Results 91 to 100 of about 2,139,976 (192)

Visuoperceptual and visuospatial alterations in neurodegenerative diseases: a narrative review

Neurology Perspectives
Introduction: There is growing evidence suggesting that alterations in higher-level visual processing are a frequent and clinically relevant symptom in such neurodegenerative diseases as Alzheimer’s disease, multiple sclerosis, and Lewy body dementia ...
Á.L. Martínez-Nogueras
doaj   +1 more source

Image complexity-based fMRI-BOLD visual network categorization across visual datasets using topological descriptors and deep-hybrid learning

Scientific Reports
This study proposes a new approach that investigates differences in topological characteristics of visual networks, which are constructed using fMRI BOLD time-series corresponding to visual datasets of COCO, ImageNet, and SUN.
Debanjali Bhattacharya, Neelam Sinha, R. Yashwanth, Amit Chattopadhyay   +3 more
doaj   +1 more source

Visual Perception and Fixation Patterns in an Individual with Ventral Simultanagnosia, Integrative Agnosia and Bilateral Visual Field Loss

Neurology International
Background/Objectives: As high-acuity vision is limited to a very small visual angle, examination of a scene requires multiple fixations. Simultanagnosia, a disorder wherein elements of a scene can be perceived correctly but cannot be integrated into a ...
Isla Williams, Andrea Phillipou, Elsdon Storey, Peter Brotchie, Larry Abel   +4 more
doaj   +1 more source

The Removal of Binocular Cues Disrupts the Calibration of Grasping in Patients with Visual Form Agnosia

, 2018
The present study tested the idea that the visuomotor systems mediating prehension do not have independent access to pictorial cues processed by perceptual mechanisms. Individuals with visual form agnosia, whose perceptual systems are compromised but who
J. J. Marotta (5426186), M. A. Goodale (5426189), Marlene Behrmann (5421509)   +2 more
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Akinetopsia: a systematic review on visual motion blindness

Frontiers in Neurology
BackgroundAkinetopsia, or visual motion blindness, is a perceptual distortion characteristic of Alice in Wonderland syndrome in which people see moving objects as disjointed ‘jumps’ or ‘freeze frames.’ Despite its profound impact, the condition remains ...
Johanna L. Browne, Lydia Krabbendam, Jan Dirk Blom, Jan Dirk Blom, Jan Dirk Blom   +4 more
doaj   +1 more source

An expedition beyond vision : What cases of visual object agnosia can teach us about the neural correlates of visual object recognition

Perceiving and recognizing objects through vision is a major part of most people’s lives. The neural mechanisms underlying these complex functions are still being researched. One avenue to explore this is through cases of visual object agnosia: a deficit
Brink, Isak, Sundling, Erik
core   +1 more source

Detecting gradual visual changes in colour and brightness agnosia: a double dissociation

, 2011
Two patients, one with colour agnosia and one with brightness agnosia, performed a task that required the detection of gradual temporal changes in colour and brightness. The results for these patients, who showed anaverage or an above-average performance
Van der Smagt, M.J., Nijboer, T.C.W., te Pas, S.F., Experimental Psychology (onderzoeksprogramma PF), Leerstoel Verstraten, Afd Psychologische Functieleer, Helmholtz Institute, Leerstoel Postma   +7 more
core  

A longitudinal study of category-specific agnosia.

, 2002
We report a 12-year longitudinal case study on a 60-year-old male patient (DW) with category-specific agnosia. The extent to which DW's impairment has changed over time was evaluated using identical tests at time 1 (1988) and time 2 (2000). In particular,
Humphreys, G. W., Graham, Kim Samantha, Forde, E. M., Thomas, R. M.   +3 more
core   +1 more source

Visual Agnosia and Prosopagnosia With or Without Achromatopsia? Case Report

, 2008
Visual stimulus coming to the primary visual cortex are processed by adjacent areas and thought inter-hemispheric pathways to allow the visual perception of objects and forms as well as recognition of faces and colours.
Joao Costa; Helena Hurbano; Ana Mendonsca
core  

[Visual agnosias]

, 1995
The conceptual framework of the present short review on visual agnosia is the symbolic approach of mental opel-ations and representations adopted in cognitive (neuro)psychology. First, usual criteria of diagnosis are critically recalled. Then, the classical theoretical conception of Lissauer is summarized.
openaire   +1 more source