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Attentional signals projecting centrifugally to the avian retina: A dual contribution to visual search
Vision Res. 2022 Feb 11;195:108016. doi: 10.1016/j.visres.2022.108016. Online ahead of print.ABSTRACTAmong vertebrates, birds have a particularly well-developed retinopetal system, i.e., the centrifugal system projecting from the brain to the retina. Primary, secondary and tertiary neurons of the retinopetal system connect serially in a one-to-one-to-one fashion, thereby assembling several thousand retinopetal modules projecting in parallel to the retina. The signal conveyed by the retinopetal system enhances the visual responses of retinal ganglion cells (RGCs), and each retinopetal module may facilitate the RGCs in a top...
Source: Vision Research - February 14, 2022 Category: Opthalmology Authors: Hiroyuki Uchiyama Hiroshi Ohno Takuto Kawasaki Yuhki Owatari Takahiro Narimatsu Yusaku Miyanagi Taiga Maeda Source Type: research
Saccades during visual search in macular degeneration
Vision Res. 2022 Aug 18;201:108113. doi: 10.1016/j.visres.2022.108113. Online ahead of print.ABSTRACTMacular degeneration (MD) compromises both high-acuity vision and eye movements when the foveal regions of both eyes are affected. Individuals with MD adapt to central field loss by adopting a preferred retinal locus (PRL) for fixation. Here, we investigate how individuals with bilateral MD use eye movements to search for targets in a visual scene under realistic binocular viewing conditions. Five individuals with binocular scotomata, 3 individuals with monocular scotomata and 6 age-matched controls participated in our stud...
Source: Vision Research - August 21, 2022 Category: Opthalmology Authors: C écile Vullings Zachary Lively Preeti Verghese Source Type: research
EEG signatures of contextual influences on visual search with real scenes.
Abstract
The use of scene context is a powerful way by which biological organisms guide and facilitate visual search. Although many studies have shown enhancements of target-related electroencephalographic activity (EEG) with synthetic cues, there have been fewer studies demonstrating such enhancements during search with scene context and objects in real world scenes. Here, observers covertly searched for a target in images of real scenes while we used EEG to measure the steady state visual evoked response to objects flickering at different frequencies. The target appeared in its typical contextual location or out...
Source: Experimental Brain Research - January 4, 2021 Category: Neuroscience Authors: Meghdadi AH, Giesbrecht B, Eckstein MP Tags: Exp Brain Res Source Type: research
Automatic segmentation of retinal layer boundaries in OCT images using multiscale convolutional neural network and graph search
Publication date: Available online 30 July 2019Source: NeurocomputingAuthor(s): Kai Hu, Binwei Shen, Yuan Zhang, Chunhong Cao, Fen Xiao, Xieping GaoAbstractAccurate quantitative analysis of the retinal layer in optical coherence tomography (OCT) images plays a crucial role in detecting and diagnosing ocular diseases. In this paper, we present a novel automatic method by combining multiscale convolutional neural network (MCNN) and graph search to accurately segment multiple retinal layer boundaries in OCT images. Firstly, we propose a MCNN architecture to extract multiscale features of retinal layer boundaries and thus to p...
Source: Neurocomputing - July 31, 2019 Category: Neuroscience Source Type: research
Automatic Anisotropic Diffusion Filtering and Graph-search Segmentation of Macular Spectral-domain Optical Coherence Tomographic (SD-OCT) Images.
CONCLUSION: Segmentation was evaluated using manually segmented B-scan by an Ophthalmologist as ground truth and accuracy was found to be 99.14 ± 0.27%.
PMID: 31989882 [PubMed - in process]
Source: Current Medical Imaging Reviews - January 30, 2020 Category: Radiology Tags: Curr Med Imaging Rev Source Type: research
Search for the Source of the Retinal Relaxing Factor.
CONCLUSIONS: the RRF is not released from vascular cells and probably neither from glial cells. The retinal cell type which does release the RRF remains unclear. Veratridine does not stimulate the RRF release in mice and the RRF release in chickens is calcium-dependent as well as calcium-independent.
PMID: 29966443 [PubMed - as supplied by publisher]
Source: Current Eye Research - July 2, 2018 Category: Opthalmology Authors: Vanden Daele L, Boydens C, Devoldere J, Remaut K, Van de Voorde J Tags: Curr Eye Res Source Type: research
