasia and misrouting. We found two novel mutations in the SLC45A2 gene, c.310C>T; p.(Pro104Ser), and c.1368+3_1368+9del p.(?).Discussion: OCA4 patients of this Dutch cohort all had hypopigmentation of skin, hair, and iris translucency. However, patients were either severely affected with regard to visual acuity, foveal hypoplasia, and misrouting, or visually not affected at all. We describe for the first time OCA4 patients with an evident lack of pigmentation, but normal visual acuity, normal foveal development and absence of misrouting. This implies that absence of melanin does not invariably lead to foveal hypoplasia and abnormal routing of the visual pathways.

Sign in / Sign up

Export Citation Format

Share Document